27 lines
895 B
C++
27 lines
895 B
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 "shader_recompiler/frontend/ir/basic_block.h"
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#include "shader_recompiler/frontend/ir/value.h"
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#include "shader_recompiler/ir_opt/passes.h"
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namespace Shader::Optimization {
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void DeadCodeEliminationPass(IR::Program& program) {
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// We iterate over the instructions in reverse order.
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// This is because removing an instruction reduces the number of uses for earlier instructions.
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for (IR::Block* const block : program.post_order_blocks) {
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auto it{block->end()};
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while (it != block->begin()) {
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--it;
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if (!it->HasUses() && !it->MayHaveSideEffects()) {
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it->Invalidate();
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it = block->Instructions().erase(it);
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}
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}
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}
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}
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} // namespace Shader::Optimization
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