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[X86] truncateVectorCompareWithPACKSS - remove duplicate variables. NFCI. 

llvm-svn: 316440
This commit is contained in:
Simon Pilgrim 2017-10-24 14:18:32 +00:00
parent 59b48302a3
commit c36dd6ae9c
1 changed files with 10 additions and 11 deletions
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21
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -15962,21 +15962,20 @@ static SDValue truncateVectorCompareWithPACKSS(EVT DstVT, SDValue In,
// We only support vector truncation to 128bits or greater from a
// 256bits or greater source.
if ((DstVT.getSizeInBits() % 128) != 0)
return SDValue();
if ((SrcVT.getSizeInBits() % 256) != 0)
unsigned DstSizeInBits = DstVT.getSizeInBits();
unsigned SrcSizeInBits = SrcVT.getSizeInBits();
if ((DstSizeInBits % 128) != 0 || (SrcSizeInBits % 256) != 0)
return SDValue();
LLVMContext &Ctx = *DAG.getContext();
unsigned NumElems = SrcVT.getVectorNumElements();
assert(DstVT.getVectorNumElements() == NumElems && "Illegal truncation");
assert(SrcVT.getSizeInBits() > DstVT.getSizeInBits() && "Illegal truncation");
assert(SrcSizeInBits > DstSizeInBits && "Illegal truncation");
EVT PackedSVT =
EVT::getIntegerVT(*DAG.getContext(), SrcVT.getScalarSizeInBits() / 2);
EVT PackedSVT = EVT::getIntegerVT(Ctx, SrcVT.getScalarSizeInBits() / 2);
// Extract lower/upper subvectors.
unsigned NumSubElts = NumElems / 2;
unsigned SrcSizeInBits = SrcVT.getSizeInBits();
SDValue Lo = extractSubVector(In, 0 * NumSubElts, DAG, DL, SrcSizeInBits / 2);
SDValue Hi = extractSubVector(In, 1 * NumSubElts, DAG, DL, SrcSizeInBits / 2);
@ -16004,18 +16003,18 @@ static SDValue truncateVectorCompareWithPACKSS(EVT DstVT, SDValue In,
return DAG.getBitcast(DstVT, Res);
// If 512bit -> 128bit truncate another stage.
EVT PackedVT = EVT::getVectorVT(*DAG.getContext(), PackedSVT, NumElems);
EVT PackedVT = EVT::getVectorVT(Ctx, PackedSVT, NumElems);
Res = DAG.getBitcast(PackedVT, Res);
return truncateVectorCompareWithPACKSS(DstVT, Res, DL, DAG, Subtarget);
}
// Recursively pack lower/upper subvectors, concat result and pack again.
assert(SrcVT.getSizeInBits() >= 512 && "Expected 512-bit vector or greater");
EVT PackedVT = EVT::getVectorVT(*DAG.getContext(), PackedSVT, NumElems / 2);
assert(SrcSizeInBits >= 512 && "Expected 512-bit vector or greater");
EVT PackedVT = EVT::getVectorVT(Ctx, PackedSVT, NumSubElts);
Lo = truncateVectorCompareWithPACKSS(PackedVT, Lo, DL, DAG, Subtarget);
Hi = truncateVectorCompareWithPACKSS(PackedVT, Hi, DL, DAG, Subtarget);
PackedVT = EVT::getVectorVT(*DAG.getContext(), PackedSVT, NumElems);
PackedVT = EVT::getVectorVT(Ctx, PackedSVT, NumElems);
SDValue Res = DAG.getNode(ISD::CONCAT_VECTORS, DL, PackedVT, Lo, Hi);
return truncateVectorCompareWithPACKSS(DstVT, Res, DL, DAG, Subtarget);
}