third_party/SPIRV-Tools/test/fuzz/fuzzer_pass_outline_functions_test.cpp - SwiftShader - Git at Google

 // Copyright (c) 2020 Google LLC
 //
 // 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 "source/fuzz/fuzzer_pass_outline_functions.h"

 #include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "test/fuzz/fuzz_test_util.h"

 namespace spvtools {
 namespace fuzz {
 namespace {

 std::string shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %2 "main"
                OpExecutionMode %2 OriginUpperLeft
                OpSource ESSL 310
                OpName %2 "main"
                OpName %3 "a"
                OpName %4 "b"
                OpDecorate %3 RelaxedPrecision
                OpDecorate %4 RelaxedPrecision
                OpDecorate %5 RelaxedPrecision
                OpDecorate %6 RelaxedPrecision
                OpDecorate %7 RelaxedPrecision
                OpDecorate %8 RelaxedPrecision
                OpDecorate %9 RelaxedPrecision
          %10 = OpTypeVoid
          %11 = OpTypeFunction %10
          %12 = OpTypeInt 32 1
          %13 = OpTypePointer Function %12
          %14 = OpConstant %12 8
          %15 = OpConstant %12 23
          %16 = OpTypeBool
          %17 = OpConstantTrue %16
          %18 = OpConstant %12 0
          %19 = OpConstant %12 1
           %2 = OpFunction %10 None %11
          %20 = OpLabel
           %3 = OpVariable %13 Function
           %4 = OpVariable %13 Function
                OpStore %3 %14
                OpStore %4 %15
                OpBranch %21
          %21 = OpLabel
                OpLoopMerge %22 %23 None
                OpBranch %24
          %24 = OpLabel
          %25 = OpPhi %12 %19 %21 %18 %26
                OpLoopMerge %27 %26 None
                OpBranch %28
          %28 = OpLabel
           %5 = OpLoad %12 %3
          %29 = OpSGreaterThan %16 %5 %18
                OpBranchConditional %29 %30 %27
          %30 = OpLabel
           %6 = OpLoad %12 %4
           %7 = OpISub %12 %6 %19
                OpStore %4 %7
                OpBranch %26
          %26 = OpLabel
           %8 = OpLoad %12 %3
           %9 = OpISub %12 %8 %19
                OpStore %3 %9
                OpBranch %24
          %27 = OpLabel
                OpBranch %23
          %23 = OpLabel
                OpBranch %21
          %22 = OpLabel
                OpBranch %31
          %31 = OpLabel
                OpLoopMerge %32 %31 None
                OpBranchConditional %17 %31 %32
          %32 = OpLabel
                OpSelectionMerge %33 None
                OpBranchConditional %17 %34 %35
          %34 = OpLabel
                OpBranch %33
          %35 = OpLabel
                OpBranch %33
          %33 = OpLabel
          %42 = OpPhi %12 %19 %33 %18 %34 %18 %35
                OpLoopMerge %36 %33 None
                OpBranchConditional %17 %36 %33
          %36 = OpLabel
          %43 = OpPhi %12 %18 %33 %18 %41
                OpReturn
          %37 = OpLabel
                OpLoopMerge %38 %39 None
                OpBranch %40
          %40 = OpLabel
                OpBranchConditional %17 %41 %38
          %41 = OpLabel
                OpBranchConditional %17 %36 %39
          %39 = OpLabel
                OpBranch %37
          %38 = OpLabel
                OpReturn
                OpFunctionEnd
 )";

 TEST(FuzzerPassOutlineFunctionsTest, EntryIsAlreadySuitable) {
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
                                false);
   protobufs::TransformationSequence transformation_sequence;

   FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
                                          &fuzzer_context,
                                          &transformation_sequence, false);

   // Block 28
   auto suitable_entry_block =
       fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
           context->get_instr_block(28));

   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 28);

   // Block 32
   suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
       context->get_instr_block(32));

   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 32);

   // Block 41
   suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
       context->get_instr_block(41));

   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 41);

   // The module should not have been changed.
   ASSERT_TRUE(IsEqual(env, shader, context.get()));
 }

 TEST(FuzzerPassOutlineFunctionsTest, EntryHasOpVariable) {
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
                                false);
   protobufs::TransformationSequence transformation_sequence;

   FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
                                          &fuzzer_context,
                                          &transformation_sequence, false);

   // Block 20
   auto suitable_entry_block =
       fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
           context->get_instr_block(20));

   // The block should have been split, the new entry block being the block
   // generated by the splitting.
   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 100);

   std::string after_adjustment = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %2 "main"
                OpExecutionMode %2 OriginUpperLeft
                OpSource ESSL 310
                OpName %2 "main"
                OpName %3 "a"
                OpName %4 "b"
                OpDecorate %3 RelaxedPrecision
                OpDecorate %4 RelaxedPrecision
                OpDecorate %5 RelaxedPrecision
                OpDecorate %6 RelaxedPrecision
                OpDecorate %7 RelaxedPrecision
                OpDecorate %8 RelaxedPrecision
                OpDecorate %9 RelaxedPrecision
          %10 = OpTypeVoid
          %11 = OpTypeFunction %10
          %12 = OpTypeInt 32 1
          %13 = OpTypePointer Function %12
          %14 = OpConstant %12 8
          %15 = OpConstant %12 23
          %16 = OpTypeBool
          %17 = OpConstantTrue %16
          %18 = OpConstant %12 0
          %19 = OpConstant %12 1
           %2 = OpFunction %10 None %11
          %20 = OpLabel
           %3 = OpVariable %13 Function
           %4 = OpVariable %13 Function
                OpBranch %100
         %100 = OpLabel
                OpStore %3 %14
                OpStore %4 %15
                OpBranch %21
          %21 = OpLabel
                OpLoopMerge %22 %23 None
                OpBranch %24
          %24 = OpLabel
          %25 = OpPhi %12 %19 %21 %18 %26
                OpLoopMerge %27 %26 None
                OpBranch %28
          %28 = OpLabel
           %5 = OpLoad %12 %3
          %29 = OpSGreaterThan %16 %5 %18
                OpBranchConditional %29 %30 %27
          %30 = OpLabel
           %6 = OpLoad %12 %4
           %7 = OpISub %12 %6 %19
                OpStore %4 %7
                OpBranch %26
          %26 = OpLabel
           %8 = OpLoad %12 %3
           %9 = OpISub %12 %8 %19
                OpStore %3 %9
                OpBranch %24
          %27 = OpLabel
                OpBranch %23
          %23 = OpLabel
                OpBranch %21
          %22 = OpLabel
                OpBranch %31
          %31 = OpLabel
                OpLoopMerge %32 %31 None
                OpBranchConditional %17 %31 %32
          %32 = OpLabel
                OpSelectionMerge %33 None
                OpBranchConditional %17 %34 %35
          %34 = OpLabel
                OpBranch %33
          %35 = OpLabel
                OpBranch %33
          %33 = OpLabel
          %42 = OpPhi %12 %19 %33 %18 %34 %18 %35
                OpLoopMerge %36 %33 None
                OpBranchConditional %17 %36 %33
          %36 = OpLabel
          %43 = OpPhi %12 %18 %33 %18 %41
                OpReturn
          %37 = OpLabel
                OpLoopMerge %38 %39 None
                OpBranch %40
          %40 = OpLabel
                OpBranchConditional %17 %41 %38
          %41 = OpLabel
                OpBranchConditional %17 %36 %39
          %39 = OpLabel
                OpBranch %37
          %38 = OpLabel
                OpReturn
                OpFunctionEnd
 )";

   ASSERT_TRUE(IsEqual(env, after_adjustment, context.get()));
 }

 TEST(FuzzerPassOutlineFunctionsTest, EntryBlockIsHeader) {
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
                                false);
   protobufs::TransformationSequence transformation_sequence;

   FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
                                          &fuzzer_context,
                                          &transformation_sequence, false);

   // Block 21
   auto suitable_entry_block =
       fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
           context->get_instr_block(21));

   // A suitable entry block should have been found by finding the preheader
   // (%20) and then splitting it.
   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 100);

   // Block 24
   suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
       context->get_instr_block(24));

   // A preheader should have been created, because the current one is a loop
   // header.
   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 101);

   // Block 31
   suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
       context->get_instr_block(31));

