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shader: fold exact float class masks into native NaN predicates

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This commit is contained in:
nmzik
2026-10-09 02:49:49 +02:00
parent 393257eaae
commit 7b9997baea
4 changed files with 63 additions and 5 deletions
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src/graphics/shader/recompiler/ir/passes/ConstantPropagation.cpp
+18
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@@ -215,6 +215,24 @@ void FoldInstruction(Block& block, Block::iterator instruction,
return;
case ValueOpcode::SelectU32:
case ValueOpcode::SelectF32: FoldSelect(inst); return;
case ValueOpcode::FPCmpClass32: {
const auto mask = Arg(inst, 1);
if (!IsImmediate(mask, Type::U32)) {
return;
}
switch (mask.U32() & 0x3ffu) {
case 0u: Replace(inst, Value(false)); break;
case 0x3ffu: Replace(inst, Value(true)); break;
case 3u: {
const auto result = block.PrependNewInst(
instruction, ValueOpcode::FPIsNan32, {Arg(inst, 0)});
Replace(inst, Value(&*result));
break;
}
default: break;
}
return;
}
case ValueOpcode::BitFieldInsert: {
const auto base = Arg(inst, 0);
const auto insert = Arg(inst, 1);