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// Copyright 2022 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// GEN_BUILD:CONDITION(tint_build_wgsl_reader)
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include "src/tint/lang/wgsl/program/program_builder.h"
#include "src/tint/lang/wgsl/reader/reader.h"
#include "src/tint/lang/wgsl/resolver/resolve.h"
#include "src/tint/lang/wgsl/resolver/uniformity.h"
#include "src/tint/utils/text/string_stream.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
namespace tint::resolver {
namespace {
using namespace tint::core::fluent_types; // NOLINT
using namespace tint::core::number_suffixes; // NOLINT
class UniformityAnalysisTestBase {
protected:
/// Build and resolve a program from a ProgramBuilder object.
/// @param program the program
/// @param should_pass true if `builder` program should pass the analysis, otherwise false
void RunTest(Program&& program, bool should_pass) {
error_ = program.Diagnostics().Str();
bool valid = program.IsValid();
if (should_pass) {
EXPECT_TRUE(valid) << error_;
EXPECT_FALSE(program.Diagnostics().ContainsErrors());
} else {
if (kUniformityFailuresAsError) {
EXPECT_FALSE(valid);
} else {
EXPECT_TRUE(valid) << error_;
}
}
}
/// Parse and resolve a WGSL shader.
/// @param src the WGSL source code
/// @param should_pass true if `src` should pass the analysis, otherwise false
void RunTest(std::string src, bool should_pass) {
wgsl::reader::Options options;
options.allowed_features = wgsl::AllowedFeatures::Everything();
auto file = std::make_unique<Source::File>("test", src);
auto program = wgsl::reader::Parse(file.get(), options);
return RunTest(std::move(program), should_pass);
}
/// Build and resolve a program from a ProgramBuilder object.
/// @param builder the program builder
/// @param should_pass true if `builder` program should pass the analysis, otherwise false
void RunTest(ProgramBuilder&& builder, bool should_pass) {
auto program = resolver::Resolve(builder);
return RunTest(std::move(program), should_pass);
}
/// The error message from the parser or resolver, if any.
std::string error_;
};
class UniformityAnalysisTest : public UniformityAnalysisTestBase, public ::testing::Test {};
class BasicTest : public UniformityAnalysisTestBase,
public ::testing::TestWithParam<std::tuple<int, int>> {
public:
/// Enum for the if-statement condition guarding a function call.
enum Condition {
// Uniform conditions:
kTrue,
kFalse,
kLiteral,
kModuleConst,
kPipelineOverridable,
kFuncLetUniformRhs,
kFuncVarUniform,
kFuncUniformRetVal,
kUniformBuffer,
kROStorageBuffer,
kLastUniformCondition = kROStorageBuffer,
// MayBeNonUniform conditions:
kFuncLetNonUniformRhs,
kFuncVarNonUniform,
kFuncNonUniformRetVal,
kRWStorageBuffer,
// End of range marker:
kEndOfConditionRange,
};
/// Enum for the function call statement.
enum Function {
// NoRestrictionFunctions:
kUserNoRestriction,
kMin,
kTextureSampleLevel,
kLastNoRestrictionFunction = kTextureSampleLevel,
// RequiredToBeUniform functions:
kUserRequiredToBeUniform,
kWorkgroupBarrier,
kStorageBarrier,
kTextureBarrier,
kWorkgroupUniformLoad,
kTextureSample,
kTextureSampleBias,
kTextureSampleCompare,
kDpdx,
kDpdxCoarse,
kDpdxFine,
kDpdy,
kDpdyCoarse,
kDpdyFine,
kFwidth,
kFwidthCoarse,
kFwidthFine,
// Subgroup functions:
kSubgroupBallot,
kSubgroupElect,
kSubgroupBroadcast,
kSubgroupBroadcastFirst,
kSubgroupShuffle,
kSubgroupShuffleXor,
kSubgroupShuffleUp,
kSubgroupShuffleDown,
kSubgroupAdd,
kSubgroupInclusiveAdd,
kSubgroupExclusiveAdd,
kSubgroupMul,
kSubgroupInclusiveMul,
kSubgroupExclusiveMul,
kSubgroupAnd,
kSubgroupOr,
kSubgroupXor,
kSubgroupMin,
kSubgroupMax,
kSubgroupAll,
kSubgroupAny,
kQuadBroadcast,
kQuadSwapX,
kQuadSwapY,
kQuadSwapDiagonal,
// End of range marker:
kEndOfFunctionRange,
};
/// Convert a condition to its string representation.
static std::string ConditionToStr(Condition c) {
switch (c) {
case kTrue:
return "true";
case kFalse:
return "false";
case kLiteral:
return "7 == 7";
case kModuleConst:
return "module_const == 0";
case kPipelineOverridable:
return "pipeline_overridable == 0";
case kFuncLetUniformRhs:
return "let_uniform_rhs == 0";
case kFuncVarUniform:
return "func_uniform == 0";
case kFuncUniformRetVal:
return "func_uniform_retval() == 0";
case kUniformBuffer:
return "u == 0";
case kROStorageBuffer:
return "ro == 0";
case kFuncLetNonUniformRhs:
return "let_nonuniform_rhs == 0";
case kFuncVarNonUniform:
return "func_non_uniform == 0";
case kFuncNonUniformRetVal:
return "func_nonuniform_retval() == 0";
case kRWStorageBuffer:
return "rw == 0";
case kEndOfConditionRange:
return "<invalid>";
}
return "<invalid>";
}
/// Convert a function call to its string representation.
static std::string FunctionCallToStr(Function f) {
switch (f) {
case kUserNoRestriction:
return "user_no_restriction()";
case kMin:
return "_ = min(1, 1)";
case kTextureSampleLevel:
return "_ = textureSampleLevel(t, s, vec2(0.5, 0.5), 0.0)";
case kUserRequiredToBeUniform:
return "user_required_to_be_uniform()";
case kWorkgroupBarrier:
return "workgroupBarrier()";
case kStorageBarrier:
return "storageBarrier()";
case kTextureBarrier:
return "textureBarrier()";
case kWorkgroupUniformLoad:
return "_ = workgroupUniformLoad(&w)";
case kTextureSample:
return "_ = textureSample(t, s, vec2(0.5, 0.5))";
case kTextureSampleBias:
return "_ = textureSampleBias(t, s, vec2(0.5, 0.5), 2.0)";
case kTextureSampleCompare:
return "_ = textureSampleCompare(td, sc, vec2(0.5, 0.5), 0.5)";
case kDpdx:
return "_ = dpdx(1.0)";
case kDpdxCoarse:
return "_ = dpdxCoarse(1.0)";
case kDpdxFine:
return "_ = dpdxFine(1.0)";
case kDpdy:
return "_ = dpdy(1.0)";
case kDpdyCoarse:
return "_ = dpdyCoarse(1.0)";
case kDpdyFine:
return "_ = dpdyFine(1.0)";
case kFwidth:
return "_ = fwidth(1.0)";
case kFwidthCoarse:
return "_ = fwidthCoarse(1.0)";
case kFwidthFine:
return "_ = fwidthFine(1.0)";
case kSubgroupBallot:
return "_ = subgroupBallot(true)";
case kSubgroupElect:
return "_ = subgroupElect()";
case kSubgroupBroadcast:
return "_ = subgroupBroadcast(1.0, 0)";
case kSubgroupBroadcastFirst:
return "_ = subgroupBroadcastFirst(1.0)";
case kSubgroupShuffle:
return "_ = subgroupShuffle(1.0, 0)";
case kSubgroupShuffleXor:
return "_ = subgroupShuffleXor(1.0, 0)";
case kSubgroupShuffleUp:
return "_ = subgroupShuffleUp(1.0, 1)";
case kSubgroupShuffleDown:
return "_ = subgroupShuffleDown(1.0, 1)";
case kSubgroupAdd:
return "_ = subgroupAdd(1.0)";
case kSubgroupInclusiveAdd:
return "_ = subgroupInclusiveAdd(1.0)";
case kSubgroupExclusiveAdd:
return "_ = subgroupExclusiveAdd(1.0)";
case kSubgroupMul:
return "_ = subgroupMul(1.0)";
case kSubgroupInclusiveMul:
return "_ = subgroupInclusiveMul(1.0)";
case kSubgroupExclusiveMul:
return "_ = subgroupExclusiveMul(1.0)";
case kSubgroupAnd:
return "_ = subgroupAnd(1)";
case kSubgroupOr:
return "_ = subgroupOr(1)";
case kSubgroupXor:
return "_ = subgroupXor(1)";
case kSubgroupMin:
return "_ = subgroupMin(1.0)";
case kSubgroupMax:
return "_ = subgroupMax(1.0)";
case kSubgroupAll:
return "_ = subgroupAll(true)";
case kSubgroupAny:
return "_ = subgroupAny(true)";
case kQuadBroadcast:
return "_ = quadBroadcast(1.0, 0)";
case kQuadSwapX:
return "_ = quadSwapX(1.0)";
case kQuadSwapY:
return "_ = quadSwapY(1.0)";
case kQuadSwapDiagonal:
return "_ = quadSwapDiagonal(1.0)";
case kEndOfFunctionRange:
return "<invalid>";
}
return "<invalid>";
}
/// @returns true if `c` is a condition that may be non-uniform.
static bool MayBeNonUniform(Condition c) { return c > kLastUniformCondition; }
/// @returns true if `f` is a function call that is required to be uniform.
static bool RequiredToBeUniform(Function f) { return f > kLastNoRestrictionFunction; }
/// Convert a test parameter pair of condition+function to a string that can be used as part of
/// a test name.
static std::string ParamsToName(::testing::TestParamInfo<ParamType> params) {
Condition c = static_cast<Condition>(std::get<0>(params.param));
Function f = static_cast<Function>(std::get<1>(params.param));
std::string name;
#define CASE(c) \
case c: \
name += #c; \
break
switch (c) {
CASE(kTrue);
CASE(kFalse);
CASE(kLiteral);
CASE(kModuleConst);
CASE(kPipelineOverridable);
CASE(kFuncLetUniformRhs);
CASE(kFuncVarUniform);
CASE(kFuncUniformRetVal);
CASE(kUniformBuffer);
CASE(kROStorageBuffer);
CASE(kFuncLetNonUniformRhs);
CASE(kFuncVarNonUniform);
CASE(kFuncNonUniformRetVal);
CASE(kRWStorageBuffer);
case kEndOfConditionRange:
break;
}
name += "_";
switch (f) {
CASE(kUserNoRestriction);
CASE(kMin);
CASE(kTextureSampleLevel);
CASE(kUserRequiredToBeUniform);
CASE(kWorkgroupBarrier);
CASE(kStorageBarrier);
CASE(kTextureBarrier);
CASE(kWorkgroupUniformLoad);
CASE(kTextureSample);
CASE(kTextureSampleBias);
CASE(kTextureSampleCompare);
CASE(kDpdx);
CASE(kDpdxCoarse);
CASE(kDpdxFine);
CASE(kDpdy);
CASE(kDpdyCoarse);
CASE(kDpdyFine);
CASE(kFwidth);
CASE(kFwidthCoarse);
CASE(kFwidthFine);
CASE(kSubgroupBallot);
CASE(kSubgroupElect);
CASE(kSubgroupBroadcast);
CASE(kSubgroupBroadcastFirst);
CASE(kSubgroupShuffle);
CASE(kSubgroupShuffleXor);
CASE(kSubgroupShuffleUp);
CASE(kSubgroupShuffleDown);
CASE(kSubgroupAdd);
CASE(kSubgroupInclusiveAdd);
CASE(kSubgroupExclusiveAdd);
CASE(kSubgroupMul);
CASE(kSubgroupInclusiveMul);
CASE(kSubgroupExclusiveMul);
CASE(kSubgroupAnd);
CASE(kSubgroupOr);
CASE(kSubgroupXor);
CASE(kSubgroupMin);
CASE(kSubgroupMax);
CASE(kSubgroupAll);
CASE(kSubgroupAny);
CASE(kQuadBroadcast);
CASE(kQuadSwapX);
CASE(kQuadSwapY);
CASE(kQuadSwapDiagonal);
case kEndOfFunctionRange:
break;
}
#undef CASE
return name;
}
};
// Test the uniformity constraints for a function call inside a conditional statement.
TEST_P(BasicTest, ConditionalFunctionCall) {
auto condition = static_cast<Condition>(std::get<0>(GetParam()));
auto function = static_cast<Function>(std::get<1>(GetParam()));
std::string src = R"(
enable subgroups;
var<private> p : i32;
var<workgroup> w : i32;
@group(0) @binding(0) var<uniform> u : i32;
@group(0) @binding(0) var<storage, read> ro : i32;
@group(0) @binding(0) var<storage, read_write> rw : i32;
@group(1) @binding(0) var t : texture_2d<f32>;
@group(1) @binding(1) var td : texture_depth_2d;
@group(1) @binding(2) var s : sampler;
@group(1) @binding(3) var sc : sampler_comparison;
const module_const : i32 = 42;
@id(42) override pipeline_overridable : i32;
fn user_no_restriction() {}
fn user_required_to_be_uniform() { workgroupBarrier(); }
fn func_uniform_retval() -> i32 { return u; }
fn func_nonuniform_retval() -> i32 { return rw; }
fn foo() {
let let_uniform_rhs = 7;
let let_nonuniform_rhs = rw;
var func_uniform = 7;
var func_non_uniform = 7;
func_non_uniform = rw;
if ()" + ConditionToStr(condition) +
R"() {
)" + FunctionCallToStr(function) +
R"(;
}
}
)";
bool should_pass = !(MayBeNonUniform(condition) && RequiredToBeUniform(function));
RunTest(src, should_pass);
if (!should_pass) {
EXPECT_THAT(error_, ::testing::HasSubstr("must only be called from uniform control flow"));
}
}
INSTANTIATE_TEST_SUITE_P(
UniformityAnalysisTest,
BasicTest,
::testing::Combine(::testing::Range<int>(0, BasicTest::kEndOfConditionRange),
::testing::Range<int>(0, BasicTest::kEndOfFunctionRange)),
BasicTest::ParamsToName);
////////////////////////////////////////////////////////////////////////////////
/// Test specific function and parameter tags that are not tested above.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, ParameterNoRestriction_Pass) {
// Pass a non-uniform value as an argument, and then try to use the return value for
// control-flow guarding a barrier.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
var<private> p : i32;
fn foo(i : i32) -> i32 {
if (i == 0) {
// This assignment is non-uniform, but shouldn't affect the return value.
p = 42;
}
return 7;
}
fn bar() {
let x = foo(rw);
if (x == 7) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ParameterRequiredToBeUniform_Pass) {
// Pass a uniform value as an argument to a function that uses that parameter for control-flow
// guarding a barrier.
std::string src = R"(
@group(0) @binding(0) var<storage, read> ro : i32;
fn foo(i : i32) {
if (i == 0) {
workgroupBarrier();
}
}
fn bar() {
foo(ro);
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ParameterRequiredToBeUniform_Fail) {
// Pass a non-uniform value as an argument to a function that uses that parameter for
// control-flow guarding a barrier.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo(i : i32) {
if (i == 0) {
workgroupBarrier();
}
}
fn bar() {
foo(rw);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (i == 0) {
^^
test:4:8 note: parameter 'i' of 'foo' may be non-uniform
fn foo(i : i32) {
^
test:11:7 note: possibly non-uniform value passed here
foo(rw);
^^
test:11:7 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
foo(rw);
^^
)");
}
TEST_F(UniformityAnalysisTest, ParameterRequiredToBeUniformForReturnValue_Pass) {
// Pass a uniform value as an argument to a function that uses that parameter to produce the
// return value, and then use the return value for control-flow guarding a barrier.
std::string src = R"(
@group(0) @binding(0) var<storage, read> ro : i32;
fn foo(i : i32) -> i32 {
return 1 + i;
}
fn bar() {
if (foo(ro) == 7) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ParameterRequiredToBeUniformForReturnValue_Fail) {
// Pass a non-uniform value as an argument to a function that uses that parameter to produce the
// return value, and then use the return value for control-flow guarding a barrier.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo(i : i32) -> i32 {
return 1 + i;
}
fn bar() {
if (foo(rw) == 7) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (foo(rw) == 7) {
^^
test:9:11 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
if (foo(rw) == 7) {
^^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// Test shader IO attributes.
