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[X86] SimplifyDemandedVectorEltsForTargetNode - Move SUBV_BROADCAST narrowing handling. NFCI. 

Move the narrowing of SUBV_BROADCAST to where we handle all the other opcodes.

llvm-svn: 366660
This commit is contained in:
Simon Pilgrim 2019-07-21 19:04:44 +00:00
parent 73d641a23c
commit 86fa3270ef
1 changed files with 13 additions and 19 deletions
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32
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -34062,25 +34062,6 @@ bool X86TargetLowering::SimplifyDemandedVectorEltsForTargetNode(
return true;
break;
}
case X86ISD::SUBV_BROADCAST: {
// Reduce size of broadcast if we don't need the upper half.
unsigned HalfElts = NumElts / 2;
if (DemandedElts.extractBits(HalfElts, HalfElts).isNullValue()) {
SDValue Src = Op.getOperand(0);
MVT SrcVT = Src.getSimpleValueType();
SDValue Half = Src;
if (SrcVT.getVectorNumElements() != HalfElts) {
MVT HalfVT = MVT::getVectorVT(SrcVT.getScalarType(), HalfElts);
Half = TLO.DAG.getNode(X86ISD::SUBV_BROADCAST, SDLoc(Op), HalfVT, Src);
}
return TLO.CombineTo(Op, insertSubVector(TLO.DAG.getUNDEF(VT), Half, 0,
TLO.DAG, SDLoc(Op),
Half.getValueSizeInBits()));
}
break;
}
case X86ISD::VPERMV: {
SDValue Mask = Op.getOperand(0);
APInt MaskUndef, MaskZero;
@ -34134,6 +34115,19 @@ bool X86TargetLowering::SimplifyDemandedVectorEltsForTargetNode(
SDValue Insert =
insertSubVector(UndefVec, ExtOp, 0, TLO.DAG, DL, ExtSizeInBits);
return TLO.CombineTo(Op, Insert);
}
// Subvector broadcast.
case X86ISD::SUBV_BROADCAST: {
SDLoc DL(Op);
SDValue Ext = Op.getOperand(0);
if (Ext.getValueSizeInBits() != ExtSizeInBits) {
MVT ExtSVT = Ext.getSimpleValueType().getScalarType();
MVT ExtVT =
MVT::getVectorVT(ExtSVT, ExtSizeInBits / ExtSVT.getSizeInBits());
Ext = TLO.DAG.getNode(X86ISD::SUBV_BROADCAST, DL, ExtVT, Ext);
}
return TLO.CombineTo(Op, insertSubVector(TLO.DAG.getUNDEF(VT), Ext, 0,
TLO.DAG, DL, ExtSizeInBits));
}
// Byte shifts by immediate.
case X86ISD::VSHLDQ: