From 2d48a7b4d0666ad16d03a22d85712617a0849046 Mon Sep 17 00:00:00 2001 From: ReinUsesLisp Date: Sat, 9 Jan 2021 03:30:07 -0300 Subject: shader: Initial recompiler work --- .../ir_opt/dead_code_elimination_pass.cpp | 23 ++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp (limited to 'src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp') 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..bbaa412f6 --- /dev/null +++ b/src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp @@ -0,0 +1,23 @@ +// Copyright 2021 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include + +#include "shader_recompiler/frontend/ir/basic_block.h" +#include "shader_recompiler/frontend/ir/microinstruction.h" +#include "shader_recompiler/ir_opt/passes.h" + +namespace Shader::Optimization { + +void DeadCodeEliminationPass(IR::Block& block) { + // We iterate over the instructions in reverse order. + // This is because removing an instruction reduces the number of uses for earlier instructions. + for (IR::Inst& inst : std::views::reverse(block)) { + if (!inst.HasUses() && !inst.MayHaveSideEffects()) { + inst.Invalidate(); + } + } +} + +} // namespace Shader::Optimization -- cgit v1.2.3