   // An existing suitable entry block should have been found by finding the
   // preheader (%22), which is already suitable.
   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 22);

   // Block 33
   suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
       context->get_instr_block(33));

   // An existing suitable entry block should have been found by creating a new
   // preheader (there is not one already), and then splitting it (as it contains
   // OpPhi).
   ASSERT_TRUE(suitable_entry_block);
   ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 104);

   // Block 37
   suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
       context->get_instr_block(37));

   // No suitable entry block can be found for block 37, since it is a loop
   // header with only one predecessor (the back-edge block).
   ASSERT_FALSE(suitable_entry_block);

   std::string after_adjustments = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %2 "main"
                OpExecutionMode %2 OriginUpperLeft
                OpSource ESSL 310
                OpName %2 "main"
                OpName %3 "a"
                OpName %4 "b"
                OpDecorate %3 RelaxedPrecision
                OpDecorate %4 RelaxedPrecision
                OpDecorate %5 RelaxedPrecision
                OpDecorate %6 RelaxedPrecision
                OpDecorate %7 RelaxedPrecision
                OpDecorate %8 RelaxedPrecision
                OpDecorate %9 RelaxedPrecision
          %10 = OpTypeVoid
          %11 = OpTypeFunction %10
          %12 = OpTypeInt 32 1
          %13 = OpTypePointer Function %12
          %14 = OpConstant %12 8
          %15 = OpConstant %12 23
          %16 = OpTypeBool
          %17 = OpConstantTrue %16
          %18 = OpConstant %12 0
          %19 = OpConstant %12 1
           %2 = OpFunction %10 None %11
          %20 = OpLabel
           %3 = OpVariable %13 Function
           %4 = OpVariable %13 Function
                OpBranch %100
         %100 = OpLabel
                OpStore %3 %14
                OpStore %4 %15
                OpBranch %21
          %21 = OpLabel
                OpLoopMerge %22 %23 None
                OpBranch %101
         %101 = OpLabel
                OpBranch %24
          %24 = OpLabel
          %25 = OpPhi %12 %19 %101 %18 %26
                OpLoopMerge %27 %26 None
                OpBranch %28
          %28 = OpLabel
           %5 = OpLoad %12 %3
          %29 = OpSGreaterThan %16 %5 %18
                OpBranchConditional %29 %30 %27
          %30 = OpLabel
           %6 = OpLoad %12 %4
           %7 = OpISub %12 %6 %19
                OpStore %4 %7
                OpBranch %26
          %26 = OpLabel
           %8 = OpLoad %12 %3
           %9 = OpISub %12 %8 %19
                OpStore %3 %9
                OpBranch %24
          %27 = OpLabel
                OpBranch %23
          %23 = OpLabel
                OpBranch %21
          %22 = OpLabel
                OpBranch %31
          %31 = OpLabel
                OpLoopMerge %32 %31 None
                OpBranchConditional %17 %31 %32
          %32 = OpLabel
                OpSelectionMerge %102 None
                OpBranchConditional %17 %34 %35
          %34 = OpLabel
                OpBranch %102
          %35 = OpLabel
                OpBranch %102
         %102 = OpLabel
         %103 = OpPhi %12 %18 %34 %18 %35
                OpBranch %104
         %104 = OpLabel
                OpBranch %33
          %33 = OpLabel
          %42 = OpPhi %12 %103 %104 %19 %33
                OpLoopMerge %36 %33 None
                OpBranchConditional %17 %36 %33
          %36 = OpLabel
          %43 = OpPhi %12 %18 %33 %18 %41
                OpReturn
          %37 = OpLabel
                OpLoopMerge %38 %39 None
                OpBranch %40
          %40 = OpLabel
                OpBranchConditional %17 %41 %38
          %41 = OpLabel
                OpBranchConditional %17 %36 %39
          %39 = OpLabel
                OpBranch %37
          %38 = OpLabel
                OpReturn
                OpFunctionEnd
 )";

   ASSERT_TRUE(IsEqual(env, after_adjustments, context.get()));
 }

 TEST(FuzzerPassOutlineFunctionsTest, ExitBlock) {
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
                                false);
   protobufs::TransformationSequence transformation_sequence;

   FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
                                          &fuzzer_context,
                                          &transformation_sequence, false);

   // Block 39 is not a merge block, so it is already suitable.
   auto suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
       context->get_instr_block(39));
   ASSERT_TRUE(suitable_exit_block);
   ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 39);

   // The following are merge blocks and, thus, they will need to be split.

