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Make use of TLI.SimplifySetCC() in LegalizeSetCCOperands().

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llvm-svn: 34066
This commit is contained in:
Evan Cheng 2007-02-08 22:16:19 +00:00
parent 1b155ac243
commit 14f4a6715d
1 changed files with 36 additions and 8 deletions
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44
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -3732,7 +3732,8 @@ void SelectionDAGLegalize::LegalizeSetCCOperands(SDOperand &LHS,
// FIXME: This generated code sucks.
ISD::CondCode LowCC;
switch (cast<CondCodeSDNode>(CC)->get()) {
ISD::CondCode CCCode = cast<CondCodeSDNode>(CC)->get();
switch (CCCode) {
default: assert(0 && "Unknown integer setcc!");
case ISD::SETLT:
case ISD::SETULT: LowCC = ISD::SETULT; break;
@ -3750,13 +3751,40 @@ void SelectionDAGLegalize::LegalizeSetCCOperands(SDOperand &LHS,
// NOTE: on targets without efficient SELECT of bools, we can always use
// this identity: (B1 ? B2 : B3) --> (B1 & B2)|(!B1&B3)
Tmp1 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSLo, RHSLo, LowCC);
Tmp2 = DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(), LHSHi, RHSHi, CC);
Result = DAG.getSetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi, ISD::SETEQ);
Result = LegalizeOp(DAG.getNode(ISD::SELECT, Tmp1.getValueType(),
Result, Tmp1, Tmp2));
Tmp1 = Result;
Tmp2 = SDOperand();
TargetLowering::DAGCombinerInfo DagCombineInfo(DAG, false, true, NULL);
Tmp1 = TLI.SimplifySetCC(TLI.getSetCCResultTy(), LHSLo, RHSLo, LowCC,
false, DagCombineInfo);
if (!Tmp1.Val)
Tmp1 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSLo, RHSLo, LowCC);
Tmp2 = TLI.SimplifySetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi,
CCCode, false, DagCombineInfo);
if (!Tmp2.Val)
Tmp2 = DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(), LHSHi, RHSHi, CC);
ConstantSDNode *Tmp1C = dyn_cast<ConstantSDNode>(Tmp1.Val);
ConstantSDNode *Tmp2C = dyn_cast<ConstantSDNode>(Tmp2.Val);
if ((Tmp1C && Tmp1C->getValue() == 0) ||
(Tmp2C && Tmp2C->getValue() == 0 &&
(CCCode == ISD::SETLE || CCCode == ISD::SETGE ||
CCCode == ISD::SETUGE || CCCode == ISD::SETULE)) ||
(Tmp2C && Tmp2C->getValue() == 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.
Tmp1 = Tmp2;
Tmp2 = SDOperand();
} else {
Result = TLI.SimplifySetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi,
ISD::SETEQ, false, DagCombineInfo);
if (!Result.Val)
Result=DAG.getSetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi, ISD::SETEQ);
Result = LegalizeOp(DAG.getNode(ISD::SELECT, Tmp1.getValueType(),
Result, Tmp1, Tmp2));
Tmp1 = Result;
Tmp2 = SDOperand();
}
}
}
}