diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 290f2a1ea27..de715e4791e 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7181,11 +7181,16 @@ SDValue DAGCombiner::visitFNEG(SDNode *N) { // (fneg (fmul c, x)) -> (fmul -c, x) if (N0.getOpcode() == ISD::FMUL) { ConstantFPSDNode *CFP1 = dyn_cast<ConstantFPSDNode>(N0.getOperand(1)); - if (CFP1) - return DAG.getNode(ISD::FMUL, SDLoc(N), VT, - N0.getOperand(0), - DAG.getNode(ISD::FNEG, SDLoc(N), VT, - N0.getOperand(1))); + if (CFP1) { + APFloat CVal = CFP1->getValueAPF(); + CVal.changeSign(); + if (Level >= AfterLegalizeDAG && + (TLI.isFPImmLegal(CVal, N->getValueType(0)) || + TLI.isOperationLegal(ISD::ConstantFP, N->getValueType(0)))) + return DAG.getNode( + ISD::FMUL, SDLoc(N), VT, N0.getOperand(0), + DAG.getNode(ISD::FNEG, SDLoc(N), VT, N0.getOperand(1))); + } } return SDValue(); |
