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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <vector>
#include <boost/container/small_vector.hpp>
#include "shader_recompiler/frontend/ir/basic_block.h"
#include "shader_recompiler/frontend/ir/value.h"
#include "shader_recompiler/ir_opt/passes.h"
namespace Shader::Optimization {
void IdentityRemovalPass(IR::Program& program) {
boost::container::small_vector<IR::Inst*, 16> to_invalidate;
for (IR::Block* const block : program.blocks) {
for (auto it = block->begin(); it != block->end();) {
const size_t num_args{it->NumArgs()};
for (size_t i = 0; i < num_args; ++i) {
IR::Value arg = it->Arg(i);
if (arg.IsIdentity()) {
do { // Pointer chasing (3-derefs)
arg = arg.Inst()->Arg(0);
} while (arg.IsIdentity());
it->SetArg(i, arg);
}
}
if (it->GetOpcode() == IR::Opcode::Identity || it->GetOpcode() == IR::Opcode::Void) {
to_invalidate.push_back(&*it);
it = block->Instructions().erase(it);
} else {
++it;
}
}
}
for (IR::Inst* const inst : to_invalidate)
inst->Invalidate();
}
} // namespace Shader::Optimization
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