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Be careful not to optimize a SELECT_CC into a SETCC post-legalization if the SETCC node would be illegal.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167344 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2012-11-03 00:17:26 +00:00
parent 11a45c214c
commit efcc1aec64
1 changed files with 29 additions and 25 deletions
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54
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -9412,34 +9412,38 @@ SDValue DAGCombiner::SimplifySelectCC(DebugLoc DL, SDValue N0, SDValue N1,
return SDValue();
// Get a SetCC of the condition
// FIXME: Should probably make sure that setcc is legal if we ever have a
// target where it isn't.
SDValue Temp, SCC;
// cast from setcc result type to select result type
if (LegalTypes) {
SCC = DAG.getSetCC(DL, TLI.getSetCCResultType(N0.getValueType()),
N0, N1, CC);
if (N2.getValueType().bitsLT(SCC.getValueType()))
Temp = DAG.getZeroExtendInReg(SCC, N2.getDebugLoc(), N2.getValueType());
else
// NOTE: Don't create a SETCC if it's not legal on this target.
if (!LegalOperations ||
TLI.isOperationLegal(ISD::SETCC,
LegalTypes ? TLI.getSetCCResultType(N0.getValueType()) : MVT::i1)) {
SDValue Temp, SCC;
// cast from setcc result type to select result type
if (LegalTypes) {
SCC = DAG.getSetCC(DL, TLI.getSetCCResultType(N0.getValueType()),
N0, N1, CC);
if (N2.getValueType().bitsLT(SCC.getValueType()))
Temp = DAG.getZeroExtendInReg(SCC, N2.getDebugLoc(),
N2.getValueType());
else
Temp = DAG.getNode(ISD::ZERO_EXTEND, N2.getDebugLoc(),
N2.getValueType(), SCC);
} else {
SCC = DAG.getSetCC(N0.getDebugLoc(), MVT::i1, N0, N1, CC);
Temp = DAG.getNode(ISD::ZERO_EXTEND, N2.getDebugLoc(),
N2.getValueType(), SCC);
} else {
SCC = DAG.getSetCC(N0.getDebugLoc(), MVT::i1, N0, N1, CC);
Temp = DAG.getNode(ISD::ZERO_EXTEND, N2.getDebugLoc(),
N2.getValueType(), SCC);
}
AddToWorkList(SCC.getNode());
AddToWorkList(Temp.getNode());
if (N2C->getAPIntValue() == 1)
return Temp;
// shl setcc result by log2 n2c
return DAG.getNode(ISD::SHL, DL, N2.getValueType(), Temp,
DAG.getConstant(N2C->getAPIntValue().logBase2(),
getShiftAmountTy(Temp.getValueType())));
}
AddToWorkList(SCC.getNode());
AddToWorkList(Temp.getNode());
if (N2C->getAPIntValue() == 1)
return Temp;
// shl setcc result by log2 n2c
return DAG.getNode(ISD::SHL, DL, N2.getValueType(), Temp,
DAG.getConstant(N2C->getAPIntValue().logBase2(),
getShiftAmountTy(Temp.getValueType())));
}
// Check to see if this is the equivalent of setcc