if (ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0))
if (ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1)) {
// fold floating point (fadd c1, c2)
- return DAG.getConstantFP(N0CFP->getValue() + N1CFP->getValue(),
- N->getValueType(0));
+ return DAG.getConstantFP(N0CFP->getValue() + N1CFP->getValue(), VT);
}
// fold (A + (-B)) -> A-B
if (N1.getOpcode() == ISD::FNEG)
if (ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0))
if (ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1)) {
// fold floating point (fsub c1, c2)
- return DAG.getConstantFP(N0CFP->getValue() - N1CFP->getValue(),
- N->getValueType(0));
+ return DAG.getConstantFP(N0CFP->getValue() - N1CFP->getValue(), VT);
}
// fold (A-(-B)) -> A+B
if (N1.getOpcode() == ISD::FNEG)
SDOperand DAGCombiner::visitFMUL(SDNode *N) {
SDOperand N0 = N->getOperand(0);
SDOperand N1 = N->getOperand(1);
+ ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
+ ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT::ValueType VT = N->getValueType(0);
- if (ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0))
- if (ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1)) {
- // fold floating point (fmul c1, c2)
- return DAG.getConstantFP(N0CFP->getValue() * N1CFP->getValue(),
- N->getValueType(0));
- }
+ // fold (fmul c1, c2) -> c1*c2
+ if (N0CFP && N1CFP)
+ return DAG.getConstantFP(N0CFP->getValue() * N1CFP->getValue(), VT);
+ // canonicalize constant to RHS
+ if (N0CFP && !N1CFP) {
+ std::swap(N0, N1);
+ std::swap(N0CFP, N1CFP);
+ }
+ // fold (fmul X, 2.0) -> (fadd X, X)
+ if (N1CFP && N1CFP->isExactlyValue(+2.0))
+ return DAG.getNode(ISD::FADD, VT, N0, N0);
return SDOperand();
}
if (ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0))
if (ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1)) {
// fold floating point (fdiv c1, c2)
- return DAG.getConstantFP(N0CFP->getValue() / N1CFP->getValue(),
- N->getValueType(0));
+ return DAG.getConstantFP(N0CFP->getValue() / N1CFP->getValue(), VT);
}
return SDOperand();
}
if (ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0))
if (ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1)) {
// fold floating point (frem c1, c2) -> fmod(c1, c2)
- return DAG.getConstantFP(fmod(N0CFP->getValue(),N1CFP->getValue()),
- N->getValueType(0));
+ return DAG.getConstantFP(fmod(N0CFP->getValue(),N1CFP->getValue()), VT);
}
return SDOperand();
}