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[CodeGen,AArch64] Fix up warnings in performExtendCombine

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Try to avoid calling getVectorNumElements() or relying upon the
TypeSize conversion to uin64_t.

Differential Revision: https://reviews.llvm.org/D81573
This commit is contained in:
David Sherwood 2020-06-10 14:37:25 +01:00
parent aacaa16559
commit 589444b8e2
1 changed files with 8 additions and 11 deletions
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19
lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -11897,14 +11897,14 @@ static SDValue performExtendCombine(SDNode *N,
if (!ResVT.isSimple() || !SrcVT.isSimple())
return SDValue();
// If the source VT is a 64-bit vector, we can play games and get the
// better results we want.
if (SrcVT.getSizeInBits() != 64)
// If the source VT is a 64-bit fixed or scalable vector, we can play games
// and get the better results we want.
if (SrcVT.getSizeInBits().getKnownMinSize() != 64)
return SDValue();
unsigned SrcEltSize = SrcVT.getScalarSizeInBits();
unsigned ElementCount = SrcVT.getVectorNumElements();
SrcVT = MVT::getVectorVT(MVT::getIntegerVT(SrcEltSize * 2), ElementCount);
ElementCount SrcEC = SrcVT.getVectorElementCount();
SrcVT = MVT::getVectorVT(MVT::getIntegerVT(SrcEltSize * 2), SrcEC);
SDLoc DL(N);
Src = DAG.getNode(N->getOpcode(), DL, SrcVT, Src);
@ -11912,17 +11912,14 @@ static SDValue performExtendCombine(SDNode *N,
// bit source.
EVT LoVT, HiVT;
SDValue Lo, Hi;
unsigned NumElements = ResVT.getVectorNumElements();
assert(!(NumElements & 1) && "Splitting vector, but not in half!");
LoVT = HiVT = EVT::getVectorVT(*DAG.getContext(),
ResVT.getVectorElementType(), NumElements / 2);
LoVT = HiVT = ResVT.getHalfNumVectorElementsVT(*DAG.getContext());
EVT InNVT = EVT::getVectorVT(*DAG.getContext(), SrcVT.getVectorElementType(),
LoVT.getVectorNumElements());
LoVT.getVectorElementCount());
Lo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InNVT, Src,
DAG.getConstant(0, DL, MVT::i64));
Hi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InNVT, Src,
DAG.getConstant(InNVT.getVectorNumElements(), DL, MVT::i64));
DAG.getConstant(InNVT.getVectorMinNumElements(), DL, MVT::i64));
Lo = DAG.getNode(N->getOpcode(), DL, LoVT, Lo);
Hi = DAG.getNode(N->getOpcode(), DL, HiVT, Hi);