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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include "src/tint/program_builder.h"
#include "src/tint/reader/wgsl/parser.h"
#include "src/tint/resolver/uniformity.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
using namespace tint::number_suffixes; // NOLINT
namespace tint::resolver {
namespace {
class UniformityAnalysisTestBase {
protected:
/// 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) {
auto file = std::make_unique<Source::File>("test", src);
auto program = reader::wgsl::Parse(file.get());
diag::Formatter::Style style;
style.print_newline_at_end = false;
error_ = diag::Formatter(style).format(program.Diagnostics());
bool valid = program.IsValid();
if (should_pass) {
EXPECT_TRUE(valid) << error_;
if (program.Diagnostics().count() == 1u) {
EXPECT_THAT(program.Diagnostics().str(), ::testing::HasSubstr("unreachable"));
} else {
EXPECT_EQ(program.Diagnostics().count(), 0u) << error_;
}
} else {
// TODO(jrprice): expect false when uniformity issues become errors.
EXPECT_TRUE(valid) << error_;
}
}
/// Build and resolve a program from a ProgramBuilder object.
/// @param builder the program builder
/// @returns true on success, false on failure
bool RunTest(ProgramBuilder&& builder) {
auto program = Program(std::move(builder));
diag::Formatter::Style style;
style.print_newline_at_end = false;
error_ = diag::Formatter(style).format(program.Diagnostics());
return program.IsValid();
}
/// 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,
kModuleLet,
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,
kTextureSample,
kTextureSampleBias,
kTextureSampleCompare,
kDpdx,
kDpdxCoarse,
kDpdxFine,
kDpdy,
kDpdyCoarse,
kDpdyFine,
kFwidth,
kFwidthCoarse,
kFwidthFine,
// 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 kModuleLet:
return "module_let == 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 FunctionToStr(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 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 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(kModuleLet);
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(kTextureSample);
CASE(kTextureSampleBias);
CASE(kTextureSampleCompare);
CASE(kDpdx);
CASE(kDpdxCoarse);
CASE(kDpdxFine);
CASE(kDpdy);
CASE(kDpdyCoarse);
CASE(kDpdyFine);
CASE(kFwidth);
CASE(kFwidthCoarse);
CASE(kFwidthFine);
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"(
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;
let module_let : 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"() {
)" + FunctionToStr(function) +
R"(;
}
}
)";
bool should_pass = !(MayBeNonUniform(condition) && RequiredToBeUniform(function));
RunTest(src, should_pass);
if (!should_pass) {
EXPECT_THAT(error_, ::testing::StartsWith("test:31:5 warning: "));
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, SubsequentControlFlowMayBeNonUniform_Pass) {
// Call a function that causes subsequent control flow to be non-uniform, and then call another
// function that doesn't require uniformity.
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 bar() {
if (p == 42) {
p = 7;
}
}
fn main() {
foo();
bar();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, SubsequentControlFlowMayBeNonUniform_Fail) {
// Call a function that causes subsequent control flow to be non-uniform, and then call another
// function that requires uniformity.
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, false);
EXPECT_EQ(error_,
R"(test:17:3 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:16:3 note: calling 'foo' may cause subsequent control flow to be non-uniform
foo();
^^^
test:7:3 note: control flow depends on non-uniform value
if (rw == 0) {
^^
test:7:7 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
if (rw == 0) {
^^
)");
}
TEST_F(UniformityAnalysisTest, SubsequentControlFlowMayBeNonUniform_Nested_Fail) {
// Indirectly call a function that causes subsequent control flow to be non-uniform, and then
// call another function that requires uniformity.