////////////////////////////////////////////////////////////////////////////////
struct BuiltinEntry {
std::string name;
std::string type;
bool uniform;
BuiltinEntry(std::string n, std::string t, bool u) : name(n), type(t), uniform(u) {}
};
class ComputeBuiltin : public UniformityAnalysisTestBase,
public ::testing::TestWithParam<BuiltinEntry> {};
TEST_P(ComputeBuiltin, AsParam) {
std::string src = std::string((GetParam().name == "subgroup_size")
? R"(enable chromium_experimental_subgroups;
)"
: "") +
R"(
@compute @workgroup_size(64)
fn main(@builtin()" + GetParam().name +
R"() b : )" + GetParam().type + R"() {
if (all(vec3(b) == vec3(0u))) {
workgroupBarrier();
}
}
)";
bool should_pass = GetParam().uniform;
RunTest(src, should_pass);
if (!should_pass) {
EXPECT_EQ(
error_,
R"(test:5:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:4:3 note: control flow depends on possibly non-uniform value
if (all(vec3(b) == vec3(0u))) {
^^
test:4:16 note: builtin 'b' of 'main' may be non-uniform
if (all(vec3(b) == vec3(0u))) {
^
)");
}
}
TEST_P(ComputeBuiltin, InStruct) {
std::string src = std::string((GetParam().name == "subgroup_size")
? R"(enable chromium_experimental_subgroups;
)"
: "") +
R"(
struct S {
@builtin()" + GetParam().name +
R"() b : )" + GetParam().type + R"(
}
@compute @workgroup_size(64)
fn main(s : S) {
if (all(vec3(s.b) == vec3(0u))) {
workgroupBarrier();
}
}
)";
bool should_pass = GetParam().uniform;
RunTest(src, should_pass);
if (!should_pass) {
EXPECT_EQ(
error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (all(vec3(s.b) == vec3(0u))) {
^^
test:8:16 note: parameter 's' of 'main' may be non-uniform
if (all(vec3(s.b) == vec3(0u))) {
^
)");
}
}
INSTANTIATE_TEST_SUITE_P(UniformityAnalysisTest,
ComputeBuiltin,
::testing::Values(BuiltinEntry{"local_invocation_id", "vec3<u32>", false},
BuiltinEntry{"local_invocation_index", "u32", false},
BuiltinEntry{"global_invocation_id", "vec3<u32>", false},
BuiltinEntry{"workgroup_id", "vec3<u32>", true},
BuiltinEntry{"num_workgroups", "vec3<u32>", true},
BuiltinEntry{"subgroup_size", "u32", true}),
[](const ::testing::TestParamInfo<ComputeBuiltin::ParamType>& p) {
return p.param.name;
});
TEST_F(UniformityAnalysisTest, ComputeBuiltin_MixedAttributesInStruct) {
// Mix both non-uniform and uniform shader IO attributes in the same structure. Even accessing
// just uniform member causes non-uniformity in this case.
std::string src = R"(
struct S {
@builtin(num_workgroups) num_groups : vec3<u32>,
@builtin(local_invocation_index) idx : u32,
}
@compute @workgroup_size(64)
fn main(s : S) {
if (s.num_groups.x == 0u) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (s.num_groups.x == 0u) {
^^
test:9:7 note: parameter 's' of 'main' may be non-uniform
if (s.num_groups.x == 0u) {
^
)");
}
class FragmentBuiltin : public UniformityAnalysisTestBase,
public ::testing::TestWithParam<BuiltinEntry> {};
TEST_P(FragmentBuiltin, AsParam) {
std::string src = std::string((GetParam().name == "subgroup_size")
? R"(enable chromium_experimental_subgroups;
)"
: R"(
)") +
R"(
@fragment
fn main(@builtin()" + GetParam().name +
R"() b : )" + GetParam().type + R"() {
if (u32(vec4(b).x) == 0u) {
_ = dpdx(0.5);
}
}
)";
bool should_pass = GetParam().uniform;
RunTest(src, should_pass);
if (!should_pass) {
EXPECT_EQ(error_,
R"(test:6:9 error: 'dpdx' must only be called from uniform control flow
_ = dpdx(0.5);
^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (u32(vec4(b).x) == 0u) {
^^
test:5:16 note: builtin 'b' of 'main' may be non-uniform
if (u32(vec4(b).x) == 0u) {
^
)");
}
}
TEST_P(FragmentBuiltin, InStruct) {
std::string src = std::string((GetParam().name == "subgroup_size")
? R"(enable chromium_experimental_subgroups;
)"
: R"(
)") +
R"(
struct S {
@builtin()" + GetParam().name +
R"() b : )" + GetParam().type + R"(
}
@fragment
fn main(s : S) {
if (u32(vec4(s.b).x) == 0u) {
_ = dpdx(0.5);
}
}
)";
bool should_pass = GetParam().uniform;
RunTest(src, should_pass);
if (!should_pass) {
EXPECT_EQ(error_,
R"(test:10:9 error: 'dpdx' must only be called from uniform control flow
_ = dpdx(0.5);
^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (u32(vec4(s.b).x) == 0u) {
^^
test:9:16 note: parameter 's' of 'main' may be non-uniform
if (u32(vec4(s.b).x) == 0u) {
^
)");
}
}
INSTANTIATE_TEST_SUITE_P(UniformityAnalysisTest,
FragmentBuiltin,
::testing::Values(BuiltinEntry{"position", "vec4<f32>", false},
BuiltinEntry{"front_facing", "bool", false},
BuiltinEntry{"sample_index", "u32", false},
BuiltinEntry{"sample_mask", "u32", false},
BuiltinEntry{"subgroup_size", "u32", false}),
[](const ::testing::TestParamInfo<FragmentBuiltin::ParamType>& p) {
return p.param.name;
});
TEST_F(UniformityAnalysisTest, FragmentLocation) {
std::string src = R"(
@fragment
fn main(@location(0) l : f32) {
if (l == 0.0) {
_ = dpdx(0.5);
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:5:9 error: 'dpdx' must only be called from uniform control flow
_ = dpdx(0.5);
^^^^^^^^^
test:4:3 note: control flow depends on possibly non-uniform value
if (l == 0.0) {
^^
test:4:7 note: user-defined input 'l' of 'main' may be non-uniform
if (l == 0.0) {
^
)");
}
TEST_F(UniformityAnalysisTest, FragmentLocation_InStruct) {
std::string src = R"(
struct S {
@location(0) l : f32
}
@fragment
fn main(s : S) {
if (s.l == 0.0) {
_ = dpdx(0.5);
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:9 error: 'dpdx' must only be called from uniform control flow
_ = dpdx(0.5);
^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (s.l == 0.0) {
^^
test:8:7 note: parameter 's' of 'main' may be non-uniform
if (s.l == 0.0) {
^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// Test loop conditions and conditional break/continue statements.
////////////////////////////////////////////////////////////////////////////////
namespace LoopTest {
enum ControlFlowInterrupt {
kBreak,
kContinue,
kReturn,
};
enum Condition {
kNone,
kUniform,
kNonUniform,
};
using LoopTestParams = std::tuple<int, int>;
static std::string ToStr(ControlFlowInterrupt interrupt) {
switch (interrupt) {
case kBreak:
return "break";
case kContinue:
return "continue";
case kReturn:
return "return";
}
return "";
}
static std::string ToStr(Condition condition) {
switch (condition) {
case kNone:
return "uncondtiional";
case kUniform:
return "uniform";
case kNonUniform:
return "nonuniform";
}
return "";
}
class LoopTest : public UniformityAnalysisTestBase,
public ::testing::TestWithParam<LoopTestParams> {
protected:
std::string MakeInterrupt(ControlFlowInterrupt interrupt, Condition condition) {
switch (condition) {
case kNone:
return ToStr(interrupt);
case kUniform:
return "if (uniform_var == 42) { " + ToStr(interrupt) + "; }";
case kNonUniform:
return "if (nonuniform_var == 42) { " + ToStr(interrupt) + "; }";
}
return "<invalid>";
}
};
INSTANTIATE_TEST_SUITE_P(UniformityAnalysisTest,
LoopTest,
::testing::Combine(::testing::Range<int>(0, kReturn + 1),
::testing::Range<int>(0, kNonUniform + 1)),
[](const ::testing::TestParamInfo<LoopTestParams>& p) {
ControlFlowInterrupt interrupt =
static_cast<ControlFlowInterrupt>(std::get<0>(p.param));
auto condition = static_cast<Condition>(std::get<1>(p.param));
return ToStr(interrupt) + "_" + ToStr(condition);
});
TEST_P(LoopTest, CallInBody_InterruptAfter) {
// Test control-flow interrupt in a loop after a function call that requires uniform control
// flow.
auto interrupt = static_cast<ControlFlowInterrupt>(std::get<0>(GetParam()));
auto condition = static_cast<Condition>(std::get<1>(GetParam()));
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_var : i32;
@group(0) @binding(0) var<storage, read_write> nonuniform_var : i32;
fn foo() {
loop {
// Pretend that this isn't an infinite loop, in case the interrupt is a
// continue statement.
if (false) {
break;
}
workgroupBarrier();
)" + MakeInterrupt(interrupt, condition) +
R"(;
}
}
)";
if (condition == kNonUniform) {
RunTest(src, false);
EXPECT_THAT(
error_,
::testing::StartsWith(
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();)"));
EXPECT_THAT(error_,
::testing::HasSubstr("test:14:9 note: reading from read_write storage buffer "
"'nonuniform_var' may result in a non-uniform value"));
} else {
RunTest(src, true);
}
}
TEST_P(LoopTest, CallInBody_InterruptBefore) {
// Test control-flow interrupt in a loop before a function call that requires uniform control
// flow.
auto interrupt = static_cast<ControlFlowInterrupt>(std::get<0>(GetParam()));
auto condition = static_cast<Condition>(std::get<1>(GetParam()));
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_var : i32;
@group(0) @binding(0) var<storage, read_write> nonuniform_var : i32;
fn foo() {
loop {
// Pretend that this isn't an infinite loop, in case the interrupt is a
// continue statement.
if (false) {
break;
}
)" + MakeInterrupt(interrupt, condition) +
R"(;
workgroupBarrier();
}
}
)";
if (condition == kNonUniform) {
RunTest(src, false);
EXPECT_THAT(
error_,
::testing::StartsWith(
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();)"));
EXPECT_THAT(error_,
::testing::HasSubstr("test:13:9 note: reading from read_write storage buffer "
"'nonuniform_var' may result in a non-uniform value"));
} else {
RunTest(src, true);
}
}
TEST_P(LoopTest, CallInContinuing_InterruptInBody) {
// Test control-flow interrupt in a loop with a function call that requires uniform control flow
// in the continuing statement.
auto interrupt = static_cast<ControlFlowInterrupt>(std::get<0>(GetParam()));
auto condition = static_cast<Condition>(std::get<1>(GetParam()));
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_var : i32;
@group(0) @binding(0) var<storage, read_write> nonuniform_var : i32;
fn foo() {
loop {
// Pretend that this isn't an infinite loop, in case the interrupt is a
// continue statement.
if (false) {
break;
}
)" + MakeInterrupt(interrupt, condition) +
R"(;
continuing {
workgroupBarrier();
}
}
}
)";
if (condition == kNonUniform) {
RunTest(src, false);
EXPECT_THAT(
error_,
::testing::StartsWith(
R"(test:15:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();)"));
EXPECT_THAT(error_,
::testing::HasSubstr("test:13:9 note: reading from read_write storage buffer "
"'nonuniform_var' may result in a non-uniform value"));
} else {
RunTest(src, true);
}
}
TEST_F(UniformityAnalysisTest, Loop_CallInBody_UniformBreakInContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> n : i32;
fn foo() {
var i = 0;
loop {
workgroupBarrier();
continuing {
i = i + 1;
break if (i == n);
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_CallInBody_NonUniformBreakInContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
var i = 0;
loop {
workgroupBarrier();
continuing {
i = i + 1;
break if (i == n);
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:7 note: control flow depends on possibly non-uniform value
break if (i == n);
^^^^^
test:10:22 note: reading from read_write storage buffer 'n' may result in a non-uniform value
break if (i == n);
^
)");
}
TEST_F(UniformityAnalysisTest, Loop_CallInContinuing_UniformBreakInContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> n : i32;
fn foo() {
var i = 0;
loop {
continuing {
workgroupBarrier();
i = i + 1;
break if (i == n);
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_CallInContinuing_NonUniformBreakInContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
var i = 0;
loop {
continuing {
workgroupBarrier();
i = i + 1;
break if (i == n);
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:7 note: control flow depends on possibly non-uniform value
break if (i == n);
^^^^^
test:10:22 note: reading from read_write storage buffer 'n' may result in a non-uniform value
break if (i == n);
^
)");
}
class LoopDeadCodeTest : public UniformityAnalysisTestBase, public ::testing::TestWithParam<int> {};
INSTANTIATE_TEST_SUITE_P(UniformityAnalysisTest,
LoopDeadCodeTest,
::testing::Range<int>(0, kReturn + 1),
[](const ::testing::TestParamInfo<LoopDeadCodeTest::ParamType>& p) {
return ToStr(static_cast<ControlFlowInterrupt>(p.param));
});
TEST_P(LoopDeadCodeTest, AfterInterrupt) {
// Dead code after a control-flow interrupt in a loop shouldn't cause uniformity errors.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
loop {
)" + ToStr(static_cast<ControlFlowInterrupt>(GetParam())) +
R"(;
if (n == 42) {
workgroupBarrier();
}
continuing {
// Pretend that this isn't an infinite loop, in case the interrupt is a
// continue statement.
