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[DAGCombine] visitFDIV - Use isCheaperToUseNegatedFPOps helper for (fdiv (fneg X), (fneg Y)) -> (fdiv X, Y). NFCI. 

Minor cleanup to use equivalent helper code.

llvm-svn: 371724
This commit is contained in:
Simon Pilgrim 2019-09-12 11:03:09 +00:00
parent f2cb4a1842
commit da59a6bf7d
1 changed files with 5 additions and 15 deletions
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20
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -12687,21 +12687,11 @@ SDValue DAGCombiner::visitFDIV(SDNode *N) {
}
// (fdiv (fneg X), (fneg Y)) -> (fdiv X, Y)
if (char LHSNeg = isNegatibleForFree(N0, LegalOperations, TLI, &Options,
ForCodeSize)) {
if (char RHSNeg = isNegatibleForFree(N1, LegalOperations, TLI, &Options,
ForCodeSize)) {
// Both can be negated for free, check to see if at least one is cheaper
// negated.
if (LHSNeg == 2 || RHSNeg == 2)
return DAG.getNode(ISD::FDIV, SDLoc(N), VT,
GetNegatedExpression(N0, DAG, LegalOperations,
ForCodeSize),
GetNegatedExpression(N1, DAG, LegalOperations,
ForCodeSize),
Flags);
}
}
if (isCheaperToUseNegatedFPOps(N0, N1))
return DAG.getNode(
ISD::FDIV, SDLoc(N), VT,
GetNegatedExpression(N0, DAG, LegalOperations, ForCodeSize),
GetNegatedExpression(N1, DAG, LegalOperations, ForCodeSize), Flags);
return SDValue();
}