mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-10-19 11:30:15 +00:00
5ea7099374
Implements the following simplifications: (a - b) + b => a (a * b) + (a * c) => a * (b + c) Also adds logic to simplification to handle rules that create new operations that might need simplification, such as the second rule above. Only perform the second simplification if the multiplies have the add as their only use. Otherwise this is a deoptimization of size and performance.
366 lines
12 KiB
C++
366 lines
12 KiB
C++
// Copyright (c) 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string>
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#include "gmock/gmock.h"
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#include "source/opt/simplification_pass.h"
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#include "test/opt/assembly_builder.h"
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#include "test/opt/pass_fixture.h"
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namespace spvtools {
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namespace opt {
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namespace {
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using SimplificationTest = PassTest<::testing::Test>;
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TEST_F(SimplificationTest, StraightLineTest) {
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// Testing that folding rules are combined in simple straight line code.
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const std::string text = R"(OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %main "main" %i %o
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OpExecutionMode %main OriginUpperLeft
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OpSource GLSL 430
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OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
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OpSourceExtension "GL_GOOGLE_include_directive"
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OpName %main "main"
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OpName %i "i"
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OpName %o "o"
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OpDecorate %i Flat
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OpDecorate %i Location 0
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OpDecorate %o Location 0
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%void = OpTypeVoid
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%8 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%v4int = OpTypeVector %int 4
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%int_0 = OpConstant %int 0
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%13 = OpConstantComposite %v4int %int_0 %int_0 %int_0 %int_0
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%int_1 = OpConstant %int 1
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%_ptr_Input_v4int = OpTypePointer Input %v4int
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%i = OpVariable %_ptr_Input_v4int Input
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%_ptr_Output_int = OpTypePointer Output %int
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%o = OpVariable %_ptr_Output_int Output
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%main = OpFunction %void None %8
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%21 = OpLabel
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%31 = OpCompositeInsert %v4int %int_1 %13 0
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; CHECK: [[load:%[a-zA-Z_\d]+]] = OpLoad
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%23 = OpLoad %v4int %i
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%33 = OpCompositeInsert %v4int %int_0 %23 0
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%35 = OpCompositeExtract %int %31 0
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; CHECK: [[extract:%[a-zA-Z_\d]+]] = OpCompositeExtract %int [[load]] 1
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%37 = OpCompositeExtract %int %33 1
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; CHECK: [[add:%[a-zA-Z_\d]+]] = OpIAdd %int %int_1 [[extract]]
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%29 = OpIAdd %int %35 %37
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OpStore %o %29
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndMatch<SimplificationPass>(text, false);
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}
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TEST_F(SimplificationTest, NewInstructionTest) {
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// Testing that new instructions are simplified. Specifically,
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// that the new add instruction generated by FactorAddMul is
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// further simplified by MergeGenericAddSub.
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const std::string text = R"(OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %main "main"
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OpExecutionMode %main OriginUpperLeft
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OpSource GLSL 430
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OpName %main "main"
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%void = OpTypeVoid
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%4 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%_ptr_int = OpTypePointer Function %int
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; CHECK: [[mul:%[a-zA-Z_\d]+]] = OpIMul %int %13 %11
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%main = OpFunction %void None %4
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%7 = OpLabel
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%8 = OpVariable %_ptr_int Function
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%9 = OpVariable %_ptr_int Function
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%10 = OpVariable %_ptr_int Function
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%11 = OpLoad %int %8
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%12 = OpLoad %int %9
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%13 = OpLoad %int %10
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%14 = OpISub %int %11 %12
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%15 = OpIMul %int %13 %11
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%16 = OpIMul %int %13 %12
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%17 = OpIAdd %int %14 %15
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndMatch<SimplificationPass>(text, false);
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}
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TEST_F(SimplificationTest, AcrossBasicBlocks) {
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// Testing that folding rules are combined across basic blocks.