break if (false);
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesNonUniformInLoopAfterBarrier) {
// Use a variable for a conditional barrier in a loop, and then assign a non-uniform value to
// that variable later in that loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesNonUniformInLoopAfterBarrier_BreakAtEnd) {
// Use a variable for a conditional barrier in a loop, and then assign a non-uniform value to
// that variable later in that loop. End the loop with a break statement to prevent the
// non-uniform value from causing an issue.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (v == 0) {
workgroupBarrier();
}
v = non_uniform;
break;
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_ConditionalAssignNonUniformWithBreak_BarrierInLoop) {
// In a conditional block, assign a non-uniform value and then break, then use a variable for a
// conditional barrier later in the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (true) {
v = non_uniform;
break;
}
if (v == 0) {
workgroupBarrier();
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_ConditionalAssignNonUniformWithConditionalBreak_BarrierInLoop) {
// In a conditional block, assign a non-uniform value and then conditionally break, then use a
// variable for a conditional barrier later in the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (true) {
v = non_uniform;
if (true) {
break;
}
}
if (v == 0) {
workgroupBarrier();
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:8:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_ConditionalAssignNonUniformWithBreak_BarrierAfterLoop) {
// In a conditional block, assign a non-uniform value and then break, then use a variable for a
// conditional barrier after the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (true) {
v = non_uniform;
break;
}
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:15:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:8:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesUniformBeforeSomeExits_BarrierAfterLoop) {
// Assign a non-uniform value, have two exit points only one of which assigns a uniform value,
// then use a variable for a conditional barrier after the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (true) {
break;
}
v = non_uniform;
if (false) {
v = 6;
break;
}
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:20:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:19:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:11:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesUniformBeforeAllExits_BarrierAfterLoop) {
// Assign a non-uniform value, have two exit points both of which assigns a uniform value,
// then use a variable for a conditional barrier after the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (true) {
v = 5;
break;
}
v = non_uniform;
if (false) {
v = 6;
break;
}
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_AssignNonUniformBeforeConditionalBreak_BarrierAfterLoop) {
// Assign a non-uniform value and then break in a conditional block, then use a variable for a
// conditional barrier after the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
v = non_uniform;
if (true) {
if (false) {
v = 5;
} else {
break;
}
v = 5;
}
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:20:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:19:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:7:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesNonUniformBeforeConditionalContinue_BarrierAtStart) {
// Use a variable for a conditional barrier in a loop, assign a non-uniform value to
// that variable later in that loop, then perform a conditional continue before assigning a
// uniform value to that variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
if (true) {
continue;
}
v = 5;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
Loop_VarBecomesUniformBeforeConditionalContinue_BarrierInContinuing) {
// Use a variable for a conditional barrier in the continuing statement of a loop, assign a
// non-uniform value to that variable later in that loop, then conditionally assign a uniform
// value before continuing.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
v = non_uniform;
if (false) {
v = 5;
continue;
}
continuing {
if (v == 0) {
workgroupBarrier();
}
break if (true);
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:9 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:7 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:7:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesNonUniformBeforeConditionalContinue) {
// Use a variable for a conditional barrier in a loop, assign a non-uniform value to
// that variable later in that loop, then perform a conditional continue before assigning a
// uniform value to that variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
if (true) {
continue;
}
v = 5;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_VarBecomesNonUniformInNestedLoopWithBreak_BarrierInLoop) {
// Use a variable for a conditional barrier in a loop, then conditionally assign a non-uniform
// value to that variable followed by a break in a nested loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (v == 0) {
workgroupBarrier();
break;
}
loop {
if (true) {
v = non_uniform;
break;
}
v = 5;
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:14:13 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
Loop_VarBecomesNonUniformInNestedLoopWithBreak_BecomesUniformAgain_BarrierAfterLoop) {
// Conditionally assign a non-uniform value followed by a break in a nested loop, assign a
// uniform value in the outer loop, and then use a variable for a conditional barrier after the
// loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
loop {
if (false) {
break;
}
loop {
if (true) {
v = non_uniform;
break;
}
}
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_NonUniformValueNeverReachesContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
loop {
var v = non_uniform;
return;
continuing {
if (v == 0) {
workgroupBarrier();
}
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_NonUniformValueDeclaredInBody_UnreachableContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var condition = true;
loop {
var v = non_uniform;
if (condition) {
break;
} else {
break;
}
continuing {
if (v == 0) {
workgroupBarrier();
}
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_NonUniformValueDeclaredInBody_MaybeReachesContinuing) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var condition = true;
loop {
var v = non_uniform;
if (condition) {
continue;
} else {
break;
}
continuing {
if (v == 0) {
workgroupBarrier();
}
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:9 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:7 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:7:13 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Loop_NonUniformBreakInBody_Reconverge) {
// Loops reconverge at exit, so test that we can call workgroupBarrier() after a loop that
// contains a non-uniform conditional break.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
var i = 0;
loop {
if (i == n) {
break;
}
i = i + 1;
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_CallInside_UniformCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> n : i32;
fn foo() {
for (var i = 0; i < n; i = i + 1) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_CallInside_NonUniformCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
for (var i = 0; i < n; i = i + 1) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
for (var i = 0; i < n; i = i + 1) {
^^^
test:5:23 note: reading from read_write storage buffer 'n' may result in a non-uniform value
for (var i = 0; i < n; i = i + 1) {
^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_VarBecomesNonUniformInContinuing_BarrierInLoop) {
// Use a variable for a conditional barrier in a loop, and then assign a non-uniform value to
// that variable in the continuing statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; v = non_uniform) {
if (v == 0) {
workgroupBarrier();
break;
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:31 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
for (var i = 0; i < 10; v = non_uniform) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_VarBecomesUniformInContinuing_BarrierInLoop) {
// Use a variable for a conditional barrier in a loop, and then assign a uniform value to that
// variable in the continuing statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; v = 5) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_VarBecomesNonUniformInContinuing_BarrierAfterLoop) {
// Use a variable for a conditional barrier after a loop, and assign a non-uniform value to
// that variable in the continuing statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; v = non_uniform) {
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:31 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
for (var i = 0; i < 10; v = non_uniform) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_VarBecomesUniformInContinuing_BarrierAfterLoop) {
// Use a variable for a conditional barrier after a loop, and assign a uniform value to that
// variable in the continuing statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; v = 5) {
v = non_uniform;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_VarBecomesNonUniformInLoopAfterBarrier) {
// Use a variable for a conditional barrier in a loop, and then assign a non-uniform value to
// that variable later in that loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; i++) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_ConditionalAssignNonUniformWithBreak_BarrierInLoop) {
// In a conditional block, assign a non-uniform value and then break, then use a variable for a
// conditional barrier later in the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; i++) {
if (true) {
v = non_uniform;
break;
}
if (v == 0) {
workgroupBarrier();
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_ConditionalAssignNonUniformWithBreak_BarrierAfterLoop) {
// In a conditional block, assign a non-uniform value and then break, then use a variable for a
// conditional barrier after the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; i++) {
if (true) {
v = non_uniform;
break;
}
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:15:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:8:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_VarRemainsNonUniformAtLoopEnd_BarrierAfterLoop) {
// Assign a non-uniform value, assign a uniform value before all explicit break points but leave
// the value non-uniform at loop exit, then use a variable for a conditional barrier after the
// loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; i++) {
if (true) {
v = 5;
break;
}
v = non_uniform;
if (true) {
v = 6;
break;
}
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:21:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:20:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ForLoop_VarBecomesNonUniformBeforeConditionalContinue_BarrierAtStart) {
// Use a variable for a conditional barrier in a loop, assign a non-uniform value to
// that variable later in that loop, then perform a conditional continue before assigning a
// uniform value to that variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; i++) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
if (true) {
continue;
}
v = 5;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_VarBecomesNonUniformBeforeConditionalContinue) {
// Use a variable for a conditional barrier in a loop, assign a non-uniform value to
// that variable later in that loop, then perform a conditional continue before assigning a
// uniform value to that variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
for (var i = 0; i < 10; i++) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
if (true) {
continue;
}
v = 5;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ForLoop_InitializerVarBecomesNonUniformBeforeConditionalContinue_BarrierAtStart) {
// Use a variable declared in a for-loop initializer for a conditional barrier in a loop, assign
// a non-uniform value to that variable later in that loop and then execute a continue.
// Tests that variables declared in the for-loop initializer are properly tracked.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
for (var i = 0; i < 10; i++) {
if (i < 5) {
workgroupBarrier();
}
if (true) {
i = non_uniform;
continue;
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
for (var i = 0; i < 10; i++) {
^^^
test:10:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
i = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_NonUniformCondition_Reconverge) {
// Loops reconverge at exit, so test that we can call workgroupBarrier() after a loop that has a
// non-uniform condition.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
for (var i = 0; i < n; i = i + 1) {
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_VarDeclaredInBody) {
// Make sure that we can declare a variable inside the loop body without causing issues for
// tracking local variables across iterations.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
var outer : i32;
for (var i = 0; i < n; i = i + 1) {
var inner : i32;
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ForLoop_InitializerScope) {
// Make sure that variables declared in a for-loop initializer are properly removed from the
// local variable list, otherwise a parent control-flow statement will try to add edges to nodes
// that no longer exist.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
if (n == 5) {
for (var i = 0; i < n; i = i + 1) {
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, While_CallInside_UniformCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> n : i32;
fn foo() {
var i = 0;
while (i < n) {
workgroupBarrier();
i = i + 1;
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, While_CallInside_NonUniformCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
var i = 0;
while (i < n) {
workgroupBarrier();
i = i + 1;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
while (i < n) {
^^^^^
test:6:14 note: reading from read_write storage buffer 'n' may result in a non-uniform value
while (i < n) {
^
)");
}
TEST_F(UniformityAnalysisTest, While_VarBecomesNonUniformInLoopAfterBarrier) {
// Use a variable for a conditional barrier in a loop, and then assign a non-uniform value to
// that variable later in that loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
var i = 0;
while (i < 10) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
i++;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:13:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, While_ConditionalAssignNonUniformWithBreak_BarrierInLoop) {
// In a conditional block, assign a non-uniform value and then break, then use a variable for a
// conditional barrier later in the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
var i = 0;
while (i < 10) {
if (true) {
v = non_uniform;
break;
}
if (v == 0) {
workgroupBarrier();
}
i++;
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, While_ConditionalAssignNonUniformWithBreak_BarrierAfterLoop) {
// In a conditional block, assign a non-uniform value and then break, then use a variable for a
// conditional barrier after the loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
var i = 0;
while (i < 10) {
if (true) {
v = non_uniform;
break;
}
v = 5;
i++;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:17:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:16:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:9:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, While_VarRemainsNonUniformAtLoopEnd_BarrierAfterLoop) {
// Assign a non-uniform value, assign a uniform value before all explicit break points but leave
// the value non-uniform at loop exit, then use a variable for a conditional barrier after the
// loop.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
var i = 0;
while (i < 10) {
if (true) {
v = 5;
break;
}
v = non_uniform;
if (true) {
v = 6;
break;
}
i++;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:23:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:22:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:13:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, While_VarBecomesNonUniformBeforeConditionalContinue_BarrierAtStart) {
// Use a variable for a conditional barrier in a loop, assign a non-uniform value to
// that variable later in that loop, then perform a conditional continue before assigning a
// uniform value to that variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
var i = 0;
while (i < 10) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
if (true) {
continue;
}
v = 5;
i++;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:13:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, While_VarBecomesNonUniformBeforeConditionalContinue) {
// Use a variable for a conditional barrier in a loop, assign a non-uniform value to
// that variable later in that loop, then perform a conditional continue before assigning a
// uniform value to that variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
var i = 0;
while (i < 10) {
if (v == 0) {
workgroupBarrier();
break;
}
v = non_uniform;
if (true) {
continue;
}
v = 5;
i++;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:5 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:13:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, While_NonUniformCondition_Reconverge) {
// Loops reconverge at exit, so test that we can call workgroupBarrier() after a loop that has a
// non-uniform condition.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn foo() {
var i = 0;
while (i < n) {
}
workgroupBarrier();
i = i + 1;
}
)";
RunTest(src, true);
}
} // namespace LoopTest
////////////////////////////////////////////////////////////////////////////////
/// If-else statement tests.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, IfElse_UniformCondition_BarrierInTrueBlock) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_global : i32;
fn foo() {
if (uniform_global == 42) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_UniformCondition_BarrierInElseBlock) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_global : i32;
fn foo() {
if (uniform_global == 42) {
} else {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_UniformCondition_BarrierInElseIfBlock) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_global : i32;
fn foo() {
if (uniform_global == 42) {
} else if (true) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_NonUniformCondition_BarrierInTrueBlock) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_NonUniformCondition_BarrierInElseBlock) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
} else {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_ShortCircuitingCondition_NonUniformLHS_And) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
var<private> p : i32;
fn main() {
if ((non_uniform_global == 42) && false) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:7 note: control flow depends on possibly non-uniform value
if ((non_uniform_global == 42) && false) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
test:7:8 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if ((non_uniform_global == 42) && false) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_ShortCircuitingCondition_NonUniformRHS_And) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
var<private> p : i32;
fn main() {
if (false && (non_uniform_global == 42)) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (false && (non_uniform_global == 42)) {
^^
test:7:17 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (false && (non_uniform_global == 42)) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_ShortCircuitingCondition_NonUniformLHS_Or) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
var<private> p : i32;
