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shader: keep mask predicates across 64-bit moves

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This commit is contained in:
nmzik
2026-09-07 07:04:55 +04:00
parent ad935311f0
commit 8bccd325ec
1 changed files with 20 additions and 8 deletions
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src/graphics/shader/recompiler/frontend/translate/Control.cpp
+20 -8
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@@ -240,18 +240,30 @@ void Translator::MOV_B32(const Decoder::Instruction& inst, bool apply_float_modi
}
void Translator::S_MOV_B64(const Decoder::Instruction& inst) {
const bool scalar_copy =
inst.dst.kind == Decoder::OperandKind::Sgpr && inst.src0.kind == Decoder::OperandKind::Sgpr;
const bool mask_source = inst.src0.kind == Decoder::OperandKind::Sgpr ||
inst.src0.kind == Decoder::OperandKind::ExecLo ||
inst.src0.kind == Decoder::OperandKind::VccLo;
IR::U1 source_mask;
IR::U1 source_mask_valid;
if (scalar_copy) {
source_mask = ir.GetThreadBitScalarReg(static_cast<IR::ScalarReg>(inst.src0.reg));
source_mask_valid = ir.GetScalarMaskTag(static_cast<IR::ScalarReg>(inst.src0.reg));
if (mask_source) {
// A full VCC copy carries its predicate even in wave32; ReadMask also handles
// individual 32-bit VCC halves, which cannot preserve that provenance.
source_mask = inst.src0.kind == Decoder::OperandKind::VccLo ? ir.GetVcc()
: ReadMask(inst.src0);
source_mask_valid = ReadMaskValid(inst.src0);
}
// Preserve all 64 scalar bits independently of the per-thread predicate.
WriteU32Pair(inst.dst, ReadU32Pair(inst.src0));
if (scalar_copy) {
ir.SetThreadBitScalarReg(static_cast<IR::ScalarReg>(inst.dst.reg), source_mask);
ir.SetScalarMaskTag(static_cast<IR::ScalarReg>(inst.dst.reg), source_mask_valid);
if (mask_source) {
switch (inst.dst.kind) {
case Decoder::OperandKind::ExecLo: ir.SetExec(source_mask); break;
case Decoder::OperandKind::VccLo: ir.SetVcc(source_mask); break;
case Decoder::OperandKind::Sgpr:
ir.SetThreadBitScalarReg(static_cast<IR::ScalarReg>(inst.dst.reg), source_mask);
ir.SetScalarMaskTag(static_cast<IR::ScalarReg>(inst.dst.reg), source_mask_valid);
break;
default: break;
}
}
}