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Fixes bugs in PSHUFB

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If bits were set in the reserved bits then the shuffle was incorrect
This commit is contained in:
Ryan Houdek 2020-10-04 16:10:03 -07:00
parent 9c7cc2db1f
commit 4ff7046ddb
1 changed files with 15 additions and 0 deletions
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15
External/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp vendored
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@ -3932,6 +3932,21 @@ void OpDispatchBuilder::PSHUFBOp(OpcodeArgs) {
OrderedNode *Dest = LoadSource(FPRClass, Op, Op->Dest, Op->Flags, -1);
OrderedNode *Src = LoadSource(FPRClass, Op, Op->Src[0], Op->Flags, -1);
// PSHUFB doesn't 100% match VTBL behaviour
// VTBL will set the element zero if the index is greater than the number of elements
// In the array
// Bit 7 is the only bit that is supposed to set elements to zero with PSHUFB
// Mask the selection bits and top bit correctly
// Bits [6:4] is reserved for 128bit
// Bits [6:3] is reserved for 64bit
if (Size == 8) {
auto MaskVector = _VectorImm(0b1000'0111, Size, 1);
Src = _VAnd(Size, Size, Src, MaskVector);
}
else {
auto MaskVector = _VectorImm(0b1000'1111, Size, 1);
Src = _VAnd(Size, Size, Src, MaskVector);
}
auto Res = _VTBL1(Size, Dest, Src);
StoreResult(FPRClass, Op, Res, -1);
}