fn main() {
if ((non_uniform_global == 42) || true) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:7 note: control flow depends on possibly non-uniform value
if ((non_uniform_global == 42) || true) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
test:7:8 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if ((non_uniform_global == 42) || true) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_ShortCircuitingCondition_NonUniformRHS_Or) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
var<private> p : i32;
fn main() {
if (true || (non_uniform_global == 42)) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (true || (non_uniform_global == 42)) {
^^
test:7:16 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (true || (non_uniform_global == 42)) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_NonUniformCondition_BarrierInElseIfBlock) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
} else if (true) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_VarBecomesNonUniform_BeforeCondition) {
// Use a function-scope variable for control-flow guarding a barrier, and then assign to that
// variable before checking the condition.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v = 0;
v = rw;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:7 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_VarBecomesNonUniform_AfterCondition) {
// Use a function-scope variable for control-flow guarding a barrier, and then assign to that
// variable after checking the condition.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v = 0;
if (v == 0) {
v = rw;
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_VarBecomesNonUniformInIf_BarrierInElse) {
// Assign a non-uniform value to a variable in an if-block, and then use that variable for a
// conditional barrier in the else block.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
if (true) {
v = non_uniform;
} else {
if (v == 0) {
workgroupBarrier();
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_AssignNonUniformInIf_AssignUniformInElse) {
// Assign a non-uniform value to a variable in an if-block and a uniform value in the else
// block, and then use that variable for a conditional barrier after the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
if (true) {
if (true) {
v = non_uniform;
} else {
v = 5;
}
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:15:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:8:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_AssignNonUniformInIfWithReturn) {
// Assign a non-uniform value to a variable in an if-block followed by a return, and then use
// that variable for a conditional barrier after the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
if (true) {
v = non_uniform;
return;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_AssignNonUniformBeforeIf_BothBranchesAssignUniform) {
// Assign a non-uniform value to a variable before and if-else statement, assign uniform values
// in both branch of the if-else, and then use that variable for a conditional barrier after
// the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
v = non_uniform;
if (true) {
v = 5;
} else {
v = 6;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_AssignNonUniformBeforeIf_OnlyTrueBranchAssignsUniform) {
// Assign a non-uniform value to a variable before and if-else statement, assign a uniform value
// in the true branch of the if-else, and then use that variable for a conditional barrier after
// the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
v = non_uniform;
if (true) {
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:12:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, IfElse_AssignNonUniformBeforeIf_OnlyFalseBranchAssignsUniform) {
// Assign a non-uniform value to a variable before and if-else statement, assign a uniform value
// in the false branch of the if-else, and then use that variable for a conditional barrier
// after the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
v = non_uniform;
if (true) {
} else {
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
IfElse_AssignNonUniformBeforeIf_OnlyTrueBranchAssignsUniform_FalseBranchReturns) {
// Assign a non-uniform value to a variable before and if-else statement, assign a uniform value
// in the true branch of the if-else, leave the variable untouched in the false branch and just
// return, and then use that variable for a conditional barrier after the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
v = non_uniform;
if (true) {
v = 5;
} else {
return;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
IfElse_AssignNonUniformBeforeIf_OnlyFalseBranchAssignsUniform_TrueBranchReturns) {
// Assign a non-uniform value to a variable before and if-else statement, assign a uniform value
// in the false branch of the if-else, leave the variable untouched in the true branch and just
// return, and then use that variable for a conditional barrier after the if-else statement.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
v = non_uniform;
if (true) {
return;
} else {
v = 5;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_NonUniformCondition_Reconverge) {
// If statements reconverge at exit, so test that we can call workgroupBarrier() after an if
// statement with a non-uniform condition.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
} else {
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_ShortCircuitingNonUniformConditionLHS_Reconverge) {
// If statements reconverge at exit, so test that we can call workgroupBarrier() after an if
// statement with a non-uniform condition that uses short-circuiting.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42 || true) {
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_ShortCircuitingNonUniformConditionRHS_Reconverge) {
// If statements reconverge at exit, so test that we can call workgroupBarrier() after an if
// statement with a non-uniform condition that uses short-circuiting.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (false && non_uniform == 42) {
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_NonUniformFunctionCall_Reconverge) {
// If statements reconverge at exit, so test that we can call workgroupBarrier() after an if
// statement with a non-uniform condition.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar() {
if (non_uniform == 42) {
return;
} else {
return;
}
}
fn foo() {
if (non_uniform == 42) {
bar();
} else {
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IfElse_NonUniformReturn_NoReconverge) {
// If statements should not reconverge after non-uniform returns.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
return;
} else {
}
workgroupBarrier();
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:3 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// Switch statement tests.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, Switch_NonUniformCondition_BarrierInCase) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
switch (non_uniform) {
case 42: {
workgroupBarrier();
break;
}
default: {
break;
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
switch (non_uniform) {
^^^^^^
test:5:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
switch (non_uniform) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_NonUniformCondition_BarrierInDefault) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
switch (non_uniform) {
default: {
workgroupBarrier();
break;
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
switch (non_uniform) {
^^^^^^
test:5:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
switch (non_uniform) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_NonUniformBreak) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
switch (condition) {
case 42: {
if (non_uniform == 42) {
break;
}
workgroupBarrier();
}
default: {
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:7 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:8:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_NonUniformBreakInDifferentCase) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
switch (condition) {
case 0: {
if (non_uniform == 42) {
break;
}
}
case 42: {
workgroupBarrier();
}
default: {
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesNonUniformInDifferentCase_WithBreak) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = 0;
switch (condition) {
case 0: {
x = non_uniform;
break;
}
case 42: {
if (x == 0) {
workgroupBarrier();
}
}
default: {
}
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesUniformInDifferentCase_WithBreak) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = non_uniform;
switch (condition) {
case 0: {
x = 5;
break;
}
case 42: {
if (x == 0) {
workgroupBarrier();
}
}
default: {
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:9 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:7 note: control flow depends on possibly non-uniform value
if (x == 0) {
^^
test:6:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var x = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesNonUniformInCase_BarrierAfter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = 0;
switch (condition) {
case 0: {
x = non_uniform;
}
case 42: {
x = 5;
}
default: {
x = 6;
}
}
if (x == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:19:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:18:3 note: control flow depends on possibly non-uniform value
if (x == 0) {
^^
test:9:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
x = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesUniformInAllCases_BarrierAfter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = non_uniform;
switch (condition) {
case 0: {
x = 4;
}
case 42: {
x = 5;
}
default: {
x = 6;
}
}
if (x == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesUniformInSomeCases_BarrierAfter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = non_uniform;
switch (condition) {
case 0: {
x = 4;
}
case 42: {
}
default: {
x = 6;
}
}
if (x == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:18:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:17:3 note: control flow depends on possibly non-uniform value
if (x == 0) {
^^
test:6:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var x = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesUniformInCasesThatDontReturn_BarrierAfter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = non_uniform;
switch (condition) {
case 0: {
x = 4;
}
case 42: {
return;
}
default: {
x = 6;
}
}
if (x == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Switch_VarBecomesUniformAfterConditionalBreak_BarrierAfter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = non_uniform;
switch (condition) {
case 0: {
x = 4;
}
case 42: {
}
default: {
if (false) {
break;
}
x = 6;
}
}
if (x == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:21:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:20:3 note: control flow depends on possibly non-uniform value
if (x == 0) {
^^
test:6:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var x = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_NestedInLoop_VarBecomesNonUniformWithBreak_BarrierInLoop) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = 0;
loop {
if (x == 0) {
workgroupBarrier();
break;
}
switch (condition) {
case 0: {
x = non_uniform;
break;
}
default: {
x = 6;
}
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:5 note: control flow depends on possibly non-uniform value
if (x == 0) {
^^
test:15:13 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
x = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Switch_NestedInLoop_VarBecomesNonUniformWithBreak_BarrierAfterLoop) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(0) var<uniform> condition : i32;
fn foo() {
var x = 0;
loop {
if (false) {
break;
}
switch (condition) {
case 0: {
x = non_uniform;
break;
}
default: {
x = 6;
}
}
x = 5;
}
if (x == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Switch_NonUniformCondition_Reconverge) {
// Switch statements reconverge at exit, so test that we can call workgroupBarrier() after a
// switch statement that contains a non-uniform conditional break.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
switch (non_uniform) {
default: {
break;
}
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Switch_NonUniformBreak_Reconverge) {
// Switch statements reconverge at exit, so test that we can call workgroupBarrier() after a
// switch statement that contains a non-uniform conditional break.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
switch (42) {
default: {
if (non_uniform == 0) {
break;
}
break;
}
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
////////////////////////////////////////////////////////////////////////////////
/// Pointer tests.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
*&v = non_uniform;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
*&v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughCapturedPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
let pv = &v;
*pv = non_uniform;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:7:9 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
*pv = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = non_uniform;
*&v = 42;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughCapturedPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = non_uniform;
let pv = &v;
*pv = 42;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughCapturedPointer_InNonUniformControlFlow) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
let pv = &v;
if (non_uniform == 0) {
*pv = 42;
}
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 0) {
^^
test:7:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 0) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformThroughPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = non_uniform;
if (*&v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
if (*&v == 0) {
^^
test:5:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformLocalThroughCapturedPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = non_uniform;
let pv = &v;
if (*pv == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (*pv == 0) {
^^
test:5:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformLocalThroughPointerParameter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
var v = non_uniform;
bar(&v);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:4:8 note: parameter 'p' of 'bar' may point to a non-uniform value
fn bar(p : ptr<function, i32>) {
^
test:12:7 note: possibly non-uniform value passed via pointer here
bar(&v);
^^
test:11:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformGlobalThroughCapturedPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
let pv = &non_uniform;
if (*pv == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
if (*pv == 0) {
^^
test:6:8 note: reading from 'pv' may result in a non-uniform value
if (*pv == 0) {
^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformGlobalThroughPointerParameter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<storage, i32, read_write>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
bar(&non_uniform);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:5:8 note: parameter 'p' of 'bar' may be non-uniform
if (*p == 0) {
^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformGlobalThroughPointerParameter_ViaReturnValue) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<storage, i32, read_write>) -> i32 {
return *p;
}
fn foo() {
if (0 == bar(&non_uniform)) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (0 == bar(&non_uniform)) {
^^
test:9:12 note: return value of 'bar' may be non-uniform
if (0 == bar(&non_uniform)) {
^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformThroughPointerParameter_BecomesUniformAfterUse) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
if (*p == 0) {
workgroupBarrier();
}
*p = 0;
}
fn foo() {
var v = non_uniform;
bar(&v);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:4:8 note: parameter 'p' of 'bar' may point to a non-uniform value
fn bar(p : ptr<function, i32>) {
^
test:13:7 note: possibly non-uniform value passed via pointer here
bar(&v);
^^
test:12:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformThroughPointerParameter_BecomesUniformAfterCall) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
var v = non_uniform;
bar(&v);
v = 0;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:4:8 note: parameter 'p' of 'bar' may point to a non-uniform value
fn bar(p : ptr<function, i32>) {
^
test:12:7 note: possibly non-uniform value passed via pointer here
bar(&v);
^^
test:11:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadUniformThroughPointer) {
std::string src = R"(
fn foo() {
var v = 42;
if (*&v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, LoadUniformThroughCapturedPointer) {
std::string src = R"(
fn foo() {
var v = 42;
let pv = &v;
if (*pv == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, LoadUniformThroughPointerParameter) {
std::string src = R"(
fn bar(p : ptr<function, i32>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
var v = 42;
bar(&v);
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, LoadUniformThroughNonUniformPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
// The contents of `v` are uniform.
var v = array<i32, 4>();
// The pointer `p` is non-uniform.
let p = &v[non_uniform];
if (*p == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:8:14 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
let p = &v[non_uniform];
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadUniformThroughNonUniformPointer_ViaParameter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, array<i32, 4>>) {
// The pointer `p` is non-uniform.
let local_p = &(*p)[non_uniform];
if (*local_p == 0) {
workgroupBarrier();
}
}
fn foo() {
// The contents of `v` are uniform.
var v = array<i32, 4>();
let p = &v;
bar(p);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (*local_p == 0) {
^^
test:6:23 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
let local_p = &(*p)[non_uniform];
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadUniformThroughNonUniformPointer_ViaParameterChain) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn zoo(p : ptr<function, i32>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn bar(p : ptr<function, i32>) {
zoo(p);
}
fn foo() {
// The contents of `v` are uniform.
var v = array<i32, 4>();
// The pointer `p` is non-uniform.
let p = &v[non_uniform];
bar(p);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:4:8 note: parameter 'p' of 'zoo' may point to a non-uniform value
fn zoo(p : ptr<function, i32>) {
^
test:11:7 note: possibly non-uniform value passed via pointer here
zoo(p);
^
test:10:8 note: reading from 'p' may result in a non-uniform value
fn bar(p : ptr<function, i32>) {
^
test:19:7 note: possibly non-uniform value passed via pointer here
bar(p);
^
test:18:14 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
let p = &v[non_uniform];
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformThroughUniformPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var<storage, read> uniform_idx : i32;
fn foo() {
// The contents of `v` are non-uniform.
var v = array<i32, 4>(0, 0, 0, non_uniform);
// The pointer `p` is uniform.
let p = &v[uniform_idx];
if (*p == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:7:34 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = array<i32, 4>(0, 0, 0, non_uniform);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformThroughUniformPointer_ViaParameter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var<storage, read> uniform_idx : i32;
fn zoo(p : ptr<function, i32>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn bar(p : ptr<function, i32>) {
zoo(p);
}
fn foo() {
// The contents of `v` are non-uniform.
var v = array<i32, 4>(0, 0, 0, non_uniform);
// The pointer `p` is uniform.
