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Make SimplifyDemandedBits understand BUILD_PAIR

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208598 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-05-12 17:14:48 +00:00
parent db5b7e016a
commit 621299806c
2 changed files with 61 additions and 0 deletions
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25
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@@ -848,6 +848,31 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
}
break;
}
case ISD::BUILD_PAIR: {
EVT HalfVT = Op.getOperand(0).getValueType();
unsigned HalfBitWidth = HalfVT.getScalarSizeInBits();
APInt MaskLo = NewMask.getLoBits(HalfBitWidth).trunc(HalfBitWidth);
APInt MaskHi = NewMask.getHiBits(HalfBitWidth).trunc(HalfBitWidth);
APInt KnownZeroLo, KnownOneLo;
APInt KnownZeroHi, KnownOneHi;
if (SimplifyDemandedBits(Op.getOperand(0), MaskLo, KnownZeroLo,
KnownOneLo, TLO, Depth + 1))
return true;
if (SimplifyDemandedBits(Op.getOperand(1), MaskHi, KnownZeroHi,
KnownOneHi, TLO, Depth + 1))
return true;
KnownZero = KnownZeroLo.zext(BitWidth) |
KnownZeroHi.zext(BitWidth).shl(HalfBitWidth);
KnownOne = KnownOneLo.zext(BitWidth) |
KnownOneHi.zext(BitWidth).shl(HalfBitWidth);
break;
}
case ISD::ZERO_EXTEND: {
unsigned OperandBitWidth =
Op.getOperand(0).getValueType().getScalarType().getSizeInBits();