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// 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/remove_block_reduction_opportunity_finder.h"
#include "source/opt/build_module.h"
#include "source/reduce/reduction_opportunity.h"
#include "test/reduce/reduce_test_util.h"
namespace spvtools {
namespace reduce {
namespace {
TEST(RemoveBlockReductionPassTest, BasicCheck) {
std::string shader = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %4 "main"
OpExecutionMode %4 OriginUpperLeft
OpSource ESSL 310
OpName %4 "main"
OpName %8 "x"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%6 = OpTypeInt 32 1
%7 = OpTypePointer Function %6
%9 = OpConstant %6 1
%10 = OpConstant %6 2
%11 = OpConstant %6 3
%12 = OpConstant %6 4
%4 = OpFunction %2 None %3
%5 = OpLabel
%8 = OpVariable %7 Function
OpBranch %14
%13 = OpLabel ; unreachable
OpStore %8 %9
OpBranch %14
%14 = OpLabel
OpStore %8 %10
OpBranch %16
%15 = OpLabel ; unreachable
OpStore %8 %11
OpBranch %16
%16 = OpLabel
OpStore %8 %12
OpBranch %17
%17 = OpLabel
OpReturn
OpFunctionEnd
)";
const auto env = SPV_ENV_UNIVERSAL_1_3;
const auto consumer = nullptr;
const auto context =
BuildModule(env, consumer, shader, kReduceAssembleOption);
const auto ops =
RemoveBlockReductionOpportunityFinder().GetAvailableOpportunities(
context.get(), 0);
ASSERT_EQ(2, ops.size());
ASSERT_TRUE(ops[0]->PreconditionHolds());
ops[0]->TryToApply();
std::string after_op_0 = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %4 "main"
OpExecutionMode %4 OriginUpperLeft
OpSource ESSL 310
OpName %4 "main"
OpName %8 "x"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%6 = OpTypeInt 32 1
%7 = OpTypePointer Function %6
%9 = OpConstant %6 1
%10 = OpConstant %6 2
%11 = OpConstant %6 3
%12 = OpConstant %6 4
%4 = OpFunction %2 None %3
%5 = OpLabel
%8 = OpVariable %7 Function
OpBranch %14
%14 = OpLabel
OpStore %8 %10
OpBranch %16
%15 = OpLabel
OpStore %8 %11
OpBranch %16
%16 = OpLabel
OpStore %8 %12
OpBranch %17
%17 = OpLabel
OpReturn
OpFunctionEnd
)";
CheckEqual(env, after_op_0, context.get());
ASSERT_TRUE(ops[1]->PreconditionHolds());
ops[1]->TryToApply();
std::string after_op_1 = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %4 "main"
OpExecutionMode %4 OriginUpperLeft
OpSource ESSL 310
OpName %4 "main"
OpName %8 "x"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%6 = OpTypeInt 32 1
%7 = OpTypePointer Function %6
%9 = OpConstant %6 1
%10 = OpConstant %6 2
%11 = OpConstant %6 3
%12 = OpConstant %6 4
%4 = OpFunction %2 None %3
%5 = OpLabel
%8 = OpVariable %7 Function
OpBranch %14
%14 = OpLabel
OpStore %8 %10
OpBranch %16
%16 = OpLabel
OpStore %8 %12
OpBranch %17
%17 = OpLabel
OpReturn
OpFunctionEnd
)";
CheckEqual(env, after_op_1, context.get());
}
TEST(RemoveBlockReductionPassTest, UnreachableContinueAndMerge) {
// Loop with unreachable merge and continue target. There should be no
// opportunities.
std::string shader = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %4 "main"
OpExecutionMode %4 OriginUpperLeft
OpSource ESSL 310
OpName %4 "main"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%4 = OpFunction %2 None %3
%5 = OpLabel
OpBranch %13
%13 = OpLabel
OpLoopMerge %16 %15 None
OpBranch %14
%14 = OpLabel
OpReturn
%15 = OpLabel
OpBranch %13
%16 = OpLabel
OpReturn
OpFunctionEnd
)";
const auto env = SPV_ENV_UNIVERSAL_1_3;
const auto consumer = nullptr;
const auto context =
BuildModule(env, consumer, shader, kReduceAssembleOption);
const auto ops =
RemoveBlockReductionOpportunityFinder().GetAvailableOpportunities(
context.get(), 0);
ASSERT_EQ(0, ops.size());
}
TEST(RemoveBlockReductionPassTest, OneBlock) {
// Function with just one block. There should be no opportunities.
