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Rename some variables to have meaningful names. NFC. 

llvm-svn: 280391
This commit is contained in:
Michael Kuperstein 2016-09-01 18:24:42 +00:00
parent 922af076c7
commit b4743597bd
1 changed files with 28 additions and 28 deletions
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54
llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
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@ -2838,51 +2838,51 @@ void DAGTypeLegalizer::IntegerExpandSetCCOperands(SDValue &NewLHS,
case ISD::SETUGE: LowCC = ISD::SETUGE; break;
}
// Tmp1 = lo(op1) < lo(op2) // Always unsigned comparison
// Tmp2 = hi(op1) < hi(op2) // Signedness depends on operands
// dest = hi(op1) == hi(op2) ? Tmp1 : Tmp2;
// LoCmp = lo(op1) < lo(op2) // Always unsigned comparison
// HiCmp = hi(op1) < hi(op2) // Signedness depends on operands
// dest = hi(op1) == hi(op2) ? LoCmp : HiCmp;
// NOTE: on targets without efficient SELECT of bools, we can always use
// this identity: (B1 ? B2 : B3) --> (B1 & B2)|(!B1&B3)
TargetLowering::DAGCombinerInfo DagCombineInfo(DAG, AfterLegalizeTypes, true,
nullptr);
SDValue Tmp1, Tmp2;
SDValue LoCmp, HiCmp;
if (TLI.isTypeLegal(LHSLo.getValueType()) &&
TLI.isTypeLegal(RHSLo.getValueType()))
Tmp1 = TLI.SimplifySetCC(getSetCCResultType(LHSLo.getValueType()),
LHSLo, RHSLo, LowCC, false, DagCombineInfo, dl);
if (!Tmp1.getNode())
Tmp1 = DAG.getSetCC(dl, getSetCCResultType(LHSLo.getValueType()),
LHSLo, RHSLo, LowCC);
LoCmp = TLI.SimplifySetCC(getSetCCResultType(LHSLo.getValueType()), LHSLo,
RHSLo, LowCC, false, DagCombineInfo, dl);
if (!LoCmp.getNode())
LoCmp = DAG.getSetCC(dl, getSetCCResultType(LHSLo.getValueType()), LHSLo,
RHSLo, LowCC);
if (TLI.isTypeLegal(LHSHi.getValueType()) &&
TLI.isTypeLegal(RHSHi.getValueType()))
Tmp2 = TLI.SimplifySetCC(getSetCCResultType(LHSHi.getValueType()),
LHSHi, RHSHi, CCCode, false, DagCombineInfo, dl);
if (!Tmp2.getNode())
Tmp2 = DAG.getNode(ISD::SETCC, dl,
getSetCCResultType(LHSHi.getValueType()),
HiCmp = TLI.SimplifySetCC(getSetCCResultType(LHSHi.getValueType()), LHSHi,
RHSHi, CCCode, false, DagCombineInfo, dl);
if (!HiCmp.getNode())
HiCmp =
DAG.getNode(ISD::SETCC, dl, getSetCCResultType(LHSHi.getValueType()),
LHSHi, RHSHi, DAG.getCondCode(CCCode));
ConstantSDNode *Tmp1C = dyn_cast<ConstantSDNode>(Tmp1.getNode());
ConstantSDNode *Tmp2C = dyn_cast<ConstantSDNode>(Tmp2.getNode());
if ((Tmp1C && Tmp1C->isNullValue()) ||
(Tmp2C && Tmp2C->isNullValue() &&
(CCCode == ISD::SETLE || CCCode == ISD::SETGE ||
CCCode == ISD::SETUGE || CCCode == ISD::SETULE)) ||
(Tmp2C && Tmp2C->getAPIntValue() == 1 &&
(CCCode == ISD::SETLT || CCCode == ISD::SETGT ||
CCCode == ISD::SETUGT || CCCode == ISD::SETULT))) {
ConstantSDNode *LoCmpC = dyn_cast<ConstantSDNode>(LoCmp.getNode());
ConstantSDNode *HiCmpC = dyn_cast<ConstantSDNode>(HiCmp.getNode());
if ((LoCmpC && LoCmpC->isNullValue()) ||
(HiCmpC && HiCmpC->isNullValue() &&
(CCCode == ISD::SETLE || CCCode == ISD::SETGE || CCCode == ISD::SETUGE ||
CCCode == ISD::SETULE)) ||
(HiCmpC && HiCmpC->getAPIntValue() == 1 &&
(CCCode == ISD::SETLT || CCCode == ISD::SETGT || CCCode == ISD::SETUGT ||
CCCode == ISD::SETULT))) {
// low part is known false, returns high part.
// For LE / GE, if high part is known false, ignore the low part.
// For LT / GT, if high part is known true, ignore the low part.
NewLHS = Tmp2;
NewLHS = HiCmp;
NewRHS = SDValue();
return;
}
if (LHSHi == RHSHi) {
// Comparing the low bits is enough.
NewLHS = Tmp1;
NewLHS = LoCmp;
NewRHS = SDValue();
return;
}
@ -2927,8 +2927,8 @@ void DAGTypeLegalizer::IntegerExpandSetCCOperands(SDValue &NewLHS,
if (!NewLHS.getNode())
NewLHS = DAG.getSetCC(dl, getSetCCResultType(LHSHi.getValueType()),
LHSHi, RHSHi, ISD::SETEQ);
NewLHS = DAG.getSelect(dl, Tmp1.getValueType(),
NewLHS, Tmp1, Tmp2);
NewLHS = DAG.getSelect(dl, LoCmp.getValueType(),
NewLHS, LoCmp, HiCmp);
NewRHS = SDValue();
}