let p = &v[uniform_idx];
bar(p);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:5:8 note: parameter 'p' of 'zoo' may point to a non-uniform value
fn zoo(p : ptr<function, i32>) {
^
test:12:7 note: possibly non-uniform value passed via pointer here
zoo(p);
^
test:11:8 note: reading from 'p' may result in a non-uniform value
fn bar(p : ptr<function, i32>) {
^
test:20:7 note: possibly non-uniform value passed via pointer here
bar(p);
^
test:17:34 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = array<i32, 4>(0, 0, 0, non_uniform);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, StoreNonUniformAfterCapturingPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
let pv = &v;
v = non_uniform;
if (*pv == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (*pv == 0) {
^^
test:7:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, StoreUniformAfterCapturingPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = non_uniform;
let pv = &v;
v = 42;
if (*pv == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughLongChainOfPointers) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
let pv1 = &*&v;
let pv2 = &*&*pv1;
*&*&*pv2 = non_uniform;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:8:14 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
*&*&*pv2 = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, LoadNonUniformThroughLongChainOfPointers) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = non_uniform;
let pv1 = &*&v;
let pv2 = &*&*pv1;
if (*&*&*pv2 == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (*&*&*pv2 == 0) {
^^
test:5:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformThenNonUniformThroughDifferentPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
let pv1 = &v;
let pv2 = &v;
*pv1 = 42;
*pv2 = non_uniform;
if (*pv1 == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:3 note: control flow depends on possibly non-uniform value
if (*pv1 == 0) {
^^
test:9:10 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
*pv2 = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThenUniformThroughDifferentPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
var v = 0;
let pv1 = &v;
let pv2 = &v;
*pv1 = non_uniform;
*pv2 = 42;
if (*pv1 == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, UnmodifiedPointerParameterNonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
}
fn foo() {
var v = non_uniform;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:8:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, UnmodifiedPointerParameterUniform) {
std::string src = R"(
fn bar(p : ptr<function, i32>) {
}
fn foo() {
var v = 42;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughPointerInFunctionCall) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
*p = non_uniform;
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:12:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:10:7 note: contents of pointer may become non-uniform after calling 'bar'
bar(&v);
^^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughPointerInFunctionCall) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
*p = 42;
}
fn foo() {
var v = non_uniform;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughPointerInFunctionCallViaArg) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>, a : i32) {
*p = a;
}
fn foo() {
var v = 0;
bar(&v, non_uniform);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:12:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:10:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
bar(&v, non_uniform);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughPointerInFunctionCallViaPointerArg) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>, a : ptr<function, i32>) {
*p = *a;
}
fn foo() {
var v = 0;
var a = non_uniform;
bar(&v, &a);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:10:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var a = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughPointerInFunctionCallViaArg) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>, a : i32) {
*p = a;
}
fn foo() {
var v = non_uniform;
bar(&v, 42);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughPointerInFunctionCallViaPointerArg) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>, a : ptr<function, i32>) {
*p = *a;
}
fn foo() {
var v = non_uniform;
var a = 42;
bar(&v, &a);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignNonUniformThroughPointerInFunctionCallChain) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn f3(p : ptr<function, i32>, a : ptr<function, i32>) {
*p = *a;
}
fn f2(p : ptr<function, i32>, a : ptr<function, i32>) {
f3(p, a);
}
fn f1(p : ptr<function, i32>, a : ptr<function, i32>) {
f2(p, a);
}
fn foo() {
var v = 0;
var a = non_uniform;
f1(&v, &a);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:21:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:20:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:18:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var a = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformThroughPointerInFunctionCallChain) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn f3(p : ptr<function, i32>, a : ptr<function, i32>) {
*p = *a;
}
fn f2(p : ptr<function, i32>, a : ptr<function, i32>) {
f3(p, a);
}
fn f1(p : ptr<function, i32>, a : ptr<function, i32>) {
f2(p, a);
}
fn foo() {
var v = non_uniform;
var a = 42;
f1(&v, &a);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, MakePointerParamUniformInReturnExpression) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn zoo(p : ptr<function, i32>) -> i32 {
*p = 5;
return 6;
}
fn bar(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return zoo(p);
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, MakePointerParamNonUniformInReturnExpression) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn zoo(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return 6;
}
fn bar(p : ptr<function, i32>) -> i32 {
*p = 5;
return zoo(p);
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:18:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:17:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:16:7 note: contents of pointer may become non-uniform after calling 'bar'
bar(&v);
^^
)");
}
TEST_F(UniformityAnalysisTest, PointerParamAssignNonUniformInTrueAndUniformInFalse) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
if (true) {
*p = non_uniform;
} else {
*p = 5;
}
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:14:7 note: contents of pointer may become non-uniform after calling 'bar'
bar(&v);
^^
)");
}
TEST_F(UniformityAnalysisTest, ConditionalAssignNonUniformToPointerParamAndReturn) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
if (true) {
*p = non_uniform;
return;
}
*p = 5;
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:14:7 note: contents of pointer may become non-uniform after calling 'bar'
bar(&v);
^^
)");
}
TEST_F(UniformityAnalysisTest, ConditionalAssignNonUniformToPointerParamAndBreakFromSwitch) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var<uniform> condition : i32;
fn bar(p : ptr<function, i32>) {
switch (condition) {
case 0 {
if (true) {
*p = non_uniform;
break;
}
*p = 5;
}
default {
*p = 6;
}
}
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:24:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:23:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:22:7 note: contents of pointer may become non-uniform after calling 'bar'
bar(&v);
^^
)");
}
TEST_F(UniformityAnalysisTest, ConditionalAssignNonUniformToPointerParamAndBreakFromLoop) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
loop {
if (true) {
*p = non_uniform;
break;
}
*p = 5;
}
}
fn foo() {
var v = 0;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:18:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:17:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:16:7 note: contents of pointer may become non-uniform after calling 'bar'
bar(&v);
^^
)");
}
TEST_F(UniformityAnalysisTest, ConditionalAssignNonUniformToPointerParamAndContinue) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo(p : ptr<function, i32>) {
loop {
if (*p == 0) {
workgroupBarrier();
break;
}
if (true) {
*p = non_uniform;
continue;
}
*p = 5;
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:7 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:5 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:12:12 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
*p = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, PointerParamMaybeBecomesUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
if (true) {
*p = 5;
return;
}
}
fn foo() {
var v = non_uniform;
bar(&v);
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:15:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:12:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, PointerParamModifiedInNonUniformControlFlow) {
std::string src = R"(
@binding(0) @group(0) var<storage, read_write> non_uniform_global : i32;
fn foo(p : ptr<function, i32>) {
*p = 42;
}
@compute @workgroup_size(64)
fn main() {
var a : i32;
if (non_uniform_global == 0) {
foo(&a);
}
if (a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (non_uniform_global == 0) {
^^
test:11:7 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (non_uniform_global == 0) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, PointerParamAssumedModifiedInNonUniformControlFlow) {
std::string src = R"(
@binding(0) @group(0) var<storage, read_write> non_uniform_global : i32;
fn foo(p : ptr<function, i32>) {
// Do not modify 'p', uniformity analysis presently assumes it will be.
}
@compute @workgroup_size(64)
fn main() {
var a : i32;
if (non_uniform_global == 0) {
foo(&a);
}
if (a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (non_uniform_global == 0) {
^^
test:11:7 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (non_uniform_global == 0) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, PointerParamModifiedInNonUniformControlFlow_NestedCall) {
std::string src = R"(
@binding(0) @group(0) var<storage, read_write> non_uniform_global : i32;
fn foo2(p : ptr<function, i32>) {
*p = 42;
}
fn foo(p : ptr<function, i32>) {
foo2(p);
}
@compute @workgroup_size(64)
fn main() {
var a : i32;
if (non_uniform_global == 0) {
foo(&a);
}
if (a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:20:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:3 note: control flow depends on possibly non-uniform value
if (non_uniform_global == 0) {
^^
test:15:7 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (non_uniform_global == 0) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, PointerParamModifiedInUniformControlFlow) {
std::string src = R"(
@binding(0) @group(0) var<uniform> uniform_global : i32;
fn foo(p : ptr<function, i32>) {
*p = 42;
}
@compute @workgroup_size(64)
fn main() {
var a : i32;
if (uniform_global == 0) {
foo(&a);
}
if (a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, NonUniformPointerParameterBecomesUniform_AfterUse) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(a : ptr<function, i32>, b : ptr<function, i32>) {
*b = *a;
*a = 0;
}
fn foo() {
var a = non_uniform;
var b = 0;
bar(&a, &b);
if (b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (b == 0) {
^^
test:10:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var a = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, NonUniformPointerParameterBecomesUniform_BeforeUse) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(a : ptr<function, i32>, b : ptr<function, i32>) {
*a = 0;
*b = *a;
}
fn foo() {
var a = non_uniform;
var b = 0;
bar(&a, &b);
if (b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, UniformPointerParameterBecomesNonUniform_BeforeUse) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(a : ptr<function, i32>, b : ptr<function, i32>) {
*a = non_uniform;
*b = *a;
}
fn foo() {
var a = 0;
var b = 0;
bar(&a, &b);
if (b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (b == 0) {
^^
test:12:11 note: contents of pointer may become non-uniform after calling 'bar'
bar(&a, &b);
^^
)");
}
TEST_F(UniformityAnalysisTest, UniformPointerParameterBecomesNonUniform_AfterUse) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(a : ptr<function, i32>, b : ptr<function, i32>) {
*b = *a;
*a = non_uniform;
}
fn foo() {
var a = 0;
var b = 0;
bar(&a, &b);
if (b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, NonUniformPointerParameterUpdatedInPlace) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
(*p)++;
}
fn foo() {
var v = non_uniform;
bar(&v);
if (v == 1) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:12:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (v == 1) {
^^
test:9:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var v = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, MultiplePointerParametersBecomeNonUniform) {
// The analysis traverses the tree for each pointer parameter, and we need to make sure that we
// reset the "visited" state of nodes in between these traversals to properly capture each of
// their uniformity states.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(a : ptr<function, i32>, b : ptr<function, i32>) {
*a = non_uniform;
*b = non_uniform;
}
fn foo() {
var a = 0;
var b = 0;
bar(&a, &b);
if (b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (b == 0) {
^^
test:12:11 note: contents of pointer may become non-uniform after calling 'bar'
bar(&a, &b);
^^
)");
}
TEST_F(UniformityAnalysisTest, MultiplePointerParametersWithEdgesToEachOther) {
// The analysis traverses the tree for each pointer parameter, and we need to make sure that we
// reset the "visited" state of nodes in between these traversals to properly capture each of
// their uniformity states.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(a : ptr<function, i32>, b : ptr<function, i32>, c : ptr<function, i32>) {
*a = *a;
*b = *b;
*c = *a + *b;
}
fn foo() {
var a = non_uniform;
var b = 0;
var c = 0;
bar(&a, &b, &c);
if (c == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:3 note: control flow depends on possibly non-uniform value
if (c == 0) {
^^
test:11:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var a = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, MaximumNumberOfPointerParameters) {
// Create a function with the maximum number of parameters, all pointers, to stress the
// quadratic nature of the analysis.
ProgramBuilder b;
auto& ty = b.ty;
// fn foo(p0 : ptr<function, i32>, p1 : ptr<function, i32>, ...) {
// let rhs = *p0 + *p1 + ... + *p244;
// *p1 = rhs;
// *p2 = rhs;
// ...
// *p254 = rhs;
// }
Vector<const ast::Parameter*, 8> params;
Vector<const ast::Statement*, 8> foo_body;
const ast::Expression* rhs_init = b.Deref("p0");
for (int i = 1; i < 255; i++) {
rhs_init = b.Add(rhs_init, b.Deref("p" + std::to_string(i)));
}
foo_body.Push(b.Decl(b.Let("rhs", rhs_init)));
for (int i = 0; i < 255; i++) {
params.Push(b.Param("p" + std::to_string(i), ty.ptr<function, i32>()));
if (i > 0) {
foo_body.Push(b.Assign(b.Deref("p" + std::to_string(i)), "rhs"));
}
}
b.Func("foo", std::move(params), ty.void_(), foo_body);
// var<private> non_uniform_global : i32;
// fn main() {
// var v0 : i32;
// var v1 : i32;
// ...
// var v254 : i32;
// v0 = non_uniform_global;
// foo(&v0, &v1, ..., &v254);
// if (v254 == 0) {
// workgroupBarrier();
// }
// }
b.GlobalVar("non_uniform_global", ty.i32(), core::AddressSpace::kPrivate);
Vector<const ast::Statement*, 8> main_body;
Vector<const ast::Expression*, 8> args;
for (int i = 0; i < 255; i++) {
auto name = "v" + std::to_string(i);
main_body.Push(b.Decl(b.Var(name, ty.i32())));
args.Push(b.AddressOf(name));
}
main_body.Push(b.Assign("v0", "non_uniform_global"));
main_body.Push(b.CallStmt(b.Call("foo", args)));
main_body.Push(b.If(b.Equal("v254", 0_i), b.Block(b.CallStmt(b.Call("workgroupBarrier")))));
b.Func("main", tint::Empty, ty.void_(), main_body);
RunTest(std::move(b), false);
EXPECT_EQ(error_,
R"(error: 'workgroupBarrier' must only be called from uniform control flow
note: control flow depends on possibly non-uniform value
note: reading from module-scope private variable 'non_uniform_global' may result in a non-uniform value)");
}
TEST_F(UniformityAnalysisTest, AssignUniformToPrivatePointerParameter_StillNonUniform) {
std::string src = R"(
var<private> non_uniform : i32;
fn bar(p : ptr<private, i32>) {
*p = 0;
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
bar(&non_uniform);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:6:8 note: parameter 'p' of 'bar' may be non-uniform
if (*p == 0) {
^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformToWorkgroupPointerParameter_StillNonUniform) {
std::string src = R"(
var<workgroup> non_uniform : i32;
fn bar(p : ptr<workgroup, i32>) {
*p = 0;
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
bar(&non_uniform);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:6:8 note: parameter 'p' of 'bar' may be non-uniform
if (*p == 0) {
^
)");
}
TEST_F(UniformityAnalysisTest, AssignUniformToStoragePointerParameter_StillNonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<storage, i32, read_write>) {
*p = 0;
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
bar(&non_uniform);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:6:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:6:8 note: parameter 'p' of 'bar' may be non-uniform
if (*p == 0) {
^
)");
}
TEST_F(UniformityAnalysisTest, LoadFromReadOnlyStoragePointerParameter_AlwaysUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> non_uniform : i32;
fn bar(p : ptr<storage, i32, read>) {
if (*p == 0) {
workgroupBarrier();
}
}
fn foo() {
bar(&non_uniform);
}
)";
RunTest(src, true);
}
////////////////////////////////////////////////////////////////////////////////
/// Tests to cover access to aggregate types.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, VectorElement_Uniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> v : vec4<i32>;
fn foo() {
if (v[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, VectorElement_NonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> v : vec4<i32>;
fn foo() {
if (v[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (v[2] == 0) {
^^
test:5:7 note: reading from read_write storage buffer 'v' may result in a non-uniform value
if (v[2] == 0) {
^
)");
}
TEST_F(UniformityAnalysisTest, VectorSwizzle_NonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> v : vec4<i32>;
fn foo() {
if (any(v.xy == vec2())) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (any(v.xy == vec2())) {
^^
test:5:11 note: reading from read_write storage buffer 'v' may result in a non-uniform value
if (any(v.xy == vec2())) {
^
)");
}
TEST_F(UniformityAnalysisTest, VectorSwizzleFromPointer_NonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> v : vec4<i32>;
fn foo() {
if (any((&v).xy == vec2())) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (any((&v).xy == vec2())) {
^^
test:5:13 note: reading from read_write storage buffer 'v' may result in a non-uniform value
if (any((&v).xy == vec2())) {
^
)");
}
TEST_F(UniformityAnalysisTest, VectorElement_BecomesNonUniform_BeforeCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[2] = rw;
if (v[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v[2] == 0) {
^^
test:6:10 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v[2] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, VectorElement_BecomesNonUniform_AfterCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
if (v[2] == 0) {
v[2] = rw;
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, VectorElement_DifferentElementBecomesNonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
if (v[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v[2] == 0) {
^^
test:6:10 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, VectorElement_ElementBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
v[1] = 42;
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (v[1] == 0) {
^^
test:6:10 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, VectorElement_VectorBecomesUniform_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
v = vec4(1, 2, 3, 4);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, VectorElementViaMember_VectorBecomesUniform_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v.y = rw;
v = vec4(1, 2, 3, 4);
if (v.y == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, VectorElement_VectorBecomesUniform_ThroughPointer_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
*(&v) = vec4(1, 2, 3, 4);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
VectorElement_VectorBecomesUniform_ThroughPointerChain_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
*(&(*(&(*(&v))))) = vec4(1, 2, 3, 4);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
VectorElement_VectorBecomesUniform_ThroughCapturedPointer_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
let p = &v;
*p = vec4(1, 2, 3, 4);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, VectorElement_VectorBecomesUniform_PartialAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
v = vec4(1, 2, 3, v[3]);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (v[1] == 0) {
^^
test:6:10 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
VectorElement_VectorBecomesUniform_PartialAssignment_ViaPointerDerefIndex) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
let p = &v;
(*p)[1] = rw;
v = vec4(1, 2, 3, v[3]);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (v[1] == 0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
(*p)[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
VectorElement_VectorBecomesUniform_PartialAssignment_ViaPointerIndex) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
let p = &v;
p[1] = rw;
v = vec4(1, 2, 3, v[3]);
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (v[1] == 0) {
^^
test:7:10 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
p[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, VectorElementViaMember_VectorBecomesUniform_PartialAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v.y = rw;
v = vec4(1, 2, 3, v.w);
if (v.y == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (v.y == 0) {
^^
test:6:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v.y = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
VectorElementViaMember_VectorBecomesUniform_PartialAssignment_ViaPointerDerefDot) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