   // Block 22
   suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
       context->get_instr_block(22));
   ASSERT_TRUE(suitable_exit_block);
   ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 100);

   // Block 27
   suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
       context->get_instr_block(27));
   ASSERT_TRUE(suitable_exit_block);
   ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 101);

   // Block 36
   suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
       context->get_instr_block(36));
   ASSERT_TRUE(suitable_exit_block);
   ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 102);

   std::string after_adjustments = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %2 "main"
                OpExecutionMode %2 OriginUpperLeft
                OpSource ESSL 310
                OpName %2 "main"
                OpName %3 "a"
                OpName %4 "b"
                OpDecorate %3 RelaxedPrecision
                OpDecorate %4 RelaxedPrecision
                OpDecorate %5 RelaxedPrecision
                OpDecorate %6 RelaxedPrecision
                OpDecorate %7 RelaxedPrecision
                OpDecorate %8 RelaxedPrecision
                OpDecorate %9 RelaxedPrecision
          %10 = OpTypeVoid
          %11 = OpTypeFunction %10
          %12 = OpTypeInt 32 1
          %13 = OpTypePointer Function %12
          %14 = OpConstant %12 8
          %15 = OpConstant %12 23
          %16 = OpTypeBool
          %17 = OpConstantTrue %16
          %18 = OpConstant %12 0
          %19 = OpConstant %12 1
           %2 = OpFunction %10 None %11
          %20 = OpLabel
           %3 = OpVariable %13 Function
           %4 = OpVariable %13 Function
                OpStore %3 %14
                OpStore %4 %15
                OpBranch %21
          %21 = OpLabel
                OpLoopMerge %22 %23 None
                OpBranch %24
          %24 = OpLabel
          %25 = OpPhi %12 %19 %21 %18 %26
                OpLoopMerge %27 %26 None
                OpBranch %28
          %28 = OpLabel
           %5 = OpLoad %12 %3
          %29 = OpSGreaterThan %16 %5 %18
                OpBranchConditional %29 %30 %27
          %30 = OpLabel
           %6 = OpLoad %12 %4
           %7 = OpISub %12 %6 %19
                OpStore %4 %7
                OpBranch %26
          %26 = OpLabel
           %8 = OpLoad %12 %3
           %9 = OpISub %12 %8 %19
                OpStore %3 %9
                OpBranch %24
          %27 = OpLabel
                OpBranch %101
         %101 = OpLabel
                OpBranch %23
          %23 = OpLabel
                OpBranch %21
          %22 = OpLabel
                OpBranch %100
         %100 = OpLabel
                OpBranch %31
          %31 = OpLabel
                OpLoopMerge %32 %31 None
                OpBranchConditional %17 %31 %32
          %32 = OpLabel
                OpSelectionMerge %33 None
                OpBranchConditional %17 %34 %35
          %34 = OpLabel
                OpBranch %33
          %35 = OpLabel
                OpBranch %33
          %33 = OpLabel
          %42 = OpPhi %12 %19 %33 %18 %34 %18 %35
                OpLoopMerge %36 %33 None
                OpBranchConditional %17 %36 %33
          %36 = OpLabel
          %43 = OpPhi %12 %18 %33 %18 %41
                OpBranch %102
         %102 = OpLabel
                OpReturn
          %37 = OpLabel
                OpLoopMerge %38 %39 None
                OpBranch %40
          %40 = OpLabel
                OpBranchConditional %17 %41 %38
          %41 = OpLabel
                OpBranchConditional %17 %36 %39
          %39 = OpLabel
                OpBranch %37
          %38 = OpLabel
                OpReturn
                OpFunctionEnd
 )";

   ASSERT_TRUE(IsEqual(env, after_adjustments, context.get()));
 }
 }  // namespace
 }  // namespace fuzz
 }  // namespace spvtools
	// Copyright (c) 2020 Google LLC
	//
	// 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 "source/fuzz/fuzzer_pass_outline_functions.h"

