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constant_propagation_pass: Fold unpack ops with constants and reverse ops (#4240)

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Co-authored-by: georgemoralis <giorgosmrls@gmail.com>
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TheTurtle 2026-04-09 22:13:20 +03:00 committed by GitHub
parent daa7b5c04b
commit 927e044f92
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1 changed files with 20 additions and 0 deletions
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20
src/shader_recompiler/ir/passes/constant_propagation_pass.cpp
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@ -192,6 +192,22 @@ void FoldLogicalNot(IR::Inst& inst) {
}
}
void FoldUnpack32x2(IR::Block& block, IR::Inst& inst, IR::Opcode reverse) {
const IR::Value value{inst.Arg(0)};
if (value.IsImmediate()) {
IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
const auto value_lo = ir.Imm32(value.U32());
const auto value_hi = ir.Imm32(static_cast<u32>(value.U64() >> 32));
inst.ReplaceUsesWithAndRemove(ir.CompositeConstruct(value_lo, value_hi));
return;
}
IR::Inst* const arg_inst{value.InstRecursive()};
if (arg_inst->GetOpcode() == reverse) {
inst.ReplaceUsesWithAndRemove(arg_inst->Arg(0));
return;
}
}
void FoldInverseFunc(IR::Inst& inst, IR::Opcode reverse) {
const IR::Value value{inst.Arg(0)};
if (value.IsImmediate()) {
@ -342,6 +358,10 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
return FoldBitCast<IR::Opcode::BitCastF32U32, f32, u32>(inst, IR::Opcode::BitCastU32F32);
case IR::Opcode::BitCastU32F32:
return FoldBitCast<IR::Opcode::BitCastU32F32, u32, f32>(inst, IR::Opcode::BitCastF32U32);
case IR::Opcode::UnpackUint2x32:
return FoldUnpack32x2(block, inst, IR::Opcode::PackUint2x32);
case IR::Opcode::UnpackDouble2x32:
return FoldUnpack32x2(block, inst, IR::Opcode::PackDouble2x32);
// 2x16
case IR::Opcode::PackUnorm2x16:
return FoldInverseFunc(inst, IR::Opcode::UnpackUnorm2x16);