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[InstCombine] reduce code duplication in foldBitcastExtElt(); NFC

This commit is contained in:
Sanjay Patel 2022-11-24 09:27:06 -05:00
parent 56279164f3
commit bf7f87e62c
1 changed files with 3 additions and 4 deletions
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7
llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
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@ -187,6 +187,7 @@ Instruction *InstCombinerImpl::foldBitcastExtElt(ExtractElementInst &Ext) {
ElementCount NumElts =
cast<VectorType>(Ext.getVectorOperandType())->getElementCount();
Type *DestTy = Ext.getType();
unsigned DestWidth = DestTy->getPrimitiveSizeInBits();
bool IsBigEndian = DL.isBigEndian();
// If we are casting an integer to vector and extracting a portion, that is
@ -201,12 +202,11 @@ Instruction *InstCombinerImpl::foldBitcastExtElt(ExtractElementInst &Ext) {
// BigEndian: extelt (bitcast i32 X to v4i8), 0 -> trunc i32 (X >> 24) to i8
if (IsBigEndian)
ExtIndexC = NumElts.getKnownMinValue() - 1 - ExtIndexC;
unsigned ShiftAmountC = ExtIndexC * DestTy->getPrimitiveSizeInBits();
unsigned ShiftAmountC = ExtIndexC * DestWidth;
if (!ShiftAmountC || Ext.getVectorOperand()->hasOneUse()) {
Value *Lshr = Builder.CreateLShr(X, ShiftAmountC, "extelt.offset");
if (DestTy->isFloatingPointTy()) {
Type *DstIntTy = IntegerType::getIntNTy(
Lshr->getContext(), DestTy->getPrimitiveSizeInBits());
Type *DstIntTy = IntegerType::getIntNTy(Lshr->getContext(), DestWidth);
Value *Trunc = Builder.CreateTrunc(Lshr, DstIntTy);
return new BitCastInst(Trunc, DestTy);
}
@ -283,7 +283,6 @@ Instruction *InstCombinerImpl::foldBitcastExtElt(ExtractElementInst &Ext) {
return nullptr;
unsigned SrcWidth = SrcTy->getScalarSizeInBits();
unsigned DestWidth = DestTy->getPrimitiveSizeInBits();
unsigned ShAmt = Chunk * DestWidth;
// TODO: This limitation is more strict than necessary. We could sum the