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// Copyright 2023 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.
#include "src/tint/lang/spirv/writer/common/helper_test.h"
using namespace tint::core::number_suffixes; // NOLINT
namespace tint::spirv::writer {
namespace {
TEST_F(SpirvWriterTest, Loop_BreakIf) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Body(), [&] { //
b.Continue(loop);
b.Append(loop->Continuing(), [&] { //
b.BreakIf(loop, true);
});
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpBranch %6
%6 = OpLabel
OpBranchConditional %true %8 %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
// Test that we still emit the continuing block with a back-edge, even when it is unreachable.
TEST_F(SpirvWriterTest, Loop_UnconditionalBreakInBody) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Body(), [&] { //
b.ExitLoop(loop);
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpBranch %8
%6 = OpLabel
OpBranch %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_ConditionalBreakInBody) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Body(), [&] {
auto* cond_break = b.If(true);
b.Append(cond_break->True(), [&] { //
b.ExitLoop(loop);
});
b.Append(cond_break->False(), [&] { //
b.ExitIf(cond_break);
});
b.Continue(loop);
b.Append(loop->Continuing(), [&] { //
b.NextIteration(loop);
});
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpSelectionMerge %9 None
OpBranchConditional %true %10 %9
%10 = OpLabel
OpBranch %8
%9 = OpLabel
OpBranch %6
%6 = OpLabel
OpBranch %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_ConditionalContinueInBody) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Body(), [&] {
auto* cond_break = b.If(true);
b.Append(cond_break->True(), [&] { //
b.Continue(loop);
});
b.Append(cond_break->False(), [&] { //
b.ExitIf(cond_break);
});
b.ExitLoop(loop);
b.Append(loop->Continuing(), [&] { //
b.NextIteration(loop);
});
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpSelectionMerge %9 None
OpBranchConditional %true %10 %9
%10 = OpLabel
OpBranch %6
%9 = OpLabel
OpBranch %8
%6 = OpLabel
OpBranch %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
// Test that we still emit the continuing block with a back-edge, and the merge block, even when
// they are unreachable.
TEST_F(SpirvWriterTest, Loop_UnconditionalReturnInBody) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Body(), [&] { //
b.Return(func);
});
b.Unreachable();
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpBranch %8
%6 = OpLabel
OpBranch %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_UseResultFromBodyInContinuing) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Body(), [&] {
auto* result = b.Equal(ty.bool_(), 1_i, 2_i);
b.Continue(loop, result);
b.Append(loop->Continuing(), [&] { //
b.BreakIf(loop, result);
});
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
%9 = OpIEqual %bool %int_1 %int_2
OpBranch %6
%6 = OpLabel
OpBranchConditional %9 %8 %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_NestedLoopInBody) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* outer_loop = b.Loop();
b.Append(outer_loop->Body(), [&] {
auto* inner_loop = b.Loop();
b.Append(inner_loop->Body(), [&] {
b.ExitLoop(inner_loop);
b.Append(inner_loop->Continuing(), [&] { //
b.NextIteration(inner_loop);
});
});
b.Continue(outer_loop);
b.Append(outer_loop->Continuing(),
[&] { //
b.BreakIf(outer_loop, true);
});
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpBranch %11
%11 = OpLabel
OpLoopMerge %12 %10 None
OpBranch %9
%9 = OpLabel
OpBranch %12
%10 = OpLabel
OpBranch %11
%12 = OpLabel
OpBranch %6
%6 = OpLabel
OpBranchConditional %true %8 %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_NestedLoopInContinuing) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* outer_loop = b.Loop();
b.Append(outer_loop->Body(), [&] {
b.Continue(outer_loop);
b.Append(outer_loop->Continuing(), [&] {
auto* inner_loop = b.Loop();
b.Append(inner_loop->Body(), [&] {
b.Continue(inner_loop);
b.Append(inner_loop->Continuing(), [&] { //
b.BreakIf(inner_loop, true);
});
});
b.BreakIf(outer_loop, true);
});
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %7
%7 = OpLabel
OpLoopMerge %8 %6 None
OpBranch %5
%5 = OpLabel
OpBranch %6
%6 = OpLabel
OpBranch %11
%11 = OpLabel
OpLoopMerge %12 %10 None
OpBranch %9
%9 = OpLabel
OpBranch %10
%10 = OpLabel
OpBranchConditional %true %12 %11
%12 = OpLabel
OpBranchConditional %true %8 %7
%8 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_Phi_SingleValue) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Initializer(), [&] { //
b.NextIteration(loop, 1_i);
});
