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[SelectionDAG] computeKnownBits - remove some duplicate/shadow variables. NFCI.

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llvm-svn: 359872
This commit is contained in:
Simon Pilgrim
2019-05-03 11:11:03 +00:00
parent a359ef192b
commit bfd00a6440
1 changed files with 4 additions and 6 deletions
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10
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -3059,21 +3059,20 @@ KnownBits SelectionDAG::computeKnownBits(SDValue Op, const APInt &DemandedElts,
case ISD::EXTRACT_ELEMENT: {
Known = computeKnownBits(Op.getOperand(0), Depth+1);
const unsigned Index = Op.getConstantOperandVal(1);
const unsigned BitWidth = Op.getValueSizeInBits();
const unsigned EltBitWidth = Op.getValueSizeInBits();
// Remove low part of known bits mask
Known.Zero = Known.Zero.getHiBits(Known.Zero.getBitWidth() - Index * BitWidth);
Known.One = Known.One.getHiBits(Known.One.getBitWidth() - Index * BitWidth);
Known.Zero = Known.Zero.getHiBits(Known.getBitWidth() - Index * EltBitWidth);
Known.One = Known.One.getHiBits(Known.getBitWidth() - Index * EltBitWidth);
// Remove high part of known bit mask
Known = Known.trunc(BitWidth);
Known = Known.trunc(EltBitWidth);
break;
}
case ISD::EXTRACT_VECTOR_ELT: {
SDValue InVec = Op.getOperand(0);
SDValue EltNo = Op.getOperand(1);
EVT VecVT = InVec.getValueType();
const unsigned BitWidth = Op.getValueSizeInBits();
const unsigned EltBitWidth = VecVT.getScalarSizeInBits();
const unsigned NumSrcElts = VecVT.getVectorNumElements();
// If BitWidth > EltBitWidth the value is anyext:ed. So we do not know
@@ -3670,7 +3669,6 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, const APInt &DemandedElts,
SDValue InVec = Op.getOperand(0);
SDValue InVal = Op.getOperand(1);
SDValue EltNo = Op.getOperand(2);
unsigned NumElts = InVec.getValueType().getVectorNumElements();
ConstantSDNode *CEltNo = dyn_cast<ConstantSDNode>(EltNo);
if (CEltNo && CEltNo->getAPIntValue().ult(NumElts)) {