diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index ac324fe4c3d..33821c33bb7 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -704,8 +704,8 @@ static char isNegatibleForFree(SDValue Op, bool LegalOperations, TLI.isFPImmLegal(neg(cast<ConstantFPSDNode>(Op)->getValueAPF()), VT); } case ISD::FADD: - // FIXME: determine better conditions for this xform. - if (!Options->UnsafeFPMath) return 0; + if (!Options->UnsafeFPMath && !Flags.hasNoSignedZeros()) + return 0; // After operation legalization, it might not be legal to create new FSUBs. if (LegalOperations && !TLI.isOperationLegalOrCustom(ISD::FSUB, VT)) @@ -766,8 +766,7 @@ static SDValue GetNegatedExpression(SDValue Op, SelectionDAG &DAG, return DAG.getConstantFP(V, SDLoc(Op), Op.getValueType()); } case ISD::FADD: - // FIXME: determine better conditions for this xform. - assert(Options.UnsafeFPMath); + assert(Options.UnsafeFPMath || Flags.hasNoSignedZeros()); // fold (fneg (fadd A, B)) -> (fsub (fneg A), B) if (isNegatibleForFree(Op.getOperand(0), LegalOperations, |
