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[TargetLowering] use local variables to reduce duplication; NFCI 

llvm-svn: 324397
This commit is contained in:
Sanjay Patel 2018-02-06 20:49:28 +00:00
parent dc797c0b55
commit e96a9014ab
1 changed files with 6 additions and 6 deletions
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12
llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -1232,10 +1232,11 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
case ISD::SUB: {
// Add, Sub, and Mul don't demand any bits in positions beyond that
// of the highest bit demanded of them.
APInt LoMask = APInt::getLowBitsSet(BitWidth,
BitWidth - NewMask.countLeadingZeros());
if (SimplifyDemandedBits(Op.getOperand(0), LoMask, Known2, TLO, Depth+1) ||
SimplifyDemandedBits(Op.getOperand(1), LoMask, Known2, TLO, Depth+1) ||
SDValue Op0 = Op.getOperand(0), Op1 = Op.getOperand(1);
unsigned NewMaskLZ = NewMask.countLeadingZeros();
APInt LoMask = APInt::getLowBitsSet(BitWidth, BitWidth - NewMaskLZ);
if (SimplifyDemandedBits(Op0, LoMask, Known2, TLO, Depth + 1) ||
SimplifyDemandedBits(Op1, LoMask, Known2, TLO, Depth + 1) ||
// See if the operation should be performed at a smaller bit width.
ShrinkDemandedOp(Op, BitWidth, NewMask, TLO)) {
SDNodeFlags Flags = Op.getNode()->getFlags();
@ -1245,8 +1246,7 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
Flags.setNoSignedWrap(false);
Flags.setNoUnsignedWrap(false);
SDValue NewOp = TLO.DAG.getNode(Op.getOpcode(), dl, Op.getValueType(),
Op.getOperand(0), Op.getOperand(1),
Flags);
Op0, Op1, Flags);
return TLO.CombineTo(Op, NewOp);
}
return true;