	#include "gtest/gtest.h"
	#include "source/fuzz/fuzzer_util.h"
	#include "source/fuzz/pseudo_random_generator.h"
	#include "test/fuzz/fuzz_test_util.h"

	namespace spvtools {
	namespace fuzz {
	namespace {

	std::string shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %2 "main"
	OpExecutionMode %2 OriginUpperLeft
	OpSource ESSL 310
	OpName %2 "main"
	OpName %3 "a"
	OpName %4 "b"
	OpDecorate %3 RelaxedPrecision
	OpDecorate %4 RelaxedPrecision
	OpDecorate %5 RelaxedPrecision
	OpDecorate %6 RelaxedPrecision
	OpDecorate %7 RelaxedPrecision
	OpDecorate %8 RelaxedPrecision
	OpDecorate %9 RelaxedPrecision
	%10 = OpTypeVoid
	%11 = OpTypeFunction %10
	%12 = OpTypeInt 32 1
	%13 = OpTypePointer Function %12
	%14 = OpConstant %12 8
	%15 = OpConstant %12 23
	%16 = OpTypeBool
	%17 = OpConstantTrue %16
	%18 = OpConstant %12 0
	%19 = OpConstant %12 1
	%2 = OpFunction %10 None %11
	%20 = OpLabel
	%3 = OpVariable %13 Function
	%4 = OpVariable %13 Function
	OpStore %3 %14
	OpStore %4 %15
	OpBranch %21
	%21 = OpLabel
	OpLoopMerge %22 %23 None
	OpBranch %24
	%24 = OpLabel
	%25 = OpPhi %12 %19 %21 %18 %26
	OpLoopMerge %27 %26 None
	OpBranch %28
	%28 = OpLabel
	%5 = OpLoad %12 %3
	%29 = OpSGreaterThan %16 %5 %18
	OpBranchConditional %29 %30 %27
	%30 = OpLabel
	%6 = OpLoad %12 %4
	%7 = OpISub %12 %6 %19
	OpStore %4 %7
	OpBranch %26
	%26 = OpLabel
	%8 = OpLoad %12 %3
	%9 = OpISub %12 %8 %19
	OpStore %3 %9
	OpBranch %24
	%27 = OpLabel
	OpBranch %23
	%23 = OpLabel
	OpBranch %21
	%22 = OpLabel
	OpBranch %31
	%31 = OpLabel
	OpLoopMerge %32 %31 None
	OpBranchConditional %17 %31 %32
	%32 = OpLabel
	OpSelectionMerge %33 None
	OpBranchConditional %17 %34 %35
	%34 = OpLabel
	OpBranch %33
	%35 = OpLabel
	OpBranch %33
	%33 = OpLabel
	%42 = OpPhi %12 %19 %33 %18 %34 %18 %35
	OpLoopMerge %36 %33 None
	OpBranchConditional %17 %36 %33
	%36 = OpLabel
	%43 = OpPhi %12 %18 %33 %18 %41
	OpReturn
	%37 = OpLabel
	OpLoopMerge %38 %39 None
	OpBranch %40
	%40 = OpLabel
	OpBranchConditional %17 %41 %38
	%41 = OpLabel
	OpBranchConditional %17 %36 %39
	%39 = OpLabel
	OpBranch %37
	%38 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	TEST(FuzzerPassOutlineFunctionsTest, EntryIsAlreadySuitable) {
	const auto env = SPV_ENV_UNIVERSAL_1_5;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
	false);
	protobufs::TransformationSequence transformation_sequence;

	FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
	&fuzzer_context,
	&transformation_sequence, false);

	// Block 28
	auto suitable_entry_block =
	fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(28));

	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 28);

	// Block 32
	suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(32));

	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 32);

	// Block 41
	suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(41));

	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 41);

	// The module should not have been changed.
	ASSERT_TRUE(IsEqual(env, shader, context.get()));
	}

	TEST(FuzzerPassOutlineFunctionsTest, EntryHasOpVariable) {
	const auto env = SPV_ENV_UNIVERSAL_1_5;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
	false);
	protobufs::TransformationSequence transformation_sequence;

	FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
	&fuzzer_context,
	&transformation_sequence, false);

	// Block 20
	auto suitable_entry_block =
	fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(20));

	// The block should have been split, the new entry block being the block
	// generated by the splitting.
	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 100);

	std::string after_adjustment = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %2 "main"
	OpExecutionMode %2 OriginUpperLeft
	OpSource ESSL 310
	OpName %2 "main"
	OpName %3 "a"
	OpName %4 "b"
	OpDecorate %3 RelaxedPrecision
	OpDecorate %4 RelaxedPrecision
	OpDecorate %5 RelaxedPrecision
	OpDecorate %6 RelaxedPrecision
	OpDecorate %7 RelaxedPrecision
	OpDecorate %8 RelaxedPrecision
	OpDecorate %9 RelaxedPrecision
	%10 = OpTypeVoid
	%11 = OpTypeFunction %10
	%12 = OpTypeInt 32 1
	%13 = OpTypePointer Function %12
	%14 = OpConstant %12 8
	%15 = OpConstant %12 23
	%16 = OpTypeBool
	%17 = OpConstantTrue %16
	%18 = OpConstant %12 0
	%19 = OpConstant %12 1
	%2 = OpFunction %10 None %11
	%20 = OpLabel
	%3 = OpVariable %13 Function
	%4 = OpVariable %13 Function
	OpBranch %100
	%100 = OpLabel
	OpStore %3 %14
	OpStore %4 %15
	OpBranch %21
	%21 = OpLabel
	OpLoopMerge %22 %23 None
	OpBranch %24
	%24 = OpLabel
	%25 = OpPhi %12 %19 %21 %18 %26
	OpLoopMerge %27 %26 None
	OpBranch %28
	%28 = OpLabel
	%5 = OpLoad %12 %3
	%29 = OpSGreaterThan %16 %5 %18
	OpBranchConditional %29 %30 %27
	%30 = OpLabel
	%6 = OpLoad %12 %4
	%7 = OpISub %12 %6 %19
	OpStore %4 %7
	OpBranch %26
	%26 = OpLabel
	%8 = OpLoad %12 %3
	%9 = OpISub %12 %8 %19
	OpStore %3 %9
	OpBranch %24
	%27 = OpLabel
	OpBranch %23
	%23 = OpLabel
	OpBranch %21
	%22 = OpLabel
	OpBranch %31
	%31 = OpLabel
	OpLoopMerge %32 %31 None
	OpBranchConditional %17 %31 %32
	%32 = OpLabel
	OpSelectionMerge %33 None
	OpBranchConditional %17 %34 %35
	%34 = OpLabel
	OpBranch %33
	%35 = OpLabel
	OpBranch %33
	%33 = OpLabel
	%42 = OpPhi %12 %19 %33 %18 %34 %18 %35
	OpLoopMerge %36 %33 None
	OpBranchConditional %17 %36 %33
	%36 = OpLabel
	%43 = OpPhi %12 %18 %33 %18 %41
	OpReturn
	%37 = OpLabel
	OpLoopMerge %38 %39 None
	OpBranch %40
	%40 = OpLabel
	OpBranchConditional %17 %41 %38
	%41 = OpLabel
	OpBranchConditional %17 %36 %39
	%39 = OpLabel
	OpBranch %37
	%38 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	ASSERT_TRUE(IsEqual(env, after_adjustment, context.get()));
	}

	TEST(FuzzerPassOutlineFunctionsTest, EntryBlockIsHeader) {
	const auto env = SPV_ENV_UNIVERSAL_1_5;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
	false);
	protobufs::TransformationSequence transformation_sequence;

	FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
	&fuzzer_context,
	&transformation_sequence, false);

	// Block 21
	auto suitable_entry_block =
	fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(21));

	// A suitable entry block should have been found by finding the preheader
	// (%20) and then splitting it.
	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 100);

	// Block 24
	suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(24));

	// A preheader should have been created, because the current one is a loop
	// header.
	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 101);

	// Block 31
	suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(31));

	// An existing suitable entry block should have been found by finding the
	// preheader (%22), which is already suitable.
	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 22);

	// Block 33
	suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(33));

	// An existing suitable entry block should have been found by creating a new
	// preheader (there is not one already), and then splitting it (as it contains
	// OpPhi).
	ASSERT_TRUE(suitable_entry_block);
	ASSERT_TRUE(suitable_entry_block->GetLabel()->result_id() == 104);