std::string shader = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %4 "main"
OpExecutionMode %4 OriginUpperLeft
OpSource ESSL 310
OpName %4 "main"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%4 = OpFunction %2 None %3
%5 = OpLabel
OpReturn
OpFunctionEnd
)";
const auto env = SPV_ENV_UNIVERSAL_1_3;
const auto consumer = nullptr;
const auto context =
BuildModule(env, consumer, shader, kReduceAssembleOption);
const auto ops =
RemoveBlockReductionOpportunityFinder().GetAvailableOpportunities(
context.get(), 0);
ASSERT_EQ(0, ops.size());
}
TEST(RemoveBlockReductionPassTest, UnreachableBlocksWithOutsideIdUses) {
// A function with two unreachable blocks A -> B. A defines ID %9 and B uses
// %9. There are no references to A, but removing A would be invalid because
// of B's use of %9, so there should be no opportunities.
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 = OpTypeInt 32 1
%5 = OpTypeFunction %3
%6 = OpConstant %4 1
%2 = OpFunction %3 None %5
%7 = OpLabel
OpReturn
%8 = OpLabel ; A
%9 = OpUndef %4
OpBranch %10
%10 = OpLabel ; B
%11 = OpIAdd %4 %6 %9 ; uses %9 from A, so A cannot be removed
OpReturn
OpFunctionEnd
)";
const auto env = SPV_ENV_UNIVERSAL_1_3;
const auto consumer = nullptr;
const auto context =
BuildModule(env, consumer, shader, kReduceAssembleOption);
const auto ops =
RemoveBlockReductionOpportunityFinder().GetAvailableOpportunities(
context.get(), 0);
ASSERT_EQ(0, ops.size());
}
TEST(RemoveBlockReductionPassTest, UnreachableBlocksWithInsideIdUses) {
// Similar to the above test.
// A function with two unreachable blocks A -> B. Both blocks create and use
// IDs, but the uses are contained within each block, so A should be removed.
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 = OpTypeInt 32 1
%5 = OpTypeFunction %3
%6 = OpConstant %4 1
%2 = OpFunction %3 None %5
%7 = OpLabel
OpReturn
%8 = OpLabel ; A
%9 = OpUndef %4 ; define %9
%10 = OpIAdd %4 %6 %9 ; use %9
OpBranch %11
%11 = OpLabel ; B
%12 = OpUndef %4 ; define %12
%13 = OpIAdd %4 %6 %12 ; use %12
OpReturn
OpFunctionEnd
)";
const auto env = SPV_ENV_UNIVERSAL_1_3;
const auto consumer = nullptr;
const auto context =
BuildModule(env, consumer, shader, kReduceAssembleOption);
auto ops = RemoveBlockReductionOpportunityFinder().GetAvailableOpportunities(
context.get(), 0);
ASSERT_EQ(1, ops.size());
ASSERT_TRUE(ops[0]->PreconditionHolds());
ops[0]->TryToApply();
// Same as above, but block A is removed.
std::string after_op_0 = 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 = OpTypeInt 32 1
%5 = OpTypeFunction %3
%6 = OpConstant %4 1
%2 = OpFunction %3 None %5
%7 = OpLabel
OpReturn
%11 = OpLabel
%12 = OpUndef %4
%13 = OpIAdd %4 %6 %12
OpReturn
OpFunctionEnd
)";
CheckEqual(env, after_op_0, context.get());
// Find opportunities again. There are no reference to B. B should now be
// removed.
ops = RemoveBlockReductionOpportunityFinder().GetAvailableOpportunities(
context.get(), 0);
ASSERT_EQ(1, ops.size());
ASSERT_TRUE(ops[0]->PreconditionHolds());
ops[0]->TryToApply();
// Same as above, but block B is removed.
std::string after_op_0_again = 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 = OpTypeInt 32 1
%5 = OpTypeFunction %3
%6 = OpConstant %4 1
%2 = OpFunction %3 None %5
%7 = OpLabel
OpReturn
OpFunctionEnd
)";
CheckEqual(env, after_op_0_again, context.get());
}
} // namespace
} // namespace reduce
} // namespace spvtools
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