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const std::string text = R"(OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %main "main" %i %o
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OpExecutionMode %main OriginUpperLeft
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OpSource GLSL 430
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OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
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OpSourceExtension "GL_GOOGLE_include_directive"
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OpName %main "main"
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OpName %i "i"
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OpName %o "o"
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OpDecorate %i Flat
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OpDecorate %i Location 0
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OpDecorate %o Location 0
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%void = OpTypeVoid
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%8 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%v4int = OpTypeVector %int 4
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%int_0 = OpConstant %int 0
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%_ptr_Input_v4int = OpTypePointer Input %v4int
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%i = OpVariable %_ptr_Input_v4int Input
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%uint = OpTypeInt 32 0
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%uint_0 = OpConstant %uint 0
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%_ptr_Input_int = OpTypePointer Input %int
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%int_10 = OpConstant %int 10
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%bool = OpTypeBool
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%int_1 = OpConstant %int 1
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%_ptr_Output_int = OpTypePointer Output %int
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%o = OpVariable %_ptr_Output_int Output
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%main = OpFunction %void None %8
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%24 = OpLabel
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; CHECK: [[load:%[a-zA-Z_\d]+]] = OpLoad %v4int %i
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%25 = OpLoad %v4int %i
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%41 = OpCompositeInsert %v4int %int_0 %25 0
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%27 = OpAccessChain %_ptr_Input_int %i %uint_0
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%28 = OpLoad %int %27
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%29 = OpSGreaterThan %bool %28 %int_10
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OpSelectionMerge %30 None
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OpBranchConditional %29 %31 %32
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%31 = OpLabel
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%43 = OpCopyObject %v4int %25
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OpBranch %30
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%32 = OpLabel
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%45 = OpCopyObject %v4int %25
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OpBranch %30
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%30 = OpLabel
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%50 = OpPhi %v4int %43 %31 %45 %32
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; CHECK: [[extract1:%[a-zA-Z_\d]+]] = OpCompositeExtract %int [[load]] 0
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%47 = OpCompositeExtract %int %50 0
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; CHECK: [[extract2:%[a-zA-Z_\d]+]] = OpCompositeExtract %int [[load]] 1
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%49 = OpCompositeExtract %int %41 1
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; CHECK: [[add:%[a-zA-Z_\d]+]] = OpIAdd %int [[extract1]] [[extract2]]
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%39 = OpIAdd %int %47 %49
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OpStore %o %39
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndMatch<SimplificationPass>(text, false);
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}
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TEST_F(SimplificationTest, ThroughLoops) {
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// Testing that folding rules are applied multiple times to instructions
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// to be able to propagate across loop iterations.
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const std::string text = R"(
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OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %main "main" %o %i
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OpExecutionMode %main OriginUpperLeft
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OpSource GLSL 430
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OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
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OpSourceExtension "GL_GOOGLE_include_directive"
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OpName %main "main"
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OpName %o "o"
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OpName %i "i"
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OpDecorate %o Location 0
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OpDecorate %i Flat
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OpDecorate %i Location 0
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%void = OpTypeVoid
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%8 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%v4int = OpTypeVector %int 4
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%int_0 = OpConstant %int 0
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; CHECK: [[constant:%[a-zA-Z_\d]+]] = OpConstantComposite %v4int %int_0 %int_0 %int_0 %int_0
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%13 = OpConstantComposite %v4int %int_0 %int_0 %int_0 %int_0
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%bool = OpTypeBool
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%_ptr_Output_int = OpTypePointer Output %int
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%o = OpVariable %_ptr_Output_int Output
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%_ptr_Input_v4int = OpTypePointer Input %v4int
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%i = OpVariable %_ptr_Input_v4int Input
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%68 = OpUndef %v4int
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%main = OpFunction %void None %8
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%23 = OpLabel
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; CHECK: [[load:%[a-zA-Z_\d]+]] = OpLoad %v4int %i
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%load = OpLoad %v4int %i
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OpBranch %24
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%24 = OpLabel
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%67 = OpPhi %v4int %load %23 %64 %26
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; CHECK: OpLoopMerge [[merge_lab:%[a-zA-Z_\d]+]]
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OpLoopMerge %25 %26 None
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OpBranch %27
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%27 = OpLabel
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%48 = OpCompositeExtract %int %67 0
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%30 = OpIEqual %bool %48 %int_0
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OpBranchConditional %30 %31 %25
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%31 = OpLabel
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%50 = OpCompositeExtract %int %67 0
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%54 = OpCompositeExtract %int %67 1
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%58 = OpCompositeExtract %int %67 2
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%62 = OpCompositeExtract %int %67 3
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%64 = OpCompositeConstruct %v4int %50 %54 %58 %62
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OpBranch %26
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%26 = OpLabel
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OpBranch %24
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%25 = OpLabel
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; CHECK: [[merge_lab]] = OpLabel
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; CHECK: [[extract:%[a-zA-Z_\d]+]] = OpCompositeExtract %int [[load]] 0
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%66 = OpCompositeExtract %int %67 0
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; CHECK-NEXT: OpStore %o [[extract]]
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OpStore %o %66
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndMatch<SimplificationPass>(text, false);
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}
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TEST_F(SimplificationTest, CopyObjectWithDecorations1) {
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// Don't simplify OpCopyObject if the result id has a decoration that the
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// operand does not.