let p = &v;
(*p).y = rw;
v = vec4(1, 2, 3, v.w);
if (v.y == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (v.y == 0) {
^^
test:7:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
(*p).y = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
VectorElementViaMember_VectorBecomesUniform_PartialAssignment_ViaPointerDot) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
let p = &v;
p.y = rw;
v = vec4(1, 2, 3, v.w);
if (v.y == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (v.y == 0) {
^^
test:7:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
p.y = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, VectorElement_DifferentElementBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, the whole vector
// is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v : vec4<i32>;
v[1] = rw;
v[2] = 42;
if (v[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (v[1] == 0) {
^^
test:6:10 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, VectorElement_NonUniform_AnyBuiltin) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn foo() {
var v : vec4<i32>;
v[1] = non_uniform_global;
if (any(v == vec4(42))) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (any(v == vec4(42))) {
^^
test:6:10 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
v[1] = non_uniform_global;
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_ElementBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
m[1][1] = 42.0;
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_ElementBecomesUniform_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
m = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), vec3(7.0, 8.0, 9.0));
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, MatrixElement_ElementBecomesUniform_ThroughPointer_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
*(&m) = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), vec3(7.0, 8.0, 9.0));
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ElementBecomesUniform_ThroughPointerChain_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
*(&(*(&(*(&m))))) = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), vec3(7.0, 8.0, 9.0));
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ElementBecomesUniform_ThroughCapturedPointer_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
let p = &m;
*p = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), vec3(7.0, 8.0, 9.0));
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, MatrixElement_ColumnBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
m[1] = vec3(0.0, 42.0, 0.0);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_ColumnBecomesUniform_ThroughPartialPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
*(&(m[1])) = vec3(0.0, 42.0, 0.0);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_ColumnBecomesUniform_ThroughPartialPointerChain) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
*(&(*(&(m[1])))) = vec3(0.0, 42.0, 0.0);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_ColumnBecomesUniform_ThroughCapturedPartialPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m[1];
m[1][1] = rw;
*p = vec3(0.0, 42.0, 0.0);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ColumnBecomesUniform_ThroughCapturedPartialPointer_PointerDerefIndex) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m[1];
m[1][1] = rw;
(*p)[0] = 0.0;
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ColumnBecomesUniform_ThroughCapturedPartialPointer_PointerIndex) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m[1];
m[1][1] = rw;
p[0] = 0.0;
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ColumnBecomesUniform_ThroughCapturedPartialPointer_PointerDerefDot) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m[1];
m[1][1] = rw;
(*p).x = 0.0;
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ColumnBecomesUniform_ThroughCapturedPartialPointer_PointerDot) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m[1];
m[1][1] = rw;
p.x = 0.0;
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_ColumnBecomesUniform_ThroughCapturedPartialPointerChain) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m[1];
m[1][1] = rw;
*(&(*p)) = vec3(0.0, 42.0, 0.0);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_ColumnBecomesUniform_ThroughCapturedPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m;
m[1][1] = rw;
(*p)[1] = vec3(0.0, 42.0, 0.0);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_MatrixBecomesUniform_PartialAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
m = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), m[2]);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_MatrixBecomesUniform_PartialAssignment_ThroughPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
*(&m) = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), m[2]);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_MatrixBecomesUniform_PartialAssignment_ThroughCapturedPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &m;
m[1][1] = rw;
*p = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), (*p)[2]);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
MatrixElement_MatrixBecomesUniform_PartialAssignment_ThroughCapturedPointerChain) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
let p = &(*(&m));
m[1][1] = rw;
*p = mat3x3<f32>(vec3(1.0, 2.0, 3.0), vec3(4.0, 5.0, 6.0), (*p)[2]);
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:7:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, MatrixElement_DifferentElementBecomesUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : f32;
fn foo() {
var m : mat3x3<f32>;
m[1][1] = rw;
m[2][2] = 42.0;
if (m[1][1] == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (m[1][1] == 0.0) {
^^
test:6:13 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
m[1][1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_Uniform) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read> s : S;
fn foo() {
if (s.b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, StructMember_NonUniform) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> s : S;
fn foo() {
if (s.b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (s.b == 0) {
^^
test:9:7 note: reading from read_write storage buffer 's' may result in a non-uniform value
if (s.b == 0) {
^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_BecomesNonUniform_BeforeCondition) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.b = rw;
if (s.b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:12:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (s.b == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.b = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_BecomesNonUniform_AfterCondition) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
if (s.b == 0) {
s.b = rw;
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, StructMember_DifferentMemberBecomesNonUniform) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
if (s.b == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:12:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (s.b == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_MemberBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to a member, that member is
// still considered to be non-uniform.
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
s.a = 0;
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_MemberBecomesUniformThroughCapturedPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to a member, that member is
// still considered to be non-uniform.
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
let p = &s;
s.a = rw;
(*p).a = 0;
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:11:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_MemberBecomesUniformThroughPartialPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to a member, that member is
// still considered to be non-uniform.
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
*&s.a = 0;
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_MemberBecomesUniformThroughCapturedPartialPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to a member, that member is
// still considered to be non-uniform.
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
let p = &s.a;
s.a = rw;
(*p) = 0;
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:11:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_StructBecomesUniform_FullAssignment) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
s = S(1, 2);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, StructMember_StructBecomesUniform_PartialAssignment) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
s = S(1, s.b);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_StructBecomesUniform_FullAssignment_ThroughPointer) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
*(&s) = S(1, 2);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
StructMember_StructBecomesUniform_FullAssignment_ThroughCapturedPointer) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
let p = &s;
s.a = rw;
*p = S(1, 2);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
StructMember_StructBecomesUniform_FullAssignment_ThroughCapturedPointerChain) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
let p = &(*(&s));
s.a = rw;
*p = S(1, 2);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, StructMember_StructBecomesUniform_PartialAssignment_ThroughPointer) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
*(&s) = S(1, (*(&s)).b);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
StructMember_StructBecomesUniform_PartialAssignment_ThroughCapturedPointer) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
let p = &s;
s.a = rw;
*p = S(1, (*p).b);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:11:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
StructMember_StructBecomesUniform_PartialAssignment_ThroughCapturedPointerChain) {
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
let p = &(*(&s));
s.a = rw;
*p = S(1, (*p).b);
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:11:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, StructMember_DifferentMemberBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to a member, the whole struct
// is still considered to be non-uniform.
std::string src = R"(
struct S {
a : i32,
b : i32,
}
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var s : S;
s.a = rw;
s.b = 0;
if (s.a == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (s.a == 0) {
^^
test:10:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
s.a = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_Uniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> arr : array<i32>;
fn foo() {
if (arr[7] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayElement_NonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> arr : array<i32>;
fn foo() {
if (arr[7] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (arr[7] == 0) {
^^
test:5:7 note: reading from read_write storage buffer 'arr' may result in a non-uniform value
if (arr[7] == 0) {
^^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_BecomesNonUniform_BeforeCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[2] = rw;
if (arr[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (arr[2] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[2] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_BecomesNonUniform_AfterCondition) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
if (arr[2] == 0) {
arr[2] = rw;
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayElement_DifferentElementBecomesNonUniform) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
if (arr[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (arr[2] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_DifferentElementBecomesNonUniformThroughPartialPointer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
let pa = &arr[1];
*pa = rw;
if (arr[2] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[2] == 0) {
^^
test:7:9 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
*pa = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform) {
// For aggregate types, we conservatively consider them to be forever non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, that element is
// still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
arr[1] = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
arr = array<i32, 4>(1, 2, 3, 4);
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform_PartialAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
arr = array<i32, 4>(1, 2, 3, arr[3]);
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_DifferentElementBecomesUniform) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element, the whole array
// is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
arr[2] = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform_ThroughPartialPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element through a
// pointer, the whole array is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
*(&(arr[2])) = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform_ThroughPartialPointerChain) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element through a
// pointer, the whole array is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
*(&(*(&(*(&(arr[2])))))) = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:6:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform_ThroughCapturedPartialPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element through a
// pointer, the whole array is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
let pa = &arr[2];
arr[1] = rw;
*pa = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:7:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_ElementBecomesUniform_ThroughCapturedPartialPointerChain) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element through a
// pointer, the whole array is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
let pa = &(*(&arr[2]));
arr[1] = rw;
*pa = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:7:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ElementBecomesUniform_ThroughCapturedPointer) {
// For aggregate types, we conservatively consider them to be non-uniform once they
// become non-uniform. Test that after assigning a uniform value to an element through a
// pointer, the whole array is still considered to be non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
let pa = &arr;
arr[1] = rw;
(*pa)[2] = 42;
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (arr[1] == 0) {
^^
test:7:12 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
arr[1] = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_ArrayBecomesUniform_ThroughPointer_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
*(&arr) = array<i32, 4>();
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
ArrayElement_ArrayBecomesUniform_ThroughPointerChain_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
arr[1] = rw;
*(&(*(&(*(&arr))))) = array<i32, 4>();
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
ArrayElement_ArrayBecomesUniform_ThroughCapturedPointer_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
let pa = &arr;
arr[1] = rw;
*pa = array<i32, 4>();
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest,
ArrayElement_ArrayBecomesUniform_ThroughCapturedPointerChain_FullAssignment) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var arr : array<i32, 4>;
let pa = &(*(&arr));
arr[1] = rw;
*pa = array<i32, 4>();
if (arr[1] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayElement_AssignUniformToElementWithNonUniformIndex) {
std::string src = R"(
var<private> non_uniform : i32;
fn foo() {
var arr : array<i32, 4>;
arr[non_uniform] = 0;
if (arr[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (arr[0] == 0) {
^^
test:6:7 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
arr[non_uniform] = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayElement_AssignUniformToElementWithNonUniformIndex_ViaPointer) {
std::string src = R"(
var<private> non_uniform : i32;
fn foo() {
var arr : array<i32, 4>;
*&(arr[non_uniform]) = 0;
if (arr[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (arr[0] == 0) {
^^
test:6:10 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
*&(arr[non_uniform]) = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_AssignUniformToElementWithNonUniformIndex_ViaPointer_ImplicitDeref) {
std::string src = R"(
var<private> non_uniform : i32;
fn foo() {
var arr : array<i32, 4>;
(&arr)[non_uniform] = 0;
if (arr[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (arr[0] == 0) {
^^
test:6:10 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
(&arr)[non_uniform] = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_AssignUniformToElementWithNonUniformIndex_ViaStoredPointer) {
std::string src = R"(
var<private> non_uniform : i32;
fn foo() {
var arr : array<i32, 4>;
let p = &(arr[non_uniform]);
*p = 0;
if (arr[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (arr[0] == 0) {
^^
test:6:17 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
let p = &(arr[non_uniform]);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_AssignUniformToElementWithNonUniformIndex_ViaPointerParameter) {
std::string src = R"(
var<private> non_uniform : i32;
fn foo(param : ptr<function, array<i32, 4>>) {
let p = &((*param)[non_uniform]);
*p = 0;
if ((*param)[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if ((*param)[0] == 0) {
^^
test:5:22 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
let p = &((*param)[non_uniform]);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_AssignUniformToElementWithNonUniformIndex_ViaPointerParameter_ImplicitDeref) {
std::string src = R"(
var<private> non_uniform : i32;
fn foo(param : ptr<function, array<i32, 4>>) {
let p = &(param[non_uniform]);
*p = 0;
if ((*param)[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if ((*param)[0] == 0) {
^^
test:5:19 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
let p = &(param[non_uniform]);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest,
ArrayElement_AssignUniformToElementWithNonUniformIndex_ViaPartialPointerParameter) {
std::string src = R"(
var<private> non_uniform : i32;
fn bar(p : ptr<function, i32>) {
*p = 0;
}
fn foo() {
var arr : array<i32, 4>;
let p = &(arr[non_uniform]);
bar(p);
if (arr[0] == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:13:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on possibly non-uniform value
if (arr[0] == 0) {
^^
test:10:17 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
let p = &(arr[non_uniform]);
^^^^^^^^^^^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// Miscellaneous statement and expression tests.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, NonUniformDiscard) {
// Non-uniform discard statements should not cause uniformity issues.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
discard;
}
_ = dpdx(1.0);
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, FunctionReconvergesOnExit) {
// Call a function that has returns during non-uniform control flow, and test that the analysis
// reconverges when returning to the caller.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
var<private> p : i32;
fn foo() {
if (rw == 0) {
p = 42;
return;
}
p = 5;
return;
}
fn main() {
foo();
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, TypeInitializer) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn foo() {
if (i32(non_uniform_global) == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (i32(non_uniform_global) == 0) {
^^
test:5:11 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (i32(non_uniform_global) == 0) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Conversion) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn foo() {
if (f32(non_uniform_global) == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (f32(non_uniform_global) == 0.0) {
^^
test:5:11 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (f32(non_uniform_global) == 0.0) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Bitcast) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn foo() {
if (bitcast<f32>(non_uniform_global) == 0.0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (bitcast<f32>(non_uniform_global) == 0.0) {
^^
test:5:20 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
if (bitcast<f32>(non_uniform_global) == 0.0) {
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, CompoundAssignment_NonUniformRHS) {
// Use compound assignment with a non-uniform RHS on a variable.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v = 0;
v += rw;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:6:8 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
v += rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, CompoundAssignment_UniformRHS_StillNonUniform) {
// Use compound assignment with a uniform RHS on a variable that is already non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v = rw;
v += 1;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:5:11 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
var v = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, CompoundAssignment_Global) {
// Use compound assignment on a global variable.
// Tests that we do not assume there is always a variable node for the LHS, but we still process
// the expression.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
var<private> v : array<i32, 4>;
fn bar(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var f = rw;
v[bar(&f)] += 1;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:6:8 note: parameter 'p' of 'bar' may point to a non-uniform value
fn bar(p : ptr<function, i32>) -> i32 {
^
test:15:9 note: possibly non-uniform value passed via pointer here
v[bar(&f)] += 1;
^^
test:14:11 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
var f = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, IncDec_StillNonUniform) {
// Use increment on a variable that is already non-uniform.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
var v = rw;
v++;
if (v == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (v == 0) {
^^
test:5:11 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
var v = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, IncDec_Global) {
// Use increment on a global variable.
