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shader: fold complementary masks so wave reductions see full EXEC

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Co-authored-by: Senaxx <michelbeld@gmail.com>
Co-authored-by: Mac <me@itsmemac.com>
This commit is contained in:
nmzikSenaxxMac
 committed 2026-10-26 05:32:02 +01:00
1 parent 6357740fa1
commit ce5e57aa36
3 files changed
+66 -92
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src/graphics/shader/recompiler/ir/passes/ConstantPropagation.cpp
+15 -2
View File
@@ -167,6 +167,16 @@ bool ReplaceBinaryIdentity(Inst& inst, Type type, uint64_t identity) {
return false;
}
// Whether one operand is the other's negation.
bool IsComplementPair(const Inst& inst, ValueOpcode negation) {
for (uint32_t arg = 0; arg < 2u; ++arg) {
const auto* negate = Arg(inst, arg).TryInstruction();
if (negate != nullptr && negate->GetOpcode() == negation &&
Arg(*negate, 0) == Arg(inst, arg ^ 1u)) return true;
}
return false;
}
bool FoldSelect(Inst& inst) {
const auto condition = Arg(inst, 0);
const auto true_value = Arg(inst, 1);
@@ -626,8 +636,9 @@ void FoldInstruction(Block& block, Block::iterator instruction,
case ValueOpcode::BitwiseXor32:
if (!FoldU32(inst, [opcode = inst.GetOpcode()](uint32_t a, uint32_t b) {
return opcode == ValueOpcode::BitwiseOr32 ? a | b : a ^ b;
})) {
ReplaceBinaryIdentity(inst, Type::U32, 0u);
}) && !ReplaceBinaryIdentity(inst, Type::U32, 0u) &&
IsComplementPair(inst, ValueOpcode::BitwiseNot32)) {
Replace(inst, Value(UINT32_MAX));
}
return;
case ValueOpcode::BitwiseNot32: {
@@ -802,6 +813,8 @@ void FoldInstruction(Block& block, Block::iterator instruction,
Replace(inst, lhs.U1() ? lhs : rhs);
} else if (IsImmediate(rhs, Type::U1)) {
Replace(inst, rhs.U1() ? rhs : lhs);
} else if (IsComplementPair(inst, ValueOpcode::LogicalNot)) {
Replace(inst, Value(true));
} else {
const auto* left = lhs.TryInstruction();
const auto* right = rhs.TryInstruction();