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author | bunnei <bunneidev@gmail.com> | 2021-07-25 20:39:04 +0200 |
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committer | GitHub <noreply@github.com> | 2021-07-25 20:39:04 +0200 |
commit | 98b26b6e126d4775fdf3f773fe8a8ac808a8ff8f (patch) | |
tree | 816faa96c2c4d291825063433331a8ea4b3d08f1 /src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp | |
parent | Merge pull request #6699 from lat9nq/common-threads (diff) | |
parent | shader: Support out of bound local memory reads and immediate writes (diff) | |
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Diffstat (limited to 'src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp')
-rw-r--r-- | src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp b/src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp new file mode 100644 index 000000000..400836301 --- /dev/null +++ b/src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp @@ -0,0 +1,26 @@ +// Copyright 2021 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#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 DeadCodeEliminationPass(IR::Program& program) { + // We iterate over the instructions in reverse order. + // This is because removing an instruction reduces the number of uses for earlier instructions. + for (IR::Block* const block : program.post_order_blocks) { + auto it{block->end()}; + while (it != block->begin()) { + --it; + if (!it->HasUses() && !it->MayHaveSideEffects()) { + it->Invalidate(); + it = block->Instructions().erase(it); + } + } + } +} + +} // namespace Shader::Optimization |