// Tests that we do not assume there is always a variable node for the LHS, but we still process
// the expression.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
var<private> v : array<i32, 4>;
fn bar(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var f = rw;
v[bar(&f)]++;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:6:8 note: parameter 'p' of 'bar' may point to a non-uniform value
fn bar(p : ptr<function, i32>) -> i32 {
^
test:15:9 note: possibly non-uniform value passed via pointer here
v[bar(&f)]++;
^^
test:14:11 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
var f = rw;
^^
)");
}
TEST_F(UniformityAnalysisTest, AssignmentEval_LHS_Then_RHS_Pass) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn b(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return 0;
}
fn a(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var i = 0;
var arr : array<i32, 4>;
arr[a(&i)] = arr[b(&i)];
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, AssignmentEval_LHS_Then_RHS_Fail) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn a(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return 0;
}
fn b(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var i = 0;
var arr : array<i32, 4>;
arr[a(&i)] = arr[b(&i)];
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:9:6 note: parameter 'p' of 'b' may point to a non-uniform value
fn b(p : ptr<function, i32>) -> i32 {
^
test:19:22 note: possibly non-uniform value passed via pointer here
arr[a(&i)] = arr[b(&i)];
^^
test:19:9 note: contents of pointer may become non-uniform after calling 'a'
arr[a(&i)] = arr[b(&i)];
^^
)");
}
TEST_F(UniformityAnalysisTest, AssignmentEval_LHSContainsViolation) {
std::string src = R"(
var<private> non_uniform : i32;
fn bar(cond : i32) -> i32 {
if (cond == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var arr : array<i32, 4>;
arr[bar(non_uniform)] = 0;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (cond == 0) {
^^
test:4:8 note: parameter 'cond' of 'bar' may be non-uniform
fn bar(cond : i32) -> i32 {
^^^^
test:13:11 note: possibly non-uniform value passed here
arr[bar(non_uniform)] = 0;
^^^^^^^^^^^
test:13:11 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
arr[bar(non_uniform)] = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignmentEval_LHSContainsViolation_ViaExplicitDeref) {
std::string src = R"(
var<private> non_uniform : i32;
fn bar(cond : i32) -> i32 {
if (cond == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var arr : array<i32, 4>;
*&(arr[bar(non_uniform)]) = 0;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (cond == 0) {
^^
test:4:8 note: parameter 'cond' of 'bar' may be non-uniform
fn bar(cond : i32) -> i32 {
^^^^
test:13:14 note: possibly non-uniform value passed here
*&(arr[bar(non_uniform)]) = 0;
^^^^^^^^^^^
test:13:14 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
*&(arr[bar(non_uniform)]) = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignmentEval_LHSContainsViolation_ViaPointerArrayIndex) {
std::string src = R"(
var<private> non_uniform : i32;
fn bar(cond : i32) -> i32 {
if (cond == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var arr : array<i32, 4>;
(&arr)[bar(non_uniform)] = 0;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (cond == 0) {
^^
test:4:8 note: parameter 'cond' of 'bar' may be non-uniform
fn bar(cond : i32) -> i32 {
^^^^
test:13:14 note: possibly non-uniform value passed here
(&arr)[bar(non_uniform)] = 0;
^^^^^^^^^^^
test:13:14 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
(&arr)[bar(non_uniform)] = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, AssignmentEval_LHSContainsViolation_ViaPointerMemberAccessor) {
std::string src = R"(
var<private> non_uniform : i32;
fn bar(cond : i32) -> i32 {
if (cond == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var arr : array<vec4i, 4>;
(&(arr[bar(non_uniform)])).y = 0;
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (cond == 0) {
^^
test:4:8 note: parameter 'cond' of 'bar' may be non-uniform
fn bar(cond : i32) -> i32 {
^^^^
test:13:14 note: possibly non-uniform value passed here
(&(arr[bar(non_uniform)])).y = 0;
^^^^^^^^^^^
test:13:14 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
(&(arr[bar(non_uniform)])).y = 0;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, CompoundAssignmentEval_LHS_Then_RHS_Pass) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn b(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return 0;
}
fn a(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var i = 0;
var arr : array<i32, 4>;
arr[a(&i)] += arr[b(&i)];
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, CompoundAssignmentEval_LHS_Then_RHS_Fail) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn a(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return 0;
}
fn b(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
return 0;
}
fn foo() {
var i = 0;
var arr : array<i32, 4>;
arr[a(&i)] += arr[b(&i)];
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:9:6 note: parameter 'p' of 'b' may point to a non-uniform value
fn b(p : ptr<function, i32>) -> i32 {
^
test:19:23 note: possibly non-uniform value passed via pointer here
arr[a(&i)] += arr[b(&i)];
^^
test:19:9 note: contents of pointer may become non-uniform after calling 'a'
arr[a(&i)] += arr[b(&i)];
^^
)");
}
TEST_F(UniformityAnalysisTest, CompoundAssignmentEval_RHS_Makes_LHS_NonUniform_After_Load) {
// Test that the LHS is loaded from before the RHS makes is evaluated.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) -> i32 {
*p = non_uniform;
return 0;
}
fn foo() {
var i = 0;
var arr : array<i32, 4>;
i += arr[bar(&i)];
if (i == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, CompoundAssignmentEval_RHS_Makes_LHS_Uniform_After_Load) {
// Test that the LHS is loaded from before the RHS makes is evaluated.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) -> i32 {
*p = 0;
return 0;
}
fn foo() {
var i = non_uniform;
var arr : array<i32, 4>;
i += arr[bar(&i)];
if (i == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (i == 0) {
^^
test:10:11 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
var i = non_uniform;
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, CompoundAssignmentEval_LHS_OnlyOnce) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
*p = non_uniform;
return 0;
}
fn foo(){
var f : i32 = 0;
var arr : array<i32, 4>;
arr[bar(&f)] += 1;
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, IncDec_LHS_OnlyOnce) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar(p : ptr<function, i32>) -> i32 {
if (*p == 0) {
workgroupBarrier();
}
*p = non_uniform;
return 0;
}
fn foo(){
var f : i32 = 0;
var arr : array<i32, 4>;
arr[bar(&f)]++;
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ShortCircuiting_UniformLHS) {
std::string src = R"(
@group(0) @binding(0) var<storage, read> uniform_global : i32;
fn main() {
let b = (uniform_global == 0) && (dpdx(1.0) == 0.0);
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ShortCircuiting_NonUniformLHS) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn main() {
let b = (non_uniform_global == 0) && (dpdx(1.0) == 0.0);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:5:41 error: 'dpdx' must only be called from uniform control flow
let b = (non_uniform_global == 0) && (dpdx(1.0) == 0.0);
^^^^^^^^^
test:5:11 note: control flow depends on possibly non-uniform value
let b = (non_uniform_global == 0) && (dpdx(1.0) == 0.0);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
test:5:12 note: reading from read_write storage buffer 'non_uniform_global' may result in a non-uniform value
let b = (non_uniform_global == 0) && (dpdx(1.0) == 0.0);
^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ShortCircuiting_ReconvergeLHS) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn main() {
let b = (non_uniform_global == 0) && false;
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ShortCircuiting_ReconvergeRHS) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn main() {
let b = false && (non_uniform_global == 0);
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ShortCircuiting_ReconvergeBoth) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform_global : i32;
fn main() {
let b = (non_uniform_global != 0) && (non_uniform_global != 42);
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, DeadCode_AfterReturn) {
// Dead code after a return statement shouldn't cause uniformity errors.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
return;
if (non_uniform == 42) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayLength) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> arr : array<f32>;
fn foo() {
for (var i = 0u; i < arrayLength(&arr); i++) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayLength_OnPtrArg) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> arr : array<f32>;
fn bar(p : ptr<storage, array<f32>, read_write>) {
for (var i = 0u; i < arrayLength(p); i++) {
workgroupBarrier();
}
}
fn foo() {
bar(&arr);
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ArrayLength_PtrArgRequiredToBeUniformForRetval_Pass) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> arr : array<f32>;
fn length(p : ptr<storage, array<f32>, read_write>) -> u32 {
return arrayLength(p);
}
fn foo() {
for (var i = 0u; i < length(&arr); i++) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
// TODO(jrprice): This test requires variable pointers.
TEST_F(UniformityAnalysisTest, DISABLED_ArrayLength_PtrArgRequiredToBeUniformForRetval_Fail) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var<storage, read_write> arr1 : array<f32>;
@group(0) @binding(2) var<storage, read_write> arr2 : array<f32>;
fn length(p : ptr<storage, array<f32>, read_write>) -> u32 {
return arrayLength(p);
}
fn foo() {
let non_uniform_ptr = select(&arr1, &arr2, non_uniform == 0);
let len = length(non_uniform_ptr);
if (len > 10) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:3 note: control flow depends on non-uniform value
if (len > 10) {
^^
test:14:20 note: passing non-uniform pointer to 'length' may produce a non-uniform output
let len = length(non_uniform_ptr, &len);
^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayLength_PtrArgRequiredToBeUniformForOtherPtrResult_Pass) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> arr : array<f32>;
fn length(p : ptr<storage, array<f32>, read_write>, out : ptr<function, u32>) {
*out = arrayLength(p);
}
fn foo() {
var len : u32;
length(&arr, &len);
if (len > 10) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
// TODO(jrprice): This test requires variable pointers.
TEST_F(UniformityAnalysisTest,
DISABLED_ArrayLength_PtrArgRequiredToBeUniformForOtherPtrResult_Fail) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var<storage, read_write> arr1 : array<f32>;
@group(0) @binding(2) var<storage, read_write> arr2 : array<f32>;
fn length(p : ptr<storage, array<f32>, read_write>, out : ptr<function, u32>) {
*out = arrayLength(p);
}
fn foo() {
var len : u32;
let non_uniform_ptr = select(&arr1, &arr2, non_uniform == 0);
length(non_uniform_ptr, &len);
if (len > 10) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:17:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:16:3 note: control flow depends on non-uniform value
if (len > 10) {
^^
test:15:10 note: passing non-uniform pointer to 'length' may produce a non-uniform output
length(non_uniform_ptr, &len);
^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, ArrayLength_PtrArgRequiresUniformityAndAffectsReturnValue) {
// Test that a single pointer argument can directly require uniformity as well as affecting the
// uniformity of the return value.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> arr : array<u32>;
fn bar(p : ptr<storage, array<u32>, read_write>) -> u32 {
// This requires `p` to always be uniform.
if (arrayLength(p) == 10) {
workgroupBarrier();
}
// This requires the contents of `p` to be uniform in order for the return value to be uniform.
return (*p)[0];
}
fn foo() {
let p = &arr;
// We pass a uniform pointer, so the direct uniformity requirement on the parameter is satisfied.
if (0 == bar(p)) {
// This will fail as the return value of `p` is non-uniform due to non-uniform contents of `p`.
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:19:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:17:3 note: control flow depends on possibly non-uniform value
if (0 == bar(p)) {
^^
test:17:12 note: return value of 'bar' may be non-uniform
if (0 == bar(p)) {
^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, WorkgroupUniformLoad) {
std::string src = R"(
const wgsize = 4;
var<workgroup> data : array<u32, wgsize>;
@compute @workgroup_size(wgsize)
fn main(@builtin(local_invocation_index) idx : u32) {
data[idx] = idx + 1;
if (workgroupUniformLoad(&data[0]) > 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, WorkgroupUniformLoad_ViaPtrArg) {
std::string src = R"(
const wgsize = 4;
var<workgroup> data : array<u32, wgsize>;
fn foo(p : ptr<workgroup, u32>) -> u32 {
return workgroupUniformLoad(p);
}
@compute @workgroup_size(wgsize)
fn main(@builtin(local_invocation_index) idx : u32) {
data[idx] = idx + 1;
if (foo(&data[0]) > 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, WorkgroupUniformLoad_NonUniformPtr) {
std::string src = R"(
const wgsize = 4;
var<workgroup> data : array<u32, wgsize>;
@compute @workgroup_size(wgsize)
fn main(@builtin(local_invocation_index) idx : u32) {
data[idx] = idx + 1;
if (workgroupUniformLoad(&data[idx]) > 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:28 error: 'workgroupUniformLoad' requires argument 0 to be uniform
if (workgroupUniformLoad(&data[idx]) > 0) {
^^^^^^^^^^
test:8:34 note: builtin 'idx' of 'main' may be non-uniform
if (workgroupUniformLoad(&data[idx]) > 0) {
^^^
)");
}
TEST_F(UniformityAnalysisTest, WorkgroupUniformLoad_NonUniformPtr_ViaPtrArg) {
std::string src = R"(
const wgsize = 4;
var<workgroup> data : array<u32, wgsize>;
fn foo(p : ptr<workgroup, u32>) -> u32 {
return workgroupUniformLoad(p);
}
@compute @workgroup_size(wgsize)
fn main(@builtin(local_invocation_index) idx : u32) {
data[idx] = idx + 1;
if (foo(&data[idx]) > 0) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:31 error: 'workgroupUniformLoad' requires argument 0 to be uniform
return workgroupUniformLoad(p);
^
test:6:31 note: parameter 'p' of 'foo' may be non-uniform
return workgroupUniformLoad(p);
^
test:12:11 note: possibly non-uniform value passed here
if (foo(&data[idx]) > 0) {
^^^^^^^^^^
test:12:17 note: builtin 'idx' of 'main' may be non-uniform
if (foo(&data[idx]) > 0) {
^^^
)");
}
TEST_F(UniformityAnalysisTest, WorkgroupAtomics) {
std::string src = R"(
var<workgroup> a : atomic<i32>;
fn foo() {
if (atomicAdd(&a, 1) == 1) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (atomicAdd(&a, 1) == 1) {
^^
test:5:7 note: return value of 'atomicAdd' may be non-uniform
if (atomicAdd(&a, 1) == 1) {
^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, StorageAtomics) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> a : atomic<i32>;
fn foo() {
if (atomicAdd(&a, 1) == 1) {
storageBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'storageBarrier' must only be called from uniform control flow
storageBarrier();
^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (atomicAdd(&a, 1) == 1) {
^^
test:5:7 note: return value of 'atomicAdd' may be non-uniform
if (atomicAdd(&a, 1) == 1) {
^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, StorageTextureLoad_ReadOnly) {
std::string src = R"(
@group(0) @binding(0) var t : texture_storage_2d<r32sint, read>;
fn foo() {
if (textureLoad(t, vec2()).r == 0) {
storageBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, StorageTextureLoad_ReadWrite) {
std::string src = R"(
@group(0) @binding(0) var t : texture_storage_2d<r32sint, read_write>;
fn foo() {
if (textureLoad(t, vec2()).r == 0) {
storageBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'storageBarrier' must only be called from uniform control flow
storageBarrier();
^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (textureLoad(t, vec2()).r == 0) {
^^
test:5:7 note: return value of 'textureLoad' may be non-uniform
if (textureLoad(t, vec2()).r == 0) {
^^^^^^^^^^^^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, DisableAnalysisWithExtension) {
std::string src = R"(
enable chromium_disable_uniformity_analysis;
@group(0) @binding(0) var<storage, read_write> rw : i32;
fn foo() {
if (rw == 0) {
workgroupBarrier();
}
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, StressGraphTraversalDepth) {
// Create a function with a very long sequence of variable declarations and assignments to
// test traversals of very deep graphs. This requires a non-recursive traversal algorithm.
ProgramBuilder b;
auto& ty = b.ty;
// var<private> v0 : i32 = 0i;
// fn foo() {
// let v1 = v0;
// let v2 = v1;
// ...
