diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 7ec5fac390b..f2779a3475e 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -10794,17 +10794,18 @@ SDValue DAGCombiner::visitFMULForFMADistributiveCombine(SDNode *N) { unsigned PreferredFusedOpcode = HasFMAD ? ISD::FMAD : ISD::FMA; bool Aggressive = TLI.enableAggressiveFMAFusion(VT); - // fold (fmul (fadd x, +1.0), y) -> (fma x, y, y) - // fold (fmul (fadd x, -1.0), y) -> (fma x, y, (fneg y)) + // fold (fmul (fadd x0, +1.0), y) -> (fma x0, y, y) + // fold (fmul (fadd x0, -1.0), y) -> (fma x0, y, (fneg y)) auto FuseFADD = [&](SDValue X, SDValue Y, const SDNodeFlags Flags) { if (X.getOpcode() == ISD::FADD && (Aggressive || X->hasOneUse())) { - auto XC1 = isConstOrConstSplatFP(X.getOperand(1)); - if (XC1 && XC1->isExactlyValue(+1.0)) - return DAG.getNode(PreferredFusedOpcode, SL, VT, X.getOperand(0), Y, - Y, Flags); - if (XC1 && XC1->isExactlyValue(-1.0)) - return DAG.getNode(PreferredFusedOpcode, SL, VT, X.getOperand(0), Y, - DAG.getNode(ISD::FNEG, SL, VT, Y), Flags); + if (auto *C = isConstOrConