mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-27 02:10:15 +00:00
3335c61147
* Fix #2320. `conditional_branch_to_simple_conditional_branch` reduction pass changes conditional branches so both targets point to the same block id (creating a "simple" conditional branch). * Fix #2501. `simple_conditional_branch_to_branch` reduction pass changes "simple" conditional branches to branches. * Fix #2503. `conditional_branch_to_simple_conditional_branch` proper handling of back-edges.
487 lines
14 KiB
C++
487 lines
14 KiB
C++
// Copyright (c) 2019 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/reduce/simple_conditional_branch_to_branch_opportunity_finder.h"
|
|
|
|
#include "source/opt/build_module.h"
|
|
#include "source/reduce/reduction_opportunity.h"
|
|
#include "source/reduce/reduction_pass.h"
|
|
#include "test/reduce/reduce_test_util.h"
|
|
|
|
namespace spvtools {
|
|
namespace reduce {
|
|
namespace {
|
|
|
|
const spv_target_env kEnv = SPV_ENV_UNIVERSAL_1_3;
|
|
|
|
TEST(SimpleConditionalBranchToBranchTest, Diamond) {
|
|
// A test with the following structure.
|
|
//
|
|
// selection header
|
|
// OpBranchConditional
|
|
// ||
|
|
// b b
|
|
// | |
|
|
// selection merge
|
|
//
|
|
// The conditional branch cannot be simplified because selection headers
|
|
// cannot end with OpBranch.
|
|
|
|
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"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpSelectionMerge %11 None
|
|
OpBranchConditional %8 %12 %12
|
|
%12 = OpLabel
|
|
OpBranch %11
|
|
%13 = OpLabel
|
|
OpBranch %11
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
|
|
)";
|
|
|
|
auto context = BuildModule(kEnv, nullptr, shader, kReduceAssembleOption);
|
|
|
|
CheckValid(kEnv, context.get());
|
|
|
|
auto ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
|
|
ASSERT_EQ(0, ops.size());
|
|
}
|
|
|
|
TEST(SimpleConditionalBranchToBranchTest, DiamondNoSelection) {
|
|
// A test with the following structure.
|
|
//
|
|
// OpBranchConditional
|
|
// ||
|
|
// b b
|
|
// | /
|
|
// b
|
|
//
|
|
// The conditional branch can be simplified.
|
|
|
|
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"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpBranchConditional %8 %12 %12
|
|
%12 = OpLabel
|
|
OpBranch %11
|
|
%13 = OpLabel
|
|
OpBranch %11
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
|
|
auto context = BuildModule(kEnv, nullptr, shader, kReduceAssembleOption);
|
|
|
|
CheckValid(kEnv, context.get());
|
|
|
|
auto ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
|
|
ASSERT_EQ(1, ops.size());
|
|
|
|
ASSERT_TRUE(ops[0]->PreconditionHolds());
|
|
ops[0]->TryToApply();
|
|
CheckValid(kEnv, context.get());
|
|
|
|
std::string after = R"(
|
|
OpCapability Shader
|
|
%1 = OpExtInstImport "GLSL.std.450"
|
|
OpMemoryModel Logical GLSL450
|
|
OpEntryPoint Fragment %2 "main"
|
|
OpExecutionMode %2 OriginUpperLeft
|
|
OpSource ESSL 310
|
|
OpName %2 "main"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpBranch %12
|
|
%12 = OpLabel
|
|
OpBranch %11
|
|
%13 = OpLabel
|
|
OpBranch %11
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
|
|
CheckEqual(kEnv, after, context.get());
|
|
|
|
ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
ASSERT_EQ(0, ops.size());
|
|
}
|
|
|
|
TEST(SimpleConditionalBranchToBranchTest, ConditionalBranchesButNotSimple) {
|
|
// A test with the following structure.
|
|
//
|
|
// selection header
|
|
// OpBranchConditional
|
|
// | |
|
|
// b OpBranchConditional
|
|
// | | |
|
|
// | b |
|
|
// | | |
|
|
// selection merge
|
|
//
|
|
// None of the conditional branches can be simplified; the first is not simple
|
|
// AND part of a selection header; the second is just not simple (where
|
|
// "simple" means it only has one target).
|
|
|
|
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"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpSelectionMerge %11 None
|
|
OpBranchConditional %8 %12 %13
|
|
%12 = OpLabel
|
|
OpBranch %11
|
|
%13 = OpLabel
|
|
OpBranchConditional %8 %14 %11
|
|
%14 = OpLabel
|
|
OpBranch %11
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
|
|
auto context = BuildModule(kEnv, nullptr, shader, kReduceAssembleOption);
|
|
|
|
CheckValid(kEnv, context.get());
|
|
|
|
auto ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
|
|
ASSERT_EQ(0, ops.size());
|
|
}
|
|
|
|
TEST(SimpleConditionalBranchToBranchTest, SimplifyBackEdge) {
|
|
// A test with the following structure. The loop has a continue construct that
|
|
// ends with OpBranchConditional. The OpBranchConditional can be simplified.