	// Block 37
	suitable_entry_block = fuzzer_pass.MaybeGetEntryBlockSuitableForOutlining(
	context->get_instr_block(37));

	// No suitable entry block can be found for block 37, since it is a loop
	// header with only one predecessor (the back-edge block).
	ASSERT_FALSE(suitable_entry_block);

	std::string after_adjustments = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %2 "main"
	OpExecutionMode %2 OriginUpperLeft
	OpSource ESSL 310
	OpName %2 "main"
	OpName %3 "a"
	OpName %4 "b"
	OpDecorate %3 RelaxedPrecision
	OpDecorate %4 RelaxedPrecision
	OpDecorate %5 RelaxedPrecision
	OpDecorate %6 RelaxedPrecision
	OpDecorate %7 RelaxedPrecision
	OpDecorate %8 RelaxedPrecision
	OpDecorate %9 RelaxedPrecision
	%10 = OpTypeVoid
	%11 = OpTypeFunction %10
	%12 = OpTypeInt 32 1
	%13 = OpTypePointer Function %12
	%14 = OpConstant %12 8
	%15 = OpConstant %12 23
	%16 = OpTypeBool
	%17 = OpConstantTrue %16
	%18 = OpConstant %12 0
	%19 = OpConstant %12 1
	%2 = OpFunction %10 None %11
	%20 = OpLabel
	%3 = OpVariable %13 Function
	%4 = OpVariable %13 Function
	OpBranch %100
	%100 = OpLabel
	OpStore %3 %14
	OpStore %4 %15
	OpBranch %21
	%21 = OpLabel
	OpLoopMerge %22 %23 None
	OpBranch %101
	%101 = OpLabel
	OpBranch %24
	%24 = OpLabel
	%25 = OpPhi %12 %19 %101 %18 %26
	OpLoopMerge %27 %26 None
	OpBranch %28
	%28 = OpLabel
	%5 = OpLoad %12 %3
	%29 = OpSGreaterThan %16 %5 %18
	OpBranchConditional %29 %30 %27
	%30 = OpLabel
	%6 = OpLoad %12 %4
	%7 = OpISub %12 %6 %19
	OpStore %4 %7
	OpBranch %26
	%26 = OpLabel
	%8 = OpLoad %12 %3
	%9 = OpISub %12 %8 %19
	OpStore %3 %9
	OpBranch %24
	%27 = OpLabel
	OpBranch %23
	%23 = OpLabel
	OpBranch %21
	%22 = OpLabel
	OpBranch %31
	%31 = OpLabel
	OpLoopMerge %32 %31 None
	OpBranchConditional %17 %31 %32
	%32 = OpLabel
	OpSelectionMerge %102 None
	OpBranchConditional %17 %34 %35
	%34 = OpLabel
	OpBranch %102
	%35 = OpLabel
	OpBranch %102
	%102 = OpLabel
	%103 = OpPhi %12 %18 %34 %18 %35
	OpBranch %104
	%104 = OpLabel
	OpBranch %33
	%33 = OpLabel
	%42 = OpPhi %12 %103 %104 %19 %33
	OpLoopMerge %36 %33 None
	OpBranchConditional %17 %36 %33
	%36 = OpLabel
	%43 = OpPhi %12 %18 %33 %18 %41
	OpReturn
	%37 = OpLabel
	OpLoopMerge %38 %39 None
	OpBranch %40
	%40 = OpLabel
	OpBranchConditional %17 %41 %38
	%41 = OpLabel
	OpBranchConditional %17 %36 %39
	%39 = OpLabel
	OpBranch %37
	%38 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	ASSERT_TRUE(IsEqual(env, after_adjustments, context.get()));
	}

	TEST(FuzzerPassOutlineFunctionsTest, ExitBlock) {
	const auto env = SPV_ENV_UNIVERSAL_1_5;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	FuzzerContext fuzzer_context(MakeUnique<PseudoRandomGenerator>(0), 100,
	false);
	protobufs::TransformationSequence transformation_sequence;

	FuzzerPassOutlineFunctions fuzzer_pass(context.get(), &transformation_context,
	&fuzzer_context,
	&transformation_sequence, false);

	// Block 39 is not a merge block, so it is already suitable.
	auto suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
	context->get_instr_block(39));
	ASSERT_TRUE(suitable_exit_block);
	ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 39);

	// The following are merge blocks and, thus, they will need to be split.