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const std::string text = R"(OpCapability Shader
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OpCapability ShaderNonUniform
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %2 "main"
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OpExecutionMode %2 OriginUpperLeft
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OpSource GLSL 430
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OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
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OpSourceExtension "GL_GOOGLE_include_directive"
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OpDecorate %3 NonUniform
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%void = OpTypeVoid
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%5 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%2 = OpFunction %void None %5
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%7 = OpLabel
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%8 = OpUndef %int
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%3 = OpCopyObject %int %8
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%9 = OpIAdd %int %3 %3
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndCheck<SimplificationPass>(text, text, false);
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}
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TEST_F(SimplificationTest, CopyObjectWithDecorations2) {
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// Simplify OpCopyObject if the result id is a subset of the decorations of
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// the operand.
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const std::string before = R"(OpCapability Shader
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OpCapability ShaderNonUniform
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %2 "main"
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OpExecutionMode %2 OriginUpperLeft
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OpSource GLSL 430
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OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
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OpSourceExtension "GL_GOOGLE_include_directive"
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OpDecorate %3 NonUniform
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%void = OpTypeVoid
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%5 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%2 = OpFunction %void None %5
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%7 = OpLabel
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%3 = OpUndef %int
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%8 = OpCopyObject %int %3
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%9 = OpIAdd %int %8 %8
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OpReturn
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OpFunctionEnd
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)";
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const std::string after = R"(OpCapability Shader
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OpCapability ShaderNonUniform
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %2 "main"
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OpExecutionMode %2 OriginUpperLeft
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OpSource GLSL 430
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OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
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OpSourceExtension "GL_GOOGLE_include_directive"
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OpDecorate %3 NonUniform
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%void = OpTypeVoid
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%5 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%2 = OpFunction %void None %5
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%7 = OpLabel
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%3 = OpUndef %int
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%9 = OpIAdd %int %3 %3
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndCheck<SimplificationPass>(before, after, false);
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}
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TEST_F(SimplificationTest, DontMoveDecorations) {
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const std::string spirv = R"(
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; CHECK-NOT: RelaxedPrecision
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; CHECK: [[sub:%\w+]] = OpFSub
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; CHECK: OpStore {{.*}} [[sub]]
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OpCapability Shader
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OpMemoryModel Logical GLSL450
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OpEntryPoint GLCompute %main "main"
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OpExecutionMode %main LocalSize 1 1 1
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OpDecorate %add RelaxedPrecision
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OpDecorate %block Block
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OpMemberDecorate %block 0 Offset 0
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OpMemberDecorate %block 1 Offset 4
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OpDecorate %in DescriptorSet 0
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OpDecorate %in Binding 0
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OpDecorate %out DescriptorSet 0
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OpDecorate %out Binding 1
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%void = OpTypeVoid
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%float = OpTypeFloat 32
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%void_fn = OpTypeFunction %void
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%block = OpTypeStruct %float %float
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%ptr_ssbo_block = OpTypePointer StorageBuffer %block
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%in = OpVariable %ptr_ssbo_block StorageBuffer
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%out = OpVariable %ptr_ssbo_block StorageBuffer
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%ptr_ssbo_float = OpTypePointer StorageBuffer %float
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%int = OpTypeInt 32 0
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%int_0 = OpConstant %int 0
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%int_1 = OpConstant %int 1
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%float_0 = OpConstant %float 0
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%main = OpFunction %void None %void_fn
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%entry = OpLabel
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%in_gep_0 = OpAccessChain %ptr_ssbo_float %in %int_0
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%in_gep_1 = OpAccessChain %ptr_ssbo_float %in %int_1
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%load_0 = OpLoad %float %in_gep_0
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%load_1 = OpLoad %float %in_gep_1
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%sub = OpFSub %float %load_0 %load_1
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%add = OpFAdd %float %float_0 %sub
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%out_gep_0 = OpAccessChain %ptr_ssbo_float %out %int_0
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OpStore %out_gep_0 %add
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OpReturn
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OpFunctionEnd
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)";
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SinglePassRunAndMatch<SimplificationPass>(spirv, true);
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}
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} // namespace
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} // namespace opt
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} // namespace spvtools
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