// let v{N} = v{N-1};
// if (v{N} == 0) {
// workgroupBarrier();
// }
// }
b.GlobalVar("v0", ty.i32(), core::AddressSpace::kPrivate, b.Expr(0_i));
Vector<const ast::Statement*, 8> foo_body;
std::string v_last = "v0";
for (int i = 1; i < 100000; i++) {
auto v = "v" + std::to_string(i);
foo_body.Push(b.Decl(b.Var(v, b.Expr(v_last))));
v_last = v;
}
foo_body.Push(b.If(b.Equal(v_last, 0_i), b.Block(b.CallStmt(b.Call("workgroupBarrier")))));
b.Func("foo", tint::Empty, ty.void_(), foo_body);
RunTest(std::move(b), false);
EXPECT_EQ(error_,
R"(error: 'workgroupBarrier' must only be called from uniform control flow
note: control flow depends on possibly non-uniform value
note: reading from module-scope private variable 'v0' may result in a non-uniform value)");
}
////////////////////////////////////////////////////////////////////////////////
/// Tests for diagnostic filter rules.
////////////////////////////////////////////////////////////////////////////////
class UniformityAnalysisDiagnosticFilterTest
: public UniformityAnalysisTestBase,
public ::testing::TestWithParam<wgsl::DiagnosticSeverity> {
protected:
// TODO(jrprice): Remove this in favour of tint::ToString() when we change "note" to "info".
const char* ToStr(wgsl::DiagnosticSeverity severity) {
switch (severity) {
case wgsl::DiagnosticSeverity::kError:
return "error";
case wgsl::DiagnosticSeverity::kWarning:
return "warning";
case wgsl::DiagnosticSeverity::kInfo:
return "note";
default:
return "<undefined>";
}
}
};
// Test each diagnostic rule against directives and attributes on functions.
TEST_P(UniformityAnalysisDiagnosticFilterTest, Directive_DerivativeUniformity) {
auto& param = GetParam();
StringStream ss;
ss << "diagnostic(" << param << ", derivative_uniformity);" << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
if (non_uniform == 42) {
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, Directive_SubgroupUniformity) {
auto& param = GetParam();
StringStream ss;
ss << "enable subgroups;\n"
<< "diagnostic(" << param << ", subgroup_uniformity);" << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
_ = subgroupElect();
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'subgroupElect' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnFunction_DerivativeUniformity) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
)" << "@diagnostic("
<< param << ", derivative_uniformity)" <<
R"(fn foo() {
if (non_uniform == 42) {
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnFunction_SubgroupUniformity) {
auto& param = GetParam();
StringStream ss;
ss << R"(
enable subgroups;
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
)" << "@diagnostic("
<< param << ", subgroup_uniformity)" <<
R"(fn foo() {
if (non_uniform == 42) {
_ = subgroupElect();
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'subgroupElect' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
// Test the various places that the attributes can be used against just one diagnostic rule, to
// avoid over-parameterizing the tests.
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnBlock) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
if (non_uniform == 42))"
<< "@diagnostic(" << param << ", derivative_uniformity)" << R"({
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnForStatement_CallInInitializer) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)"
<< R"(for (var b = (non_uniform == 42 && dpdx(1.0) > 0.0); false;) {
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnForStatement_CallInCondition) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(for (; non_uniform == 42 && dpdx(1.0) > 0.0;) {
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnForStatement_CallInIncrement) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)"
<< R"(for (var b = false; false; b = (non_uniform == 42 && dpdx(1.0) > 0.0)) {
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnForStatement_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(for (; non_uniform == 42;) {
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnIfStatement_CallInCondition) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(if (non_uniform == 42 && dpdx(1.0) > 0.0) {
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnIfStatement_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(if (non_uniform == 42) {
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnIfStatement_CallInElse) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(if (non_uniform == 42) {
} else {
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnLoopStatement_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(loop {
_ = dpdx(1.0);
continuing {
break if non_uniform == 0;
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnLoopStatement_CallInContinuing) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(loop {
continuing {
_ = dpdx(1.0);
break if non_uniform == 0;
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnLoopBody_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
loop )"
<< "@diagnostic(" << param << ", derivative_uniformity)" << R"( {
_ = dpdx(1.0);
continuing {
break if non_uniform == 0;
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnLoopBody_CallInContinuing) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
loop )"
<< "@diagnostic(" << param << ", derivative_uniformity)" << R"( {
continuing {
_ = dpdx(1.0);
break if non_uniform == 0;
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnLoopContinuing_CallInContinuing) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
loop {
continuing )"
<< "@diagnostic(" << param << ", derivative_uniformity)" << R"( {
_ = dpdx(1.0);
break if non_uniform == 0;
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnSwitchStatement_CallInCondition) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)"
<< R"(switch (i32(non_uniform == 42 && dpdx(1.0) > 0.0)) {
default {}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnSwitchStatement_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(switch (non_uniform) {
default {
let color = textureSample(t, s, vec2(0, 0));
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnSwitchBody_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
switch (non_uniform))"
<< "@diagnostic(" << param << ", derivative_uniformity)" << R"( {
default {
let color = textureSample(t, s, vec2(0, 0));
}
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnWhileStatement_CallInCondition) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(while (non_uniform == 42 && dpdx(1.0) > 0.0) {
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'dpdx' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
TEST_P(UniformityAnalysisDiagnosticFilterTest, AttributeOnWhileStatement_CallInBody) {
auto& param = GetParam();
StringStream ss;
ss << R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@group(0) @binding(1) var t : texture_2d<f32>;
@group(0) @binding(2) var s : sampler;
fn foo() {
)" << "@diagnostic("
<< param << ", derivative_uniformity)" << R"(while (non_uniform == 42) {
let color = textureSample(t, s, vec2(0, 0));
}
}
)";
RunTest(ss.str(), param != wgsl::DiagnosticSeverity::kError);
if (param == wgsl::DiagnosticSeverity::kOff) {
EXPECT_TRUE(error_.empty());
} else {
StringStream err;
err << ToStr(param) << ": 'textureSample' must only be called";
EXPECT_THAT(error_, ::testing::HasSubstr(err.str()));
}
}
INSTANTIATE_TEST_SUITE_P(UniformityAnalysisTest,
UniformityAnalysisDiagnosticFilterTest,
::testing::Values(wgsl::DiagnosticSeverity::kError,
wgsl::DiagnosticSeverity::kWarning,
wgsl::DiagnosticSeverity::kInfo,
wgsl::DiagnosticSeverity::kOff));
TEST_F(UniformityAnalysisDiagnosticFilterTest, AttributeOnFunction_CalledByAnotherFunction) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@diagnostic(info, derivative_uniformity)
fn bar() {
_ = dpdx(1.0);
}
fn foo() {
if (non_uniform == 42) {
bar();
}
}
)";
RunTest(src, true);
EXPECT_THAT(error_, ::testing::HasSubstr("note: 'dpdx' must only be called"));
}
TEST_F(UniformityAnalysisDiagnosticFilterTest, AttributeOnFunction_RequirementOnParameter) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
@diagnostic(info, derivative_uniformity)
fn bar(x : i32) {
if (x == 0) {
_ = dpdx(1.0);
}
}
fn foo() {
bar(non_uniform);
}
)";
RunTest(src, true);
EXPECT_THAT(error_, ::testing::HasSubstr("note: 'dpdx' must only be called"));
}
TEST_F(UniformityAnalysisDiagnosticFilterTest, AttributeOnFunction_BuiltinInChildCall) {
// Make sure that the diagnostic filter does not descend into functions called by the function
// with the attribute.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn bar() {
_ = dpdx(1.0);
}
@diagnostic(off, derivative_uniformity)
fn foo() {
if (non_uniform == 42) {
bar();
}
}
)";
RunTest(src, false);
EXPECT_THAT(error_, ::testing::HasSubstr(": 'dpdx' must only be called"));
}
TEST_F(UniformityAnalysisDiagnosticFilterTest, MixOfGlobalAndLocalFilters) {
// Test that a global filter is overridden by a local attribute, and that we find multiple
// violations until an error is found.
std::string src = R"(
diagnostic(info, derivative_uniformity);
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn a() {
if (non_uniform == 42) {
_ = dpdx(1.0);
}
}
@diagnostic(off, derivative_uniformity)
fn b() {
if (non_uniform == 42) {
_ = dpdx(1.0);
}
}
@diagnostic(info, derivative_uniformity)
fn c() {
if (non_uniform == 42) {
_ = dpdx(1.0);
}
}
@diagnostic(warning, derivative_uniformity)
fn d() {
if (non_uniform == 42) {
_ = dpdx(1.0);
}
}
@diagnostic(error, derivative_uniformity)
fn e() {
if (non_uniform == 42) {
_ = dpdx(1.0);
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:9 note: 'dpdx' must only be called from uniform control flow
_ = dpdx(1.0);
^^^^^^^^^
test:7:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:7:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
test:22:9 note: 'dpdx' must only be called from uniform control flow
_ = dpdx(1.0);
^^^^^^^^^
test:21:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:21:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
test:29:9 warning: 'dpdx' must only be called from uniform control flow
_ = dpdx(1.0);
^^^^^^^^^
test:28:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:28:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
test:36:9 error: 'dpdx' must only be called from uniform control flow
_ = dpdx(1.0);
^^^^^^^^^
test:35:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:35:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisDiagnosticFilterTest, BuiltinReturnValueNotAffected) {
// Make sure that a diagnostic filter does not affect the uniformity of the return value of a
// derivative builtin.
std::string src = R"(
fn foo() {
var x: f32;
@diagnostic(off,derivative_uniformity) {
x = dpdx(1.0);
}
if (x < 0.5) {
_ = dpdy(1.0); // Should trigger an error
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:10:9 error: 'dpdy' must only be called from uniform control flow
_ = dpdy(1.0); // Should trigger an error
^^^^^^^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (x < 0.5) {
^^
test:6:9 note: return value of 'dpdx' may be non-uniform
x = dpdx(1.0);
^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisDiagnosticFilterTest,
ParameterRequiredToBeUniform_With_ParameterRequiredToBeUniformForReturnValue) {
// Make sure that both requirements on parameters are captured.
std::string src = R"(
@diagnostic(info,derivative_uniformity)
fn foo(x : bool) -> bool {
if (x) {
_ = dpdx(1.0); // Should trigger an info
}
return x;
}
var<private> non_uniform: bool;
@diagnostic(error,derivative_uniformity)
fn bar() {
let ret = foo(non_uniform);
if (ret) {
_ = dpdy(1.0); // Should trigger an error
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:9 error: 'dpdy' must only be called from uniform control flow
_ = dpdy(1.0); // Should trigger an error
^^^^^^^^^
test:15:3 note: control flow depends on possibly non-uniform value
if (ret) {
^^
test:14:17 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
let ret = foo(non_uniform);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisDiagnosticFilterTest, BarriersNotAffected) {
// Make sure that the diagnostic filter does not affect barriers.
std::string src = R"(
diagnostic(off, derivative_uniformity);
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
_ = dpdx(1.0);
}
}
fn bar() {
if (non_uniform == 42) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:13:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// Tests for the quality of the error messages produced by the analysis.
////////////////////////////////////////////////////////////////////////////////
TEST_F(UniformityAnalysisTest, Error_CallUserThatCallsBuiltinDirectly) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
workgroupBarrier();
}
fn main() {
if (non_uniform == 42) {
foo();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:5:3 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:5 note: called by 'foo' from 'main'
foo();
^^^
test:9:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:9:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Error_CallUserThatCallsBuiltinIndirectly) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn zoo() {
workgroupBarrier();
}
fn bar() {
zoo();
}
fn foo() {
bar();
}
fn main() {
if (non_uniform == 42) {
foo();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:5:3 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:18:5 note: called indirectly by 'foo' from 'main'
foo();
^^^
test:17:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:17:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Error_ParametersRequireUniformityInChain) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn zoo(a : i32) {
if (a == 42) {
workgroupBarrier();
}
}
fn bar(b : i32) {
zoo(b);
}
fn foo(c : i32) {
bar(c);
}
fn main() {
foo(non_uniform);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on possibly non-uniform value
if (a == 42) {
^^
test:4:8 note: parameter 'a' of 'zoo' may be non-uniform
fn zoo(a : i32) {
^
test:11:7 note: possibly non-uniform value passed here
zoo(b);
^
test:11:7 note: parameter 'b' of 'bar' may be non-uniform
zoo(b);
^
test:15:7 note: possibly non-uniform value passed here
bar(c);
^
test:15:7 note: parameter 'c' of 'foo' may be non-uniform
bar(c);
^
test:19:7 note: possibly non-uniform value passed here
foo(non_uniform);
^^^^^^^^^^^
test:19:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
foo(non_uniform);
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Error_ReturnValueMayBeNonUniformChain) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn zoo() -> i32 {
return non_uniform;
}
fn bar() -> i32 {
return zoo();
}
fn foo() -> i32 {
return bar();
}
fn main() {
if (foo() == 42) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:18:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:17:3 note: control flow depends on possibly non-uniform value
if (foo() == 42) {
^^
test:17:7 note: return value of 'foo' may be non-uniform
if (foo() == 42) {
^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Error_CallsiteAndParameterRequireUniformity) {
// Test that we report a violation for the callsite of a function when it has multiple
// uniformity requirements.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo(v : i32) {
if (v == 0) {
workgroupBarrier();
}
}
fn main() {
if (non_uniform == 42) {
foo(0);
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:6:5 error: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:5 note: called by 'foo' from 'main'
foo(0);
^^^
test:11:3 note: control flow depends on possibly non-uniform value
if (non_uniform == 42) {
^^
test:11:7 note: reading from read_write storage buffer 'non_uniform' may result in a non-uniform value
if (non_uniform == 42) {
^^^^^^^^^^^
)");
}
TEST_F(UniformityAnalysisTest, Error_PointerParameterContentsRequiresUniformity_AfterControlFlow) {
// Test that we can find the correct source of uniformity inside a function called with a
// pointer parameter, when the pointer contents is used after control flow that introduces extra
// nodes for merging the pointer contents.
std::string src = R"(
var<private> non_uniform : i32;
fn foo(p : ptr<function, i32>) {
for (var i = 0; i < 3; i++) {
continue;
}
if (*p == 0) {
return;
}
_ = dpdx(1.0);
}
fn main() {
var f = non_uniform;
foo(&f);
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:11:7 error: 'dpdx' must only be called from uniform control flow
_ = dpdx(1.0);
^^^^^^^^^
test:8:3 note: control flow depends on possibly non-uniform value
if (*p == 0) {
^^
test:4:8 note: parameter 'p' of 'foo' may point to a non-uniform value
fn foo(p : ptr<function, i32>) {
^
test:16:7 note: possibly non-uniform value passed via pointer here
foo(&f);
^^
test:15:11 note: reading from module-scope private variable 'non_uniform' may result in a non-uniform value
var f = non_uniform;
^^^^^^^^^^^
)");
}
} // namespace
} // namespace tint::resolver