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[x86] Make computing the zeroable elements slightly more powerful, at 

least in theory.

I don't actually have a test case that benefits from this, but
theoretically, it could come up, and I don't want to try to think about
whether this is the culprit or something else is, so I'd rather just
make this code powerful. =/ Makes me sad that I can't really test it
though.

llvm-svn: 229298
This commit is contained in:
Chandler Carruth 2015-02-15 09:33:36 +00:00
parent 2ccbc08b8e
commit a6f8a3661c
1 changed files with 8 additions and 3 deletions
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11
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -7735,6 +7735,11 @@ static SmallBitVector computeZeroableShuffleElements(ArrayRef<int> Mask,
SDValue V1, SDValue V2) {
SmallBitVector Zeroable(Mask.size(), false);
while (V1.getOpcode() == ISD::BITCAST)
V1 = V1->getOperand(0);
while (V2.getOpcode() == ISD::BITCAST)
V2 = V2->getOperand(0);
bool V1IsZero = ISD::isBuildVectorAllZeros(V1.getNode());
bool V2IsZero = ISD::isBuildVectorAllZeros(V2.getNode());
@ -7746,10 +7751,10 @@ static SmallBitVector computeZeroableShuffleElements(ArrayRef<int> Mask,
continue;
}
// If this is an index into a build_vector node, dig out the input value and
// use it.
// If this is an index into a build_vector node (which has the same number
// of elements), dig out the input value and use it.
SDValue V = M < Size ? V1 : V2;
if (V.getOpcode() != ISD::BUILD_VECTOR)
if (V.getOpcode() != ISD::BUILD_VECTOR || Size != (int)V.getNumOperands())
continue;
SDValue Input = V.getOperand(M % Size);