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ir_passes: Fold readlane with ff1 pattern (#3224)

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This commit is contained in:
TheTurtle
2025-07-10 14:19:44 +03:00
committed by GitHub
parent ee97c5c110
commit 88abb93669
3 changed files with 17 additions and 4 deletions
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14
src/shader_recompiler/ir/passes/readlane_elimination_pass.cpp
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@@ -95,6 +95,20 @@ void ReadLaneEliminationPass(IR::Program& program) {
if (inst.GetOpcode() != IR::Opcode::ReadLane) {
continue;
}
// Check for the following pattern and replace it with ReadFirstLane
// s_ff1_i32_b64 sgpr, exec
// v_readlane_b32 sdst, vgpr, sgpr
if (const auto lane = inst.Arg(1); !lane.IsImmediate()) {
if (lane.InstRecursive()->GetOpcode() == IR::Opcode::FindILsb64) {
const auto value = inst.Arg(0);
inst.ReplaceOpcode(IR::Opcode::ReadFirstLane);
inst.ClearArgs();
inst.SetArg(0, value);
}
continue;
}
const u32 lane = inst.Arg(1).U32();
IR::Inst* prod = inst.Arg(0).InstRecursive();