auto* loop_param = b.BlockParam(ty.i32());
loop->Body()->SetParams({loop_param});
b.Append(loop->Body(), [&] {
auto* inc = b.Add(ty.i32(), loop_param, 1_i);
b.Continue(loop, inc);
});
auto* cont_param = b.BlockParam(ty.i32());
loop->Continuing()->SetParams({cont_param});
b.Append(loop->Continuing(), [&] {
auto* cmp = b.GreaterThan(ty.bool_(), cont_param, 5_i);
b.BreakIf(loop, cmp, cont_param);
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%5 = OpLabel
OpBranch %8
%8 = OpLabel
%11 = OpPhi %int %int_1 %5 %13 %7
OpLoopMerge %9 %7 None
OpBranch %6
%6 = OpLabel
%14 = OpIAdd %int %11 %int_1
OpBranch %7
%7 = OpLabel
%13 = OpPhi %int %14 %6
%15 = OpSGreaterThan %bool %13 %int_5
OpBranchConditional %15 %9 %8
%9 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_Phi_MultipleValue) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Initializer(), [&] { //
b.NextIteration(loop, 1_i, false);
});
auto* loop_param_a = b.BlockParam(ty.i32());
auto* loop_param_b = b.BlockParam(ty.bool_());
loop->Body()->SetParams({loop_param_a, loop_param_b});
b.Append(loop->Body(), [&] {
auto* inc = b.Add(ty.i32(), loop_param_a, 1_i);
b.Continue(loop, inc, loop_param_b);
});
auto* cont_param_a = b.BlockParam(ty.i32());
auto* cont_param_b = b.BlockParam(ty.bool_());
loop->Continuing()->SetParams({cont_param_a, cont_param_b});
b.Append(loop->Continuing(), [&] {
auto* cmp = b.GreaterThan(ty.bool_(), cont_param_a, 5_i);
auto* not_b = b.Not(ty.bool_(), cont_param_b);
b.BreakIf(loop, cmp, cont_param_a, not_b);
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%5 = OpLabel
OpBranch %8
%8 = OpLabel
%11 = OpPhi %int %int_1 %5 %13 %7
%15 = OpPhi %bool %false %5 %17 %7
OpLoopMerge %9 %7 None
OpBranch %6
%6 = OpLabel
%18 = OpIAdd %int %11 %int_1
OpBranch %7
%7 = OpLabel
%13 = OpPhi %int %18 %6
%19 = OpPhi %bool %15 %6
%20 = OpSGreaterThan %bool %13 %int_5
%17 = OpLogicalEqual %bool %19 %false
OpBranchConditional %20 %9 %8
%9 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_Phi_NestedIf) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* loop = b.Loop();
b.Append(loop->Initializer(), [&] { //
b.NextIteration(loop, 1_i);
});
auto* loop_param = b.BlockParam(ty.i32());
loop->Body()->SetParams({loop_param});
b.Append(loop->Body(), [&] {
auto* inner = b.If(true);
inner->SetResults(b.InstructionResult(ty.i32()));
b.Append(inner->True(), [&] { //
b.ExitIf(inner, 10_i);
});
b.Append(inner->False(), [&] { //
b.ExitIf(inner, 20_i);
});
b.Continue(loop, inner->Result());
});
auto* cont_param = b.BlockParam(ty.i32());
loop->Continuing()->SetParams({cont_param});
b.Append(loop->Continuing(), [&] {
auto* cmp = b.GreaterThan(ty.bool_(), cont_param, 5_i);
b.BreakIf(loop, cmp, cont_param);
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %5
%5 = OpLabel
OpBranch %8
%8 = OpLabel
%11 = OpPhi %int %int_1 %5 %13 %7
OpLoopMerge %9 %7 None
OpBranch %6
%6 = OpLabel
OpSelectionMerge %14 None
OpBranchConditional %true %15 %16
%15 = OpLabel
OpBranch %14
%16 = OpLabel
OpBranch %14
%14 = OpLabel
%19 = OpPhi %int %int_10 %15 %int_20 %16
OpBranch %7
%7 = OpLabel
%13 = OpPhi %int %19 %14
%22 = OpSGreaterThan %bool %13 %int_5
OpBranchConditional %22 %9 %8
%9 = OpLabel
OpReturn
OpFunctionEnd
)");
}
TEST_F(SpirvWriterTest, Loop_Phi_NestedLoop) {
auto* func = b.Function("foo", ty.void_());
b.Append(func->Block(), [&] {
auto* outer = b.Loop();
b.Append(outer->Initializer(), [&] { //
b.NextIteration(outer, 1_i);
});
auto* outer_param = b.BlockParam(ty.i32());
outer->Body()->SetParams({outer_param});
b.Append(outer->Body(), [&] {
auto* inner = b.Loop();
b.Append(inner->Initializer(), [&] { //
b.NextIteration(inner);
});
b.Append(inner->Body(), [&] { //
b.Continue(inner);
});
b.Append(inner->Continuing(), [&] { //
b.BreakIf(inner, true);
});
b.Continue(outer, outer_param);
});
auto* cont_param = b.BlockParam(ty.i32());
outer->Continuing()->SetParams({cont_param});
b.Append(outer->Continuing(), [&] {
auto* cmp = b.GreaterThan(ty.bool_(), cont_param, 5_i);
b.BreakIf(outer, cmp, cont_param);
});
b.Return(func);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%4 = OpLabel
OpBranch %5
%5 = OpLabel
OpBranch %8
%8 = OpLabel
%11 = OpPhi %int %int_1 %5 %13 %7
OpLoopMerge %9 %7 None
OpBranch %6
%6 = OpLabel
OpBranch %14
%14 = OpLabel
OpBranch %17
%17 = OpLabel
OpLoopMerge %18 %16 None
OpBranch %15
%15 = OpLabel
OpBranch %16
%16 = OpLabel
OpBranchConditional %true %18 %17
%18 = OpLabel
OpBranch %7
%7 = OpLabel
%13 = OpPhi %int %11 %18
%21 = OpSGreaterThan %bool %13 %int_5
OpBranchConditional %21 %9 %8
%9 = OpLabel
OpReturn
OpFunctionEnd
)");
}
} // namespace
} // namespace tint::spirv::writer