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[SelectionDAG] Make use of KnownBits::commonBits. NFC.

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Differential Revision: https://reviews.llvm.org/D94587
This commit is contained in:
Jay Foad 2021-01-13 10:57:20 +00:00
parent 4aa6e58a81
commit 3959fb7bf5
2 changed files with 13 additions and 26 deletions
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3
lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
View File

@ -509,8 +509,7 @@ void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
return;
}
DestLOI.NumSignBits = std::min(DestLOI.NumSignBits, SrcLOI->NumSignBits);
DestLOI.Known.Zero &= SrcLOI->Known.Zero;
DestLOI.Known.One &= SrcLOI->Known.One;
DestLOI.Known = KnownBits::commonBits(DestLOI.Known, SrcLOI->Known);
}
}

36
lib/CodeGen/SelectionDAG/TargetLowering.cpp
View File

@ -1016,10 +1016,8 @@ bool TargetLowering::SimplifyDemandedBits(
Depth + 1))
return true;
if (!!DemandedVecElts) {
Known.One &= KnownVec.One;
Known.Zero &= KnownVec.Zero;
}
if (!!DemandedVecElts)
Known = KnownBits::commonBits(Known, KnownVec);
return false;
}
@ -1044,14 +1042,10 @@ bool TargetLowering::SimplifyDemandedBits(
Known.Zero.setAllBits();
Known.One.setAllBits();
if (!!DemandedSubElts) {
Known.One &= KnownSub.One;
Known.Zero &= KnownSub.Zero;
}
if (!!DemandedSrcElts) {
Known.One &= KnownSrc.One;
Known.Zero &= KnownSrc.Zero;
}
if (!!DemandedSubElts)
Known = KnownBits::commonBits(Known, KnownSub);
if (!!DemandedSrcElts)
Known = KnownBits::commonBits(Known, KnownSrc);
// Attempt to avoid multi-use src if we don't need anything from it.
if (!DemandedBits.isAllOnesValue() || !DemandedSubElts.isAllOnesValue() ||
@ -1108,10 +1102,8 @@ bool TargetLowering::SimplifyDemandedBits(
Known2, TLO, Depth + 1))
return true;
// Known bits are shared by every demanded subvector element.
if (!!DemandedSubElts) {
Known.One &= Known2.One;
Known.Zero &= Known2.Zero;
}
if (!!DemandedSubElts)
Known = KnownBits::commonBits(Known, Known2);
}
break;
}
@ -1149,15 +1141,13 @@ bool TargetLowering::SimplifyDemandedBits(
if (SimplifyDemandedBits(Op0, DemandedBits, DemandedLHS, Known2, TLO,
Depth + 1))
return true;
Known.One &= Known2.One;
Known.Zero &= Known2.Zero;
Known = KnownBits::commonBits(Known, Known2);
}
if (!!DemandedRHS) {
if (SimplifyDemandedBits(Op1, DemandedBits, DemandedRHS, Known2, TLO,
Depth + 1))
return true;
Known.One &= Known2.One;
Known.Zero &= Known2.Zero;
Known = KnownBits::commonBits(Known, Known2);
}
// Attempt to avoid multi-use ops if we don't need anything from them.
@ -1384,8 +1374,7 @@ bool TargetLowering::SimplifyDemandedBits(
return true;
// Only known if known in both the LHS and RHS.
Known.One &= Known2.One;
Known.Zero &= Known2.Zero;
Known = KnownBits::commonBits(Known, Known2);
break;
case ISD::SELECT_CC:
if (SimplifyDemandedBits(Op.getOperand(3), DemandedBits, Known, TLO,
@ -1402,8 +1391,7 @@ bool TargetLowering::SimplifyDemandedBits(
return true;
// Only known if known in both the LHS and RHS.
Known.One &= Known2.One;
Known.Zero &= Known2.Zero;
Known = KnownBits::commonBits(Known, Known2);
break;
case ISD::SETCC: {
SDValue Op0 = Op.getOperand(0);