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OpcodeDispatcher: optimize asr masking

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
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Alyssa Rosenzweig committed 2024-05-23 08:27:13 -04:00
1 parent aa3a92aa60
commit 2bbcf72e27
1 file changed
+5 -1
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+5 -1
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@@ -1677,7 +1677,11 @@ void OpDispatchBuilder::ASHROp(OpcodeArgs) {
const auto Size = GetSrcSize(Op);
const auto OpSize = std::max<uint8_t>(4, GetDstSize(Op));
auto Dest = LoadSource(GPRClass, Op, Op->Dest, Op->Flags);
// If Size < 4, then we Sbfe the Dest so we can have garbage.
// Otherwise, if Size = Opsize, then both are 4 or 8 and match the a64
// semantics directly, so again we can have garbage. The only case where we
// need zero-extension here is when the sizes mismatch.
auto Dest = LoadSource(GPRClass, Op, Op->Dest, Op->Flags, {.AllowUpperGarbage = (OpSize == Size) || (Size < 4)});
if (Size < 4) {
Dest = _Sbfe(OpSize::i64Bit, Size * 8, 0, Dest);