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// Copyright (c) 2017 Google Inc.
//
// 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 <string>
#include "gmock/gmock.h"
#include "source/opt/value_number_table.h"
#include "test/opt/pass_fixture.h"
#include "test/opt/pass_utils.h"
namespace spvtools {
namespace opt {
namespace {
using ::testing::HasSubstr;
using ::testing::MatchesRegex;
using LocalRedundancyEliminationTest = PassTest<::testing::Test>;
// Remove an instruction when it was already computed.
TEST_F(LocalRedundancyEliminationTest, RemoveRedundantAdd) {
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %2 "main"
OpExecutionMode %2 OriginUpperLeft
OpSource GLSL 430
%3 = OpTypeVoid
%4 = OpTypeFunction %3
%5 = OpTypeFloat 32
%6 = OpTypePointer Function %5
%2 = OpFunction %3 None %4
%7 = OpLabel
%8 = OpVariable %6 Function
%9 = OpLoad %5 %8
%10 = OpFAdd %5 %9 %9
; CHECK: OpFAdd
; CHECK-NOT: OpFAdd
%11 = OpFAdd %5 %9 %9
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LocalRedundancyEliminationPass>(text, false);
}
// Make sure we keep instruction that are different, but look similar.
TEST_F(LocalRedundancyEliminationTest, KeepDifferentAdd) {
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %2 "main"
OpExecutionMode %2 OriginUpperLeft
OpSource GLSL 430
%3 = OpTypeVoid
%4 = OpTypeFunction %3
%5 = OpTypeFloat 32
%6 = OpTypePointer Function %5
%2 = OpFunction %3 None %4
%7 = OpLabel
%8 = OpVariable %6 Function
%9 = OpLoad %5 %8
%10 = OpFAdd %5 %9 %9
; CHECK: OpFAdd
OpStore %8 %10
%11 = OpLoad %5 %8
; CHECK: %11 = OpLoad
%12 = OpFAdd %5 %11 %11
; CHECK: OpFAdd [[:%\w+]] %11 %11
OpReturn
OpFunctionEnd
)";
SetAssembleOptions(SPV_TEXT_TO_BINARY_OPTION_PRESERVE_NUMERIC_IDS);
SinglePassRunAndMatch<LocalRedundancyEliminationPass>(text, false);
}
// This test is check that the values are being propagated properly, and that
// we are able to identify sequences of instruction that are not needed.
TEST_F(LocalRedundancyEliminationTest, RemoveMultipleInstructions) {
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %2 "main"
OpExecutionMode %2 OriginUpperLeft
OpSource GLSL 430
%3 = OpTypeVoid
%4 = OpTypeFunction %3
%5 = OpTypeFloat 32
%6 = OpTypePointer Uniform %5
%8 = OpVariable %6 Uniform
%2 = OpFunction %3 None %4
%7 = OpLabel
; CHECK: [[r1:%\w+]] = OpLoad
%9 = OpLoad %5 %8
; CHECK-NEXT: [[r2:%\w+]] = OpFAdd [[:%\w+]] [[r1]] [[r1]]
%10 = OpFAdd %5 %9 %9
; CHECK-NEXT: [[r3:%\w+]] = OpFMul [[:%\w+]] [[r2]] [[r1]]
%11 = OpFMul %5 %10 %9
; CHECK-NOT: OpLoad
%12 = OpLoad %5 %8
; CHECK-NOT: OpFAdd [[:\w+]] %12 %12
%13 = OpFAdd %5 %12 %12
; CHECK-NOT: OpFMul
%14 = OpFMul %5 %13 %12
; CHECK-NEXT: [[:%\w+]] = OpFAdd [[:%\w+]] [[r3]] [[r3]]
%15 = OpFAdd %5 %14 %11
OpReturn
OpFunctionEnd
)";
SetAssembleOptions(SPV_TEXT_TO_BINARY_OPTION_PRESERVE_NUMERIC_IDS);
SinglePassRunAndMatch<LocalRedundancyEliminationPass>(text, false);
}
// Redundant instructions in different blocks should be kept.
TEST_F(LocalRedundancyEliminationTest, KeepInstructionsInDifferentBlocks) {
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %2 "main"
OpExecutionMode %2 OriginUpperLeft
OpSource GLSL 430
%3 = OpTypeVoid
%4 = OpTypeFunction %3
%5 = OpTypeFloat 32
%6 = OpTypePointer Function %5
%2 = OpFunction %3 None %4
%bb1 = OpLabel
%8 = OpVariable %6 Function
%9 = OpLoad %5 %8
%10 = OpFAdd %5 %9 %9
; CHECK: OpFAdd
OpBranch %bb2
%bb2 = OpLabel
; CHECK: OpFAdd
%11 = OpFAdd %5 %9 %9
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LocalRedundancyEliminationPass>(text, false);
}
TEST_F(LocalRedundancyEliminationTest, StorageBufferIdentification) {
const std::string text = R"(
; CHECK: [[gep:%\w+]] = OpAccessChain
; CHECK: [[ld:%\w+]] = OpLoad {{%\w+}} [[gep]]
; CHECK: [[add:%\w+]] = OpIAdd {{%\w+}} [[ld]]
; CHECK: OpStore [[gep]] [[add]]
; CHECK: [[ld:%\w+]] = OpLoad {{%\w+}} [[gep]]
; CHECK: [[add:%\w+]] = OpIAdd {{%\w+}} [[ld]]
; CHECK: OpStore [[gep]] [[add]]
OpCapability Shader
OpCapability Linkage
OpMemoryModel Logical GLSL450
OpDecorate %block BufferBlock
OpMemberDecorate %block 0 Offset 0
%void = OpTypeVoid
%int = OpTypeInt 32 0
%int_0 = OpConstant %int 0
%int_1 = OpConstant %int 1
%block = OpTypeStruct %int
%array = OpTypeArray %block %int_1
%ptr_ssbo_array = OpTypePointer Uniform %array
%ptr_ssbo_int = OpTypePointer Uniform %int
%var = OpVariable %ptr_ssbo_array Uniform
%void_fn = OpTypeFunction %void
%fn = OpFunction %void None %void_fn
%entry = OpLabel
%gep1 = OpAccessChain %ptr_ssbo_int %var %int_0 %int_0
%ld1 = OpLoad %int %gep1
%add1 = OpIAdd %int %ld1 %int_1
%gep2 = OpAccessChain %ptr_ssbo_int %var %int_0 %int_0
OpStore %gep2 %add1
%gep3 = OpAccessChain %ptr_ssbo_int %var %int_0 %int_0
%ld3 = OpLoad %int %gep3
%add3 = OpIAdd %int %ld3 %int_1
%gep4 = OpAccessChain %ptr_ssbo_int %var %int_0 %int_0
OpStore %gep4 %add3
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LocalRedundancyEliminationPass>(text, true);
}
} // namespace
} // namespace opt
} // namespace spvtools
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