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[X86] Remove extract_subvector(subv_broadcast_load()) fold.

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This was needed in an earlier version of D92645, but isn't now - and I've just noticed that it was potentially flawed depending on the relevant widths of the broadcasted and extracted subvectors.
This commit is contained in:
Simon Pilgrim 2020-12-17 11:02:34 +00:00
parent 4e1f84e7cc
commit fdd8c22c46
1 changed files with 1 additions and 2 deletions
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lib/Target/X86/X86ISelLowering.cpp
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@ -49390,8 +49390,7 @@ static SDValue combineExtractSubvector(SDNode *N, SelectionDAG &DAG,
// extract the lowest subvector instead which should allow
// SimplifyDemandedVectorElts do more simplifications.
if (IdxVal != 0 && (InVec.getOpcode() == X86ISD::VBROADCAST ||
InVec.getOpcode() == X86ISD::VBROADCAST_LOAD ||
InVec.getOpcode() == X86ISD::SUBV_BROADCAST_LOAD))
InVec.getOpcode() == X86ISD::VBROADCAST_LOAD))
return extractSubVector(InVec, 0, DAG, SDLoc(N), SizeInBits);
// If we're extracting a broadcasted subvector, just use the source.