// The lack of return statement in `foo()` requires that we implicitly add an edge from
// CF_return to that last control flow node of the function.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
var<private> p : i32;
fn bar() {
if (rw == 0) {
p = 42;
return;
}
p = 5;
return;
}
fn foo() {
bar();
}
fn main() {
foo();
workgroupBarrier();
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:21:3 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:20:3 note: calling 'foo' may cause subsequent control flow to be non-uniform
foo();
^^^
test:16:3 note: calling 'bar' may cause subsequent control flow to be non-uniform
bar();
^^^
test:7:3 note: control flow depends on non-uniform value
if (rw == 0) {
^^
test:7:7 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
if (rw == 0) {
^^
)");
}
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:11:7 warning: parameter 'i' of 'foo' must be uniform
foo(rw);
^^
test:6:5 note: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on 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_F(UniformityAnalysisTest, ParameterRequiredToBeUniformForSubsequentControlFlow_Pass) {
// Pass a uniform value as an argument to a function that uses that parameter return early, and
// then invoke a barrier after calling that function.
std::string src = R"(
@group(0) @binding(0) var<storage, read> ro : i32;
var<private> p : i32;
fn foo(i : i32) {
if (i == 0) {
p = 42;
return;
}
p = 5;
return;
}
fn bar() {
foo(ro);
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, ParameterRequiredToBeUniformForSubsequentControlFlow_Fail) {
// Pass a non-uniform value as an argument to a function that uses that parameter return early,
// and then invoke a barrier after calling that function.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> rw : i32;
var<private> p : i32;
fn foo(i : i32) {
if (i == 0) {
p = 42;
return;
}
p = 5;
return;
}
fn bar() {
foo(rw);
workgroupBarrier();
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:17:3 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:16:7 note: non-uniform function call argument causes subsequent control flow to be non-uniform
foo(rw);
^^
test:7:3 note: control flow depends on non-uniform value
if (i == 0) {
^^
test:7:7 note: reading from 'i' may result in a non-uniform value
if (i == 0) {
^
test:16:7 note: reading from read_write storage buffer 'rw' may result in a non-uniform value
foo(rw);
^^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// 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 = 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:4:3 note: control flow depends on non-uniform value
if (all(vec3(b) == vec3(0u))) {
^^
test:4:16 note: reading from builtin 'b' may result in a non-uniform value
if (all(vec3(b) == vec3(0u))) {
^
)");
}
}
TEST_P(ComputeBuiltin, InStruct) {
std::string src = 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:3 note: control flow depends on non-uniform value
if (all(vec3(s.b) == vec3(0u))) {
^^
test:8:16 note: reading from 's' may result in a non-uniform value
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}),
[](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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on non-uniform value
if (s.num_groups.x == 0u) {
^^
test:9:7 note: reading from 's' may result in a non-uniform value
if (s.num_groups.x == 0u) {
^
)");
}
class FragmentBuiltin : public UniformityAnalysisTestBase,
public ::testing::TestWithParam<BuiltinEntry> {};
TEST_P(FragmentBuiltin, AsParam) {
std::string src = 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:5:5 warning: 'dpdx' must only be called from uniform control flow
dpdx(0.5);
^^^^
test:4:3 note: control flow depends on non-uniform value
if (u32(vec4(b).x) == 0u) {
^^
test:4:16 note: reading from builtin 'b' may result in a non-uniform value
if (u32(vec4(b).x) == 0u) {
^
)");
}
}
TEST_P(FragmentBuiltin, InStruct) {
std::string src = 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:9:5 warning: 'dpdx' must only be called from uniform control flow
dpdx(0.5);
^^^^
test:8:3 note: control flow depends on non-uniform value
if (u32(vec4(s.b).x) == 0u) {
^^
test:8:16 note: reading from 's' may result in a non-uniform value
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}),
[](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:5:5 warning: 'dpdx' must only be called from uniform control flow
dpdx(0.5);
^^^^
test:4:3 note: control flow depends on non-uniform value
if (l == 0.0) {
^^
test:4:7 note: reading from user-defined input 'l' may result in a non-uniform value
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:9:5 warning: 'dpdx' must only be called from uniform control flow
dpdx(0.5);
^^^^
test:8:3 note: control flow depends on non-uniform value
if (s.l == 0.0) {
^^
test:8:7 note: reading from 's' may result in a non-uniform value
if (s.l == 0.0) {
^
)");
}
////////////////////////////////////////////////////////////////////////////////
/// Test loop conditions and conditional break/continue statements.
