SPIRV-Tools/test/opt/loop_optimizations/unswitch.cpp

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// Copyright (c) 2018 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 <string>
#include "effcee/effcee.h"
#include "gmock/gmock.h"
#include "test/opt/pass_fixture.h"
namespace spvtools {
namespace opt {
namespace {
using UnswitchTest = PassTest<::testing::Test>;
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 450 core
uniform vec4 c;
void main() {
int i = 0;
int j = 0;
bool cond = c[0] == 0;
for (; i < 10; i++, j++) {
if (cond) {
i++;
}
else {
j++;
}
}
}
*/
TEST_F(UnswitchTest, SimpleUnswitch) {
const std::string text = R"(
; CHECK: [[cst_cond:%\w+]] = OpFOrdEqual
; CHECK-NEXT: OpSelectionMerge [[if_merge:%\w+]] None
; CHECK-NEXT: OpBranchConditional [[cst_cond]] [[loop_t:%\w+]] [[loop_f:%\w+]]
; Loop specialized for false.
; CHECK: [[loop_f]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_f]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: [[phi_j:%\w+]] = OpPhi %int %int_0 [[loop_f]] [[iv_j:%\w+]] [[continue]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; [[loop_body]] = OpLabel
; CHECK: OpSelectionMerge [[sel_merge:%\w+]] None
; CHECK: OpBranchConditional %false [[bb1:%\w+]] [[bb2:%\w+]]
; CHECK: [[bb2]] = OpLabel
; CHECK-NEXT: [[inc_j:%\w+]] = OpIAdd %int [[phi_j]] %int_1
; CHECK-NEXT: OpBranch [[sel_merge]]
; CHECK: [[bb1]] = OpLabel
; CHECK-NEXT: [[inc_i:%\w+]] = OpIAdd %int [[phi_i]] %int_1
; CHECK-NEXT: OpBranch [[sel_merge]]
; CHECK: [[sel_merge]] = OpLabel
; CHECK: OpBranch [[if_merge]]
; Loop specialized for true.
; CHECK: [[loop_t]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_t]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: [[phi_j:%\w+]] = OpPhi %int %int_0 [[loop_t]] [[iv_j:%\w+]] [[continue]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; [[loop_body]] = OpLabel
; CHECK: OpSelectionMerge [[sel_merge:%\w+]] None
; CHECK: OpBranchConditional %true [[bb1:%\w+]] [[bb2:%\w+]]
; CHECK: [[bb1]] = OpLabel
; CHECK-NEXT: [[inc_i:%\w+]] = OpIAdd %int [[phi_i]] %int_1
; CHECK-NEXT: OpBranch [[sel_merge]]
; CHECK: [[bb2]] = OpLabel
; CHECK-NEXT: [[inc_j:%\w+]] = OpIAdd %int [[phi_j]] %int_1
; CHECK-NEXT: OpBranch [[sel_merge]]
; CHECK: [[sel_merge]] = OpLabel
; CHECK: OpBranch [[if_merge]]
; CHECK: [[if_merge]] = OpLabel
; CHECK-NEXT: OpReturn
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main"
OpExecutionMode %main OriginLowerLeft
OpSource GLSL 450
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
OpDecorate %c DescriptorSet 0
%void = OpTypeVoid
%3 = OpTypeFunction %void
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%bool = OpTypeBool
%_ptr_Function_bool = OpTypePointer Function %bool
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_UniformConstant_v4float = OpTypePointer UniformConstant %v4float
%c = OpVariable %_ptr_UniformConstant_v4float UniformConstant
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_UniformConstant_float = OpTypePointer UniformConstant %float
%float_0 = OpConstant %float 0
%int_10 = OpConstant %int 10
%int_1 = OpConstant %int 1
%main = OpFunction %void None %3
%5 = OpLabel
%21 = OpAccessChain %_ptr_UniformConstant_float %c %uint_0
%22 = OpLoad %float %21
%24 = OpFOrdEqual %bool %22 %float_0
OpBranch %25
%25 = OpLabel
%46 = OpPhi %int %int_0 %5 %43 %28
%47 = OpPhi %int %int_0 %5 %45 %28
OpLoopMerge %27 %28 None
OpBranch %29
%29 = OpLabel
%32 = OpSLessThan %bool %46 %int_10
OpBranchConditional %32 %26 %27
%26 = OpLabel
OpSelectionMerge %35 None
OpBranchConditional %24 %34 %39
%34 = OpLabel
%38 = OpIAdd %int %46 %int_1
OpBranch %35
%39 = OpLabel
%41 = OpIAdd %int %47 %int_1
OpBranch %35
%35 = OpLabel
%48 = OpPhi %int %38 %34 %46 %39
%49 = OpPhi %int %47 %34 %41 %39
OpBranch %28
%28 = OpLabel
%43 = OpIAdd %int %48 %int_1
%45 = OpIAdd %int %49 %int_1
OpBranch %25
%27 = OpLabel
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LoopUnswitchPass>(text, true);
}
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 330 core
in vec4 c;
void main() {
int i = 0;
bool cond = c[0] == 0;
for (; i < 10; i++) {
if (cond) {
i++;
}
else {
return;
}
}
}
*/
TEST_F(UnswitchTest, UnswitchExit) {
const std::string text = R"(
; CHECK: [[cst_cond:%\w+]] = OpFOrdEqual
; CHECK-NEXT: OpSelectionMerge [[if_merge:%\w+]] None
; CHECK-NEXT: OpBranchConditional [[cst_cond]] [[loop_t:%\w+]] [[loop_f:%\w+]]
; Loop specialized for false.
; CHECK: [[loop_f]] = OpLabel
; CHECK: OpReturn
; Loop specialized for true.
; CHECK: [[loop_t]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_t]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] {{%\w+}} [[merge]]
; Check that we have i+=2.
; CHECK: [[phi_i:%\w+]] = OpIAdd %int [[phi_i]] %int_1
; CHECK: [[iv_i]] = OpIAdd %int [[phi_i]] %int_1
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; CHECK: [[if_merge]] = OpLabel
; CHECK-NEXT: OpReturn
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %c
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 330
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
OpDecorate %23 Uniform
%void = OpTypeVoid
%3 = OpTypeFunction %void
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%bool = OpTypeBool
%_ptr_Function_bool = OpTypePointer Function %bool
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%c = OpVariable %_ptr_Input_v4float Input
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
%float_0 = OpConstant %float 0
%int_10 = OpConstant %int 10
%int_1 = OpConstant %int 1
%main = OpFunction %void None %3
%5 = OpLabel
%20 = OpAccessChain %_ptr_Input_float %c %uint_0
%21 = OpLoad %float %20
%23 = OpFOrdEqual %bool %21 %float_0
OpBranch %24
%24 = OpLabel
%42 = OpPhi %int %int_0 %5 %41 %27
OpLoopMerge %26 %27 None
OpBranch %28
%28 = OpLabel
%31 = OpSLessThan %bool %42 %int_10
OpBranchConditional %31 %25 %26
%25 = OpLabel
OpSelectionMerge %34 None
OpBranchConditional %23 %33 %38
%33 = OpLabel
%37 = OpIAdd %int %42 %int_1
OpBranch %34
%38 = OpLabel
OpReturn
%34 = OpLabel
OpBranch %27
%27 = OpLabel
%41 = OpIAdd %int %37 %int_1
OpBranch %24
%26 = OpLabel
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LoopUnswitchPass>(text, true);
}
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 330 core
in vec4 c;
void main() {
int i = 0;
bool cond = c[0] == 0;
for (; i < 10; i++) {
if (cond) {
continue;
}
else {
i++;
}
}
}
*/
TEST_F(UnswitchTest, UnswitchContinue) {
const std::string text = R"(
; CHECK: [[cst_cond:%\w+]] = OpFOrdEqual
; CHECK-NEXT: OpSelectionMerge [[if_merge:%\w+]] None
; CHECK-NEXT: OpBranchConditional [[cst_cond]] [[loop_t:%\w+]] [[loop_f:%\w+]]
; Loop specialized for false.
; CHECK: [[loop_f]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_f]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; CHECK: [[loop_body:%\w+]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpBranchConditional %false
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; Loop specialized for true.
; CHECK: [[loop_t]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_t]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; CHECK: [[loop_body:%\w+]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpBranchConditional %true
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; CHECK: [[if_merge]] = OpLabel
; CHECK-NEXT: OpReturn
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %c
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 330
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
OpDecorate %23 Uniform
%void = OpTypeVoid
%3 = OpTypeFunction %void
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%bool = OpTypeBool
%_ptr_Function_bool = OpTypePointer Function %bool
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%c = OpVariable %_ptr_Input_v4float Input
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
%float_0 = OpConstant %float 0
%int_10 = OpConstant %int 10
%int_1 = OpConstant %int 1
%main = OpFunction %void None %3
%5 = OpLabel
%20 = OpAccessChain %_ptr_Input_float %c %uint_0
%21 = OpLoad %float %20
%23 = OpFOrdEqual %bool %21 %float_0
OpBranch %24
%24 = OpLabel
%42 = OpPhi %int %int_0 %5 %41 %27
OpLoopMerge %26 %27 None
OpBranch %28
%28 = OpLabel
%31 = OpSLessThan %bool %42 %int_10
OpBranchConditional %31 %25 %26
%25 = OpLabel
OpSelectionMerge %34 None
OpBranchConditional %23 %33 %36
%33 = OpLabel
OpBranch %27
%36 = OpLabel
%39 = OpIAdd %int %42 %int_1
OpBranch %34
%34 = OpLabel
OpBranch %27
%27 = OpLabel
%43 = OpPhi %int %42 %33 %39 %34
%41 = OpIAdd %int %43 %int_1
OpBranch %24
%26 = OpLabel
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LoopUnswitchPass>(text, true);
}
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 330 core
in vec4 c;
void main() {
int i = 0;
bool cond = c[0] == 0;
for (; i < 10; i++) {
if (cond) {
i++;
}
else {
break;
}
}
}
*/
TEST_F(UnswitchTest, UnswitchKillLoop) {
const std::string text = R"(
; CHECK: [[cst_cond:%\w+]] = OpFOrdEqual
; CHECK-NEXT: OpSelectionMerge [[if_merge:%\w+]] None
; CHECK-NEXT: OpBranchConditional [[cst_cond]] [[loop_t:%\w+]] [[loop_f:%\w+]]
; Loop specialized for false.
; CHECK: [[loop_f]] = OpLabel
; CHECK: OpBranch [[if_merge]]
; Loop specialized for true.
; CHECK: [[loop_t]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_t]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] {{%\w+}} [[merge]]
; Check that we have i+=2.
; CHECK: [[phi_i:%\w+]] = OpIAdd %int [[phi_i]] %int_1
; CHECK: [[iv_i]] = OpIAdd %int [[phi_i]] %int_1
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; CHECK: [[if_merge]] = OpLabel
; CHECK-NEXT: OpReturn
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %c
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 330
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
OpDecorate %23 Uniform
%void = OpTypeVoid
%3 = OpTypeFunction %void
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%bool = OpTypeBool
%_ptr_Function_bool = OpTypePointer Function %bool
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%c = OpVariable %_ptr_Input_v4float Input
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
%float_0 = OpConstant %float 0
%int_10 = OpConstant %int 10
%int_1 = OpConstant %int 1
%main = OpFunction %void None %3
%5 = OpLabel
%20 = OpAccessChain %_ptr_Input_float %c %uint_0
%21 = OpLoad %float %20
%23 = OpFOrdEqual %bool %21 %float_0
OpBranch %24
%24 = OpLabel
%42 = OpPhi %int %int_0 %5 %41 %27
OpLoopMerge %26 %27 None
OpBranch %28
%28 = OpLabel
%31 = OpSLessThan %bool %42 %int_10
OpBranchConditional %31 %25 %26
%25 = OpLabel
OpSelectionMerge %34 None
OpBranchConditional %23 %33 %38
%33 = OpLabel
%37 = OpIAdd %int %42 %int_1
OpBranch %34
%38 = OpLabel
OpBranch %26
%34 = OpLabel
OpBranch %27
%27 = OpLabel
%41 = OpIAdd %int %37 %int_1
OpBranch %24
%26 = OpLabel
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LoopUnswitchPass>(text, true);
}
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 330 core
in vec4 c;
void main() {
int i = 0;
int cond = int(c[0]);
for (; i < 10; i++) {
switch (cond) {
case 0:
return;
case 1:
discard;
case 2:
break;
default:
break;
}
}
bool cond2 = i == 9;
}
*/
TEST_F(UnswitchTest, UnswitchSwitch) {
const std::string text = R"(
; CHECK: [[cst_cond:%\w+]] = OpConvertFToS
; CHECK-NEXT: OpSelectionMerge [[if_merge:%\w+]] None
; CHECK-NEXT: OpSwitch [[cst_cond]] [[default:%\w+]] 0 [[loop_0:%\w+]] 1 [[loop_1:%\w+]] 2 [[loop_2:%\w+]]
; Loop specialized for 2.
; CHECK: [[loop_2]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_2]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; CHECK: [[loop_body]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpSwitch %int_2
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; Loop specialized for 1.
; CHECK: [[loop_1]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_1]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; CHECK: [[loop_body]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpSwitch %int_1
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; Loop specialized for 0.
; CHECK: [[loop_0]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[loop_0]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; CHECK: [[loop_body]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpSwitch %int_0
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; Loop specialized for the default case.
; CHECK: [[default]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: [[phi_i:%\w+]] = OpPhi %int %int_0 [[default]] [[iv_i:%\w+]] [[continue:%\w+]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK: [[loop_exit:%\w+]] = OpSLessThan {{%\w+}} [[phi_i]] {{%\w+}}
; CHECK-NEXT: OpBranchConditional [[loop_exit]] [[loop_body:%\w+]] [[merge]]
; CHECK: [[loop_body]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpSwitch %uint_3
; CHECK: [[merge]] = OpLabel
; CHECK-NEXT: OpBranch [[if_merge]]
; CHECK: [[if_merge]] = OpLabel
; CHECK-NEXT: OpReturn
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %c
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 330
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
OpDecorate %20 Uniform
%void = OpTypeVoid
%3 = OpTypeFunction %void
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%c = OpVariable %_ptr_Input_v4float Input
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
%int_10 = OpConstant %int 10
%bool = OpTypeBool
%int_1 = OpConstant %int 1
%_ptr_Function_bool = OpTypePointer Function %bool
%main = OpFunction %void None %3
%5 = OpLabel
%18 = OpAccessChain %_ptr_Input_float %c %uint_0
%19 = OpLoad %float %18
%20 = OpConvertFToS %int %19
OpBranch %21
%21 = OpLabel
%49 = OpPhi %int %int_0 %5 %43 %24
OpLoopMerge %23 %24 None
OpBranch %25
%25 = OpLabel
%29 = OpSLessThan %bool %49 %int_10
OpBranchConditional %29 %22 %23
%22 = OpLabel
OpSelectionMerge %35 None
OpSwitch %20 %34 0 %31 1 %32 2 %33
%34 = OpLabel
OpBranch %35
%31 = OpLabel
OpReturn
%32 = OpLabel
OpKill
%33 = OpLabel
OpBranch %35
%35 = OpLabel
OpBranch %24
%24 = OpLabel
%43 = OpIAdd %int %49 %int_1
OpBranch %21
%23 = OpLabel
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LoopUnswitchPass>(text, true);
}
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 440 core
layout(location = 0)in vec4 c;
void main() {
int i = 0;
int j = 0;
int k = 0;
bool cond = c[0] == 0;
for (; i < 10; i++) {
for (; j < 10; j++) {
if (cond) {
i++;
} else {
j++;
}
}
}
}
*/
TEST_F(UnswitchTest, UnSwitchNested) {
// Test that an branch can be unswitched out of two nested loops.
const std::string text = R"(
; CHECK: [[cst_cond:%\w+]] = OpFOrdEqual
; CHECK-NEXT: OpSelectionMerge [[if_merge:%\w+]] None
; CHECK-NEXT: OpBranchConditional [[cst_cond]] [[loop_t:%\w+]] [[loop_f:%\w+]]
; Loop specialized for false
; CHECK: [[loop_f]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: {{%\w+}} = OpPhi %int %int_0 [[loop_f]] {{%\w+}} [[continue:%\w+]]
; CHECK-NEXT: {{%\w+}} = OpPhi %int %int_0 [[loop_f]] {{%\w+}} [[continue]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK-NOT: [[merge]] = OpLabel
; CHECK: OpLoopMerge
; CHECK-NEXT: OpBranch [[bb1:%\w+]]
; CHECK: [[bb1]] = OpLabel
; CHECK-NEXT: OpSLessThan
; CHECK-NEXT: OpBranchConditional {{%\w+}} [[bb2:%\w+]]
; CHECK: [[bb2]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpBranchConditional %false
; CHECK: [[merge]] = OpLabel
; Loop specialized for true. Same as first loop except the branch condition is true.
; CHECK: [[loop_t]] = OpLabel
; CHECK-NEXT: OpBranch [[loop:%\w+]]
; CHECK: [[loop]] = OpLabel
; CHECK-NEXT: {{%\w+}} = OpPhi %int %int_0 [[loop_t]] {{%\w+}} [[continue:%\w+]]
; CHECK-NEXT: {{%\w+}} = OpPhi %int %int_0 [[loop_t]] {{%\w+}} [[continue]]
; CHECK-NEXT: OpLoopMerge [[merge:%\w+]] [[continue]] None
; CHECK-NOT: [[merge]] = OpLabel
; CHECK: OpLoopMerge
; CHECK-NEXT: OpBranch [[bb1:%\w+]]
; CHECK: [[bb1]] = OpLabel
; CHECK-NEXT: OpSLessThan
; CHECK-NEXT: OpBranchConditional {{%\w+}} [[bb2:%\w+]]
; CHECK: [[bb2]] = OpLabel
; CHECK-NEXT: OpSelectionMerge
; CHECK-NEXT: OpBranchConditional %true
; CHECK: [[merge]] = OpLabel
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %c
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 440
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
OpDecorate %25 Uniform
%void = OpTypeVoid
%3 = OpTypeFunction %void
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%bool = OpTypeBool
%_ptr_Function_bool = OpTypePointer Function %bool
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%c = OpVariable %_ptr_Input_v4float Input
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
%float_0 = OpConstant %float 0
%int_10 = OpConstant %int 10
%int_1 = OpConstant %int 1
%main = OpFunction %void None %3
%5 = OpLabel
%22 = OpAccessChain %_ptr_Input_float %c %uint_0
%23 = OpLoad %float %22
%25 = OpFOrdEqual %bool %23 %float_0
OpBranch %26
%26 = OpLabel
%67 = OpPhi %int %int_0 %5 %52 %29
%68 = OpPhi %int %int_0 %5 %70 %29
OpLoopMerge %28 %29 None
OpBranch %30
%30 = OpLabel
%33 = OpSLessThan %bool %67 %int_10
OpBranchConditional %33 %27 %28
%27 = OpLabel
OpBranch %34
%34 = OpLabel
%69 = OpPhi %int %67 %27 %46 %37
%70 = OpPhi %int %68 %27 %50 %37
OpLoopMerge %36 %37 None
OpBranch %38
%38 = OpLabel
%40 = OpSLessThan %bool %70 %int_10
OpBranchConditional %40 %35 %36
%35 = OpLabel
OpSelectionMerge %43 None
OpBranchConditional %25 %42 %47
%42 = OpLabel
%46 = OpIAdd %int %69 %int_1
OpBranch %43
%47 = OpLabel
OpReturn
%43 = OpLabel
OpBranch %37
%37 = OpLabel
%50 = OpIAdd %int %70 %int_1
OpBranch %34
%36 = OpLabel
OpBranch %29
%29 = OpLabel
%52 = OpIAdd %int %69 %int_1
OpBranch %26
%28 = OpLabel
OpReturn
OpFunctionEnd
)";
SinglePassRunAndMatch<LoopUnswitchPass>(text, true);
}
/*
Generated from the following GLSL + --eliminate-local-multi-store
#version 330 core
in vec4 c;
void main() {
bool cond = false;
if (c[0] == 0) {
cond = c[1] == 0;
} else {
cond = c[2] == 0;
}
for (int i = 0; i < 10; i++) {
if (cond) {
i++;
}
}
}
*/
TEST_F(UnswitchTest, UnswitchNotUniform) {
// Check that the unswitch is not triggered (condition loop invariant but not
// uniform)
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %c
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 330
OpName %main "main"
OpName %c "c"
OpDecorate %c Location 0
%void = OpTypeVoid
%3 = OpTypeFunction %void
%bool = OpTypeBool
%_ptr_Function_bool = OpTypePointer Function %bool
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%c = OpVariable %_ptr_Input_v4float Input
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
%float_0 = OpConstant %float 0
%uint_1 = OpConstant %uint 1