|
|
//
|
|
// loop header
|
|
// |
|
|
// loop continue target and back-edge block
|
|
// OpBranchConditional
|
|
// ||
|
|
// loop merge (to loop header^)
|
|
|
|
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"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpLoopMerge %11 %12 None
|
|
OpBranch %12
|
|
%12 = OpLabel
|
|
OpBranchConditional %8 %10 %10
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
|
|
const auto context =
|
|
BuildModule(kEnv, nullptr, shader, kReduceAssembleOption);
|
|
|
|
CheckValid(kEnv, context.get());
|
|
|
|
auto ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
|
|
ASSERT_EQ(1, ops.size());
|
|
|
|
ASSERT_TRUE(ops[0]->PreconditionHolds());
|
|
ops[0]->TryToApply();
|
|
CheckValid(kEnv, context.get());
|
|
|
|
std::string after = R"(
|
|
OpCapability Shader
|
|
%1 = OpExtInstImport "GLSL.std.450"
|
|
OpMemoryModel Logical GLSL450
|
|
OpEntryPoint Fragment %2 "main"
|
|
OpExecutionMode %2 OriginUpperLeft
|
|
OpSource ESSL 310
|
|
OpName %2 "main"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpLoopMerge %11 %12 None
|
|
OpBranch %12
|
|
%12 = OpLabel
|
|
OpBranch %10
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
CheckEqual(kEnv, after, context.get());
|
|
|
|
ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
ASSERT_EQ(0, ops.size());
|
|
}
|
|
|
|
TEST(SimpleConditionalBranchToBranchTest,
|
|
DontRemoveBackEdgeCombinedHeaderContinue) {
|
|
// A test with the following structure.
|
|
//
|
|
// loop header and continue target and back-edge block
|
|
// OpBranchConditional
|
|
// ||
|
|
// loop merge (to loop header^)
|
|
//
|
|
// The conditional branch can be simplified.
|
|
|
|
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"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpLoopMerge %11 %10 None
|
|
OpBranchConditional %8 %10 %10
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
|
|
const auto context =
|
|
BuildModule(kEnv, nullptr, shader, kReduceAssembleOption);
|
|
|
|
CheckValid(kEnv, context.get());
|
|
|
|
auto ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
|
|
ASSERT_EQ(1, ops.size());
|
|
|
|
ASSERT_TRUE(ops[0]->PreconditionHolds());
|
|
ops[0]->TryToApply();
|
|
CheckValid(kEnv, context.get());
|
|
|
|
std::string after = R"(
|
|
OpCapability Shader
|
|
%1 = OpExtInstImport "GLSL.std.450"
|
|
OpMemoryModel Logical GLSL450
|
|
OpEntryPoint Fragment %2 "main"
|
|
OpExecutionMode %2 OriginUpperLeft
|
|
OpSource ESSL 310
|
|
OpName %2 "main"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpLoopMerge %11 %10 None
|
|
OpBranch %10
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
CheckEqual(kEnv, after, context.get());
|
|
|
|
ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
ASSERT_EQ(0, ops.size());
|
|
}
|
|
|
|
TEST(SimpleConditionalBranchToBranchTest, BackEdgeUnreachable) {
|
|
// A test with the following structure. I.e. a loop with an unreachable
|
|
// continue construct that ends with OpBranchConditional.
|
|
//
|
|
// loop header
|
|
// |
|
|
// | loop continue target (unreachable)
|
|
// | |
|
|
// | back-edge block (unreachable)
|
|
// | OpBranchConditional
|
|
// | ||
|
|
// loop merge (to loop header^)
|
|
//
|
|
// The conditional branch can be simplified.
|
|
|
|
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"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpLoopMerge %11 %12 None
|
|
OpBranch %11
|
|
%12 = OpLabel
|
|
OpBranch %13
|
|
%13 = OpLabel
|
|
OpBranchConditional %8 %10 %10
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
|
|
const auto context =
|
|
BuildModule(kEnv, nullptr, shader, kReduceAssembleOption);
|
|
|
|
CheckValid(kEnv, context.get());
|
|
|
|
auto ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
|
|
ASSERT_EQ(1, ops.size());
|
|
|
|
ASSERT_TRUE(ops[0]->PreconditionHolds());
|
|
ops[0]->TryToApply();
|
|
CheckValid(kEnv, context.get());
|
|
|
|
std::string after = R"(
|
|
OpCapability Shader
|
|
%1 = OpExtInstImport "GLSL.std.450"
|
|
OpMemoryModel Logical GLSL450
|
|
OpEntryPoint Fragment %2 "main"
|
|
OpExecutionMode %2 OriginUpperLeft
|
|
OpSource ESSL 310
|
|
OpName %2 "main"
|
|
%3 = OpTypeVoid
|
|
%4 = OpTypeFunction %3
|
|
%5 = OpTypeInt 32 1
|
|
%6 = OpTypePointer Function %5
|
|
%7 = OpTypeBool
|
|
%8 = OpConstantTrue %7
|
|
%2 = OpFunction %3 None %4
|
|
%9 = OpLabel
|
|
OpBranch %10
|
|
%10 = OpLabel
|
|
OpLoopMerge %11 %12 None
|
|
OpBranch %11
|
|
%12 = OpLabel
|
|
OpBranch %13
|
|
%13 = OpLabel
|
|
OpBranch %10
|
|
%11 = OpLabel
|
|
OpReturn
|
|
OpFunctionEnd
|
|
)";
|
|
CheckEqual(kEnv, after, context.get());
|
|
|
|
ops = SimpleConditionalBranchToBranchOpportunityFinder()
|
|
.GetAvailableOpportunities(context.get());
|
|
ASSERT_EQ(0, ops.size());
|
|
}
|
|
|
|
} // namespace
|
|
} // namespace reduce
|
|
} // namespace spvtools
|