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Propagate debug loc info in ADDC and ADDE.

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llvm-svn: 63367
This commit is contained in:
Bill Wendling 2009-01-30 02:38:00 +00:00
parent 1ad9d3d9d1
commit 665afce822
1 changed files with 13 additions and 11 deletions
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24
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1135,22 +1135,25 @@ SDValue DAGCombiner::visitADDC(SDNode *N) {
// If the flag result is dead, turn this into an ADD.
if (N->hasNUsesOfValue(0, 1))
return CombineTo(N, DAG.getNode(ISD::ADD, VT, N1, N0),
DAG.getNode(ISD::CARRY_FALSE, MVT::Flag));
return CombineTo(N, DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N1, N0),
DAG.getNode(ISD::CARRY_FALSE,
N->getDebugLoc(), MVT::Flag));
// canonicalize constant to RHS.
if (N0C && !N1C)
return DAG.getNode(ISD::ADDC, N->getVTList(), N1, N0);
return DAG.getNode(ISD::ADDC, N->getDebugLoc(), N->getVTList(), N1, N0);
// fold (addc x, 0) -> x + no carry out
if (N1C && N1C->isNullValue())
return CombineTo(N, N0, DAG.getNode(ISD::CARRY_FALSE, MVT::Flag));
return CombineTo(N, N0, DAG.getNode(ISD::CARRY_FALSE,
N->getDebugLoc(), MVT::Flag));
// fold (addc a, b) -> (or a, b), CARRY_FALSE iff a and b share no bits.
APInt LHSZero, LHSOne;
APInt RHSZero, RHSOne;
APInt Mask = APInt::getAllOnesValue(VT.getSizeInBits());
DAG.ComputeMaskedBits(N0, Mask, LHSZero, LHSOne);
if (LHSZero.getBoolValue()) {
DAG.ComputeMaskedBits(N1, Mask, RHSZero, RHSOne);
@ -1158,8 +1161,9 @@ SDValue DAGCombiner::visitADDC(SDNode *N) {
// If all possibly-set bits on the RHS are clear on the LHS, return an OR.
if ((RHSZero & (~LHSZero & Mask)) == (~LHSZero & Mask) ||
(LHSZero & (~RHSZero & Mask)) == (~RHSZero & Mask))
return CombineTo(N, DAG.getNode(ISD::OR, VT, N0, N1),
DAG.getNode(ISD::CARRY_FALSE, MVT::Flag));
return CombineTo(N, DAG.getNode(ISD::OR, N->getDebugLoc(), VT, N0, N1),
DAG.getNode(ISD::CARRY_FALSE,
N->getDebugLoc(), MVT::Flag));
}
return SDValue();
@ -1171,21 +1175,19 @@ SDValue DAGCombiner::visitADDE(SDNode *N) {
SDValue CarryIn = N->getOperand(2);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
//MVT VT = N0.getValueType();
// canonicalize constant to RHS
if (N0C && !N1C)
return DAG.getNode(ISD::ADDE, N->getVTList(), N1, N0, CarryIn);
return DAG.getNode(ISD::ADDE, N->getDebugLoc(), N->getVTList(),
N1, N0, CarryIn);
// fold (adde x, y, false) -> (addc x, y)
if (CarryIn.getOpcode() == ISD::CARRY_FALSE)
return DAG.getNode(ISD::ADDC, N->getVTList(), N1, N0);
return DAG.getNode(ISD::ADDC, N->getDebugLoc(), N->getVTList(), N1, N0);
return SDValue();
}
SDValue DAGCombiner::visitSUB(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);