%uint_2 = OpConstant %uint 2
%int = OpTypeInt 32 1
%_ptr_Function_int = OpTypePointer Function %int
%int_0 = OpConstant %int 0
%int_10 = OpConstant %int 10
%int_1 = OpConstant %int 1
%main = OpFunction %void None %3
%5 = OpLabel
%17 = OpAccessChain %_ptr_Input_float %c %uint_0
%18 = OpLoad %float %17
%20 = OpFOrdEqual %bool %18 %float_0
OpSelectionMerge %22 None
OpBranchConditional %20 %21 %27
%21 = OpLabel
%24 = OpAccessChain %_ptr_Input_float %c %uint_1
%25 = OpLoad %float %24
%26 = OpFOrdEqual %bool %25 %float_0
OpBranch %22
%27 = OpLabel
%29 = OpAccessChain %_ptr_Input_float %c %uint_2
%30 = OpLoad %float %29
%31 = OpFOrdEqual %bool %30 %float_0
OpBranch %22
%22 = OpLabel
%52 = OpPhi %bool %26 %21 %31 %27
OpBranch %36
%36 = OpLabel
%53 = OpPhi %int %int_0 %22 %51 %39
OpLoopMerge %38 %39 None
OpBranch %40
%40 = OpLabel
%43 = OpSLessThan %bool %53 %int_10
OpBranchConditional %43 %37 %38
%37 = OpLabel
OpSelectionMerge %46 None
OpBranchConditional %52 %45 %46
%45 = OpLabel
%49 = OpIAdd %int %53 %int_1
OpBranch %46
%46 = OpLabel
%54 = OpPhi %int %53 %37 %49 %45
OpBranch %39
%39 = OpLabel
%51 = OpIAdd %int %54 %int_1
OpBranch %36
%38 = OpLabel
OpReturn
OpFunctionEnd
)";
auto result =
SinglePassRunAndDisassemble<LoopUnswitchPass>(text, true, false);
EXPECT_EQ(Pass::Status::SuccessWithoutChange, std::get<1>(result));
}
TEST_F(UnswitchTest, DontUnswitchLatch) {
// Check that the unswitch is not triggered for the latch branch.
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %4 "main"
OpExecutionMode %4 OriginUpperLeft
OpSource ESSL 310
%void = OpTypeVoid
%3 = OpTypeFunction %void
%bool = OpTypeBool
%false = OpConstantFalse %bool
%4 = OpFunction %void None %3
%5 = OpLabel
OpBranch %6
%6 = OpLabel
OpLoopMerge %8 %9 None
OpBranch %7
%7 = OpLabel
OpBranch %9
%9 = OpLabel
OpBranchConditional %false %6 %8
%8 = OpLabel
OpReturn
OpFunctionEnd
)";
auto result =
SinglePassRunAndDisassemble<LoopUnswitchPass>(text, true, false);
EXPECT_EQ(Pass::Status::SuccessWithoutChange, std::get<1>(result));
}
TEST_F(UnswitchTest, DontUnswitchConstantCondition) {
const std::string text = R"(
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main"
OpExecutionMode %main OriginLowerLeft
OpSource GLSL 450
OpName %main "main"
%void = OpTypeVoid
%4 = OpTypeFunction %void
%int = OpTypeInt 32 1
%int_0 = OpConstant %int 0
%bool = OpTypeBool
%true = OpConstantTrue %bool
%int_1 = OpConstant %int 1
%main = OpFunction %void None %4
%10 = OpLabel
OpBranch %11
%11 = OpLabel
%12 = OpPhi %int %int_0 %10 %13 %14
OpLoopMerge %15 %14 None
OpBranch %16
%16 = OpLabel
%17 = OpSLessThan %bool %12 %int_1
OpBranchConditional %17 %18 %15
%18 = OpLabel
OpSelectionMerge %19 None
OpBranchConditional %true %20 %19
%20 = OpLabel
%21 = OpIAdd %int %12 %int_1
OpBranch %19
%19 = OpLabel
%22 = OpPhi %int %21 %20 %12 %18
OpBranch %14
%14 = OpLabel
%13 = OpIAdd %int %22 %int_1
OpBranch %11
%15 = OpLabel
OpReturn
OpFunctionEnd
)";
auto result =
SinglePassRunAndDisassemble<LoopUnswitchPass>(text, true, false);
EXPECT_EQ(Pass::Status::SuccessWithoutChange, std::get<1>(result));
}
} // namespace
} // namespace opt
} // namespace spvtools