////////////////////////////////////////////////////////////////////////////////
namespace LoopTest {
enum ControlFlowInterrupt {
kBreak,
kContinue,
kReturn,
kDiscard,
};
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";
case kDiscard:
return "discard";
}
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, kDiscard + 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 warning: '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 warning: '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 warning: '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;
if (i == n) {
break;
}
}
}
}
)";
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;
if (i == n) {
break;
}
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:7:5 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:7 note: control flow depends on non-uniform value
if (i == n) {
^^
test:10:16 note: reading from read_write storage buffer 'n' may result in a non-uniform value
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;
if (i == n) {
break;
}
}
}
}
)";
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;
if (i == n) {
break;
}
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:8:7 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:10:7 note: control flow depends on non-uniform value
if (i == n) {
^^
test:10:16 note: reading from read_write storage buffer 'n' may result in a non-uniform value
if (i == n) {
^
)");
}
class LoopDeadCodeTest : public UniformityAnalysisTestBase, public ::testing::TestWithParam<int> {};
INSTANTIATE_TEST_SUITE_P(UniformityAnalysisTest,
LoopDeadCodeTest,
::testing::Range<int>(0, kDiscard + 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.
if (false) {
break;
}
}
}
}
)";
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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:5 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:19:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:19:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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();
}
if (true) {
break;
}
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:16:9 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:15:7 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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_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, Loop_NonUniformFunctionInBody_Reconverge) {
// Loops reconverge at exit, so test that we can call workgroupBarrier() after a loop that
// contains a call to a function that causes non-uniform control flow.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn bar() {
if (n == 42) {
return;
} else {
return;
}
}
fn foo() {
loop {
bar();
break;
}
workgroupBarrier();
}
)";
RunTest(src, true);
}
TEST_F(UniformityAnalysisTest, Loop_NonUniformFunctionDiscard_NoReconvergence) {
// Loops should not reconverge after non-uniform discard statements.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn bar() {
if (n == 42) {
discard;
}
}
fn foo() {
loop {
bar();
break;
}
workgroupBarrier();
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:15:3 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:5 note: calling 'bar' may cause subsequent control flow to be non-uniform
bar();
^^^
test:5:3 note: control flow depends on non-uniform value
if (n == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'n' may result in a non-uniform value
if (n == 42) {
^
)");
}
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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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_CallInside_InitializerCausesNonUniformFlow) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn bar() -> i32 {
if (n == 42) {
return 1;
} else {
return 2;
}
}
fn foo() {
for (var i = bar(); i < 10; i = i + 1) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:16 note: calling 'bar' may cause subsequent control flow to be non-uniform
for (var i = bar(); i < 10; i = i + 1) {
^^^
test:5:3 note: control flow depends on non-uniform value
if (n == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'n' may result in a non-uniform value
if (n == 42) {
^
)");
}
TEST_F(UniformityAnalysisTest, ForLoop_CallInside_ContinuingCausesNonUniformFlow) {
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> n : i32;
fn bar() -> i32 {
if (n == 42) {
return 1;
} else {
return 2;
}
}
fn foo() {
for (var i = 0; i < 10; i = i + bar()) {
workgroupBarrier();
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:5 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:13:35 note: calling 'bar' may cause subsequent control flow to be non-uniform
for (var i = 0; i < 10; i = i + bar()) {
^^^
test:5:3 note: control flow depends on non-uniform value
if (n == 42) {
^^
test:5:7 note: reading from read_write storage buffer 'n' may result in a non-uniform value
if (n == 42) {
^
)");
}
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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:9:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:20:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:5 note: control flow depends on 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_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);
}
} // 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:34 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:34 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:7:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:14:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:11:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:12:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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_NonUniformDiscard_NoReconverge) {
// If statements should not reconverge after non-uniform discards.
std::string src = R"(
@group(0) @binding(0) var<storage, read_write> non_uniform : i32;
fn foo() {
if (non_uniform == 42) {
discard;
} else {
}
workgroupBarrier();
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:9:3 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:5:3 note: control flow depends on 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 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:7 note: control flow depends on 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_NonUniformBreakInDifferentCase_Fallthrough) {
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;
}
fallthrough;
}
case 42: {
workgroupBarrier();
}
default: {
}
}
}
)";
RunTest(src, false);
EXPECT_EQ(error_,
R"(test:14:7 warning: 'workgroupBarrier' must only be called from uniform control flow
workgroupBarrier();
^^^^^^^^^^^^^^^^
test:8:7 note: control flow depends on 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_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