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Differential D47954 Diff 151556 llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

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llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

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Show First 20 Lines • Show All 10,859 Lines • ▼ Show 20 LinesSDValue DAGCombiner::visitFDIV(SDNode *N) {
// fold (fdiv c1, c2) -> c1/c2 // fold (fdiv c1, c2) -> c1/c2
if (N0CFP && N1CFP) if (N0CFP && N1CFP)
return DAG.getNode(ISD::FDIV, SDLoc(N), VT, N0, N1, Flags); return DAG.getNode(ISD::FDIV, SDLoc(N), VT, N0, N1, Flags);
if (SDValue NewSel = foldBinOpIntoSelect(N)) if (SDValue NewSel = foldBinOpIntoSelect(N))
return NewSel; return NewSel;
if (Options.UnsafeFPMath) { if (Options.UnsafeFPMath || Flags.hasAllowReciprocal()) {
// fold (fdiv X, c2) -> fmul X, 1/c2 if losing precision is acceptable. // fold (fdiv X, c2) -> fmul X, 1/c2 if losing precision is acceptable.
if (N1CFP) { if (N1CFP) {
// Compute the reciprocal 1.0 / c2. // Compute the reciprocal 1.0 / c2.
const APFloat &N1APF = N1CFP->getValueAPF(); const APFloat &N1APF = N1CFP->getValueAPF();
APFloat Recip(N1APF.getSemantics(), 1); // 1.0 APFloat Recip(N1APF.getSemantics(), 1); // 1.0
APFloat::opStatus st = Recip.divide(N1APF, APFloat::rmNearestTiesToEven); APFloat::opStatus st = Recip.divide(N1APF, APFloat::rmNearestTiesToEven);
// Only do the transform if the reciprocal is a legal fp immediate that // Only do the transform if the reciprocal is a legal fp immediate that
// isn't too nasty (eg NaN, denormal, ...). // isn't too nasty (eg NaN, denormal, ...).
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