38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
// Copyright 2021 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <vector>
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#include "shader_recompiler/frontend/ir/basic_block.h"
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#include "shader_recompiler/frontend/ir/microinstruction.h"
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#include "shader_recompiler/ir_opt/passes.h"
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namespace Shader::Optimization {
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void IdentityRemovalPass(IR::Block& block) {
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std::vector<IR::Inst*> to_invalidate;
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for (auto inst = block.begin(); inst != block.end();) {
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const size_t num_args{inst->NumArgs()};
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for (size_t i = 0; i < num_args; ++i) {
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IR::Value arg;
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while ((arg = inst->Arg(i)).IsIdentity()) {
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inst->SetArg(i, arg.Inst()->Arg(0));
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}
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}
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if (inst->Opcode() == IR::Opcode::Identity || inst->Opcode() == IR::Opcode::Void) {
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to_invalidate.push_back(&*inst);
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inst = block.Instructions().erase(inst);
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} else {
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++inst;
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}
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}
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for (IR::Inst* const inst : to_invalidate) {
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inst->Invalidate();
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}
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}
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} // namespace Shader::Optimization
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