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OpcodeDispatcher: drop useless zext in shld

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this gets deleted by an upcoming opt pass, but we shouldn't be depending on
the opt pass for it!

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig committed 2025-03-24 16:00:24 -04:00
1 parent 2887416b2e
commit e26b9b12fa
1 file changed
+4 -3
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+4 -3
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@@ -1421,14 +1421,15 @@ void OpDispatchBuilder::SHLDOp(OpcodeArgs) {
// Calculate flags early.
CalculateDeferredFlags();
Ref Src = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags);
const auto Size = GetSrcBitSize(Op);
// Allow garbage on the Src if it will be ignored by the Lshr below
Ref Src = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = Size >= 32});
Ref Dest = LoadSource(GPRClass, Op, Op->Dest, Op->Flags);
// Allow garbage on the shift, we're masking it anyway.
Ref Shift = LoadSource(GPRClass, Op, Op->Src[1], Op->Flags, {.AllowUpperGarbage = true});
const auto Size = GetSrcBitSize(Op);
// x86 masks the shift by 0x3F or 0x1F depending on size of op.
if (Size == 64) {
Shift = _And(OpSize::i64Bit, Shift, _InlineConstant(0x3F));