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Make isMOVDDUP mask check more strict and update comments!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138587 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2011-08-25 21:40:34 +00:00
parent 32c371f0df
commit 06ef923d14
1 changed files with 7 additions and 2 deletions
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9
lib/Target/X86/X86ISelLowering.cpp
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@ -3914,10 +3914,15 @@ bool X86::isMOVSLDUPMask(ShuffleVectorSDNode *N,
}
/// isMOVDDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVDDUP.
/// specifies a shuffle of elements that is suitable for input to 128-bit
/// version of MOVDDUP.
bool X86::isMOVDDUPMask(ShuffleVectorSDNode *N) {
int e = N->getValueType(0).getVectorNumElements() / 2;
EVT VT = N->getValueType(0);
if (VT.getSizeInBits() != 128)
return false;
int e = VT.getVectorNumElements() / 2;
for (int i = 0; i < e; ++i)
if (!isUndefOrEqual(N->getMaskElt(i), i))
return false;