	// Block 22
	suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
	context->get_instr_block(22));
	ASSERT_TRUE(suitable_exit_block);
	ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 100);

	// Block 27
	suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
	context->get_instr_block(27));
	ASSERT_TRUE(suitable_exit_block);
	ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 101);

	// Block 36
	suitable_exit_block = fuzzer_pass.MaybeGetExitBlockSuitableForOutlining(
	context->get_instr_block(36));
	ASSERT_TRUE(suitable_exit_block);
	ASSERT_TRUE(suitable_exit_block->GetLabel()->result_id() == 102);

	std::string after_adjustments = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %2 "main"
	OpExecutionMode %2 OriginUpperLeft
	OpSource ESSL 310
	OpName %2 "main"
	OpName %3 "a"
	OpName %4 "b"
	OpDecorate %3 RelaxedPrecision
	OpDecorate %4 RelaxedPrecision
	OpDecorate %5 RelaxedPrecision
	OpDecorate %6 RelaxedPrecision
	OpDecorate %7 RelaxedPrecision
	OpDecorate %8 RelaxedPrecision
	OpDecorate %9 RelaxedPrecision
	%10 = OpTypeVoid
	%11 = OpTypeFunction %10
	%12 = OpTypeInt 32 1
	%13 = OpTypePointer Function %12
	%14 = OpConstant %12 8
	%15 = OpConstant %12 23
	%16 = OpTypeBool
	%17 = OpConstantTrue %16
	%18 = OpConstant %12 0
	%19 = OpConstant %12 1
	%2 = OpFunction %10 None %11
	%20 = OpLabel
	%3 = OpVariable %13 Function
	%4 = OpVariable %13 Function
	OpStore %3 %14
	OpStore %4 %15
	OpBranch %21
	%21 = OpLabel
	OpLoopMerge %22 %23 None
	OpBranch %24
	%24 = OpLabel
	%25 = OpPhi %12 %19 %21 %18 %26
	OpLoopMerge %27 %26 None
	OpBranch %28
	%28 = OpLabel
	%5 = OpLoad %12 %3
	%29 = OpSGreaterThan %16 %5 %18
	OpBranchConditional %29 %30 %27
	%30 = OpLabel
	%6 = OpLoad %12 %4
	%7 = OpISub %12 %6 %19
	OpStore %4 %7
	OpBranch %26
	%26 = OpLabel
	%8 = OpLoad %12 %3
	%9 = OpISub %12 %8 %19
	OpStore %3 %9
	OpBranch %24
	%27 = OpLabel
	OpBranch %101
	%101 = OpLabel
	OpBranch %23
	%23 = OpLabel
	OpBranch %21
	%22 = OpLabel
	OpBranch %100
	%100 = OpLabel
	OpBranch %31
	%31 = OpLabel
	OpLoopMerge %32 %31 None
	OpBranchConditional %17 %31 %32
	%32 = OpLabel
	OpSelectionMerge %33 None
	OpBranchConditional %17 %34 %35
	%34 = OpLabel
	OpBranch %33
	%35 = OpLabel
	OpBranch %33
	%33 = OpLabel
	%42 = OpPhi %12 %19 %33 %18 %34 %18 %35
	OpLoopMerge %36 %33 None
	OpBranchConditional %17 %36 %33
	%36 = OpLabel
	%43 = OpPhi %12 %18 %33 %18 %41
	OpBranch %102
	%102 = OpLabel
	OpReturn
	%37 = OpLabel
	OpLoopMerge %38 %39 None
	OpBranch %40
	%40 = OpLabel
	OpBranchConditional %17 %41 %38
	%41 = OpLabel
	OpBranchConditional %17 %36 %39
	%39 = OpLabel
	OpBranch %37
	%38 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	ASSERT_TRUE(IsEqual(env, after_adjustments, context.get()));
	}
	} // namespace
	} // namespace fuzz
	} // namespace spvtools