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[spirv-opt] Handle OpFunction in GetPtr (#5316)

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When using PhysicalStorageBuffer it is possible for a function to
return a pointer type. This was not being handled correctly in
`GetLoadedVariablesFromFunctionCall` in the DCE pass because
`IsPtr` returns the wrong result.

Fixes #5270.
This commit is contained in:
ncesario-lunarg 2023-07-17 13:16:25 -06:00 committed by GitHub
parent 6add9ccf07
commit 7dd5f95d25
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3 changed files with 73 additions and 0 deletions
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3
source/opt/aggressive_dead_code_elim_pass.cpp
View File

@ -438,6 +438,9 @@ std::vector<uint32_t> AggressiveDCEPass::GetLoadedVariablesFromFunctionCall(
const Instruction* inst) {
assert(inst->opcode() == spv::Op::OpFunctionCall);
std::vector<uint32_t> live_variables;
// NOTE: we should only be checking function call parameters here, not the
// function itself, however, `IsPtr` will trivially return false for
// OpFunction
inst->ForEachInId([this, &live_variables](const uint32_t* operand_id) {
if (!IsPtr(*operand_id)) return;
uint32_t var_id = GetVariableId(*operand_id);

5
source/opt/mem_pass.cpp
View File

@ -76,6 +76,11 @@ bool MemPass::IsNonPtrAccessChain(const spv::Op opcode) const {
bool MemPass::IsPtr(uint32_t ptrId) {
uint32_t varId = ptrId;
Instruction* ptrInst = get_def_use_mgr()->GetDef(varId);
if (ptrInst->opcode() == spv::Op::OpFunction) {
// A function is not a pointer, but it's return type could be, which will
// erroneously lead to this function returning true later on
return false;
}
while (ptrInst->opcode() == spv::Op::OpCopyObject) {
varId = ptrInst->GetSingleWordInOperand(kCopyObjectOperandInIdx);
ptrInst = get_def_use_mgr()->GetDef(varId);

65
test/opt/aggressive_dead_code_elim_test.cpp
View File

@ -7884,6 +7884,71 @@ TEST_F(AggressiveDCETest, RemoveWhenUsingPrintfExtension) {
SinglePassRunAndMatch<AggressiveDCEPass>(text, true);
}
TEST_F(AggressiveDCETest, FunctionReturnPointer) {
// Run DCE when a function returning a pointer to a reference is present
const std::string text = R"(
OpCapability Shader
OpCapability PhysicalStorageBufferAddresses
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel PhysicalStorageBuffer64 GLSL450
OpEntryPoint Vertex %2 "main" %3 %4
OpSource GLSL 450
OpSourceExtension "GL_EXT_buffer_reference"
OpSourceExtension "GL_EXT_scalar_block_layout"
OpName %4 "color"
OpMemberDecorate %5 0 Offset 0
OpDecorate %5 Block
OpMemberDecorate %7 0 Offset 0
OpDecorate %7 Block
OpDecorate %8 AliasedPointer
OpDecorate %4 Location 0
%9 = OpTypeVoid
%10 = OpTypeFunction %9
OpTypeForwardPointer %11 PhysicalStorageBuffer
%12 = OpTypeInt 32 0
%5 = OpTypeStruct %12
%11 = OpTypePointer PhysicalStorageBuffer %5
;CHECK: [[pt:%\w+]] = OpTypePointer PhysicalStorageBuffer {{%\w+}}
%13 = OpTypeFunction %11
;CHECK: [[pt_fn:%\w+]] = OpTypeFunction [[pt]]
%7 = OpTypeStruct %11
%14 = OpTypePointer PushConstant %7
%3 = OpVariable %14 PushConstant
%15 = OpTypeInt 32 1
%16 = OpConstant %15 0
%17 = OpTypePointer PushConstant %11
%18 = OpTypePointer Function %11
%19 = OpTypeFloat 32
%20 = OpTypeVector %19 4
%21 = OpTypePointer Output %20
%4 = OpVariable %21 Output
%22 = OpConstant %19 1
%23 = OpConstant %19 0
%24 = OpConstantComposite %20 %22 %23 %22 %22
%6 = OpFunction %11 None %13
;CHECK: [[fn:%\w+]] = OpFunction [[pt]] None [[pt_fn]]
%27 = OpLabel
%28 = OpAccessChain %17 %3 %16
%29 = OpLoad %11 %28
OpReturnValue %29
OpFunctionEnd
%2 = OpFunction %9 None %10
%25 = OpLabel
%8 = OpVariable %18 Function
%26 = OpFunctionCall %11 %6
;CHECK: {{%\w+}} = OpFunctionCall [[pt]] [[fn]]
OpStore %8 %26
OpStore %4 %24
OpReturn
OpFunctionEnd
)";
// For physical storage buffer support
SetTargetEnv(SPV_ENV_VULKAN_1_2);
SinglePassRunAndMatch<AggressiveDCEPass>(text, true);
}
} // namespace
} // namespace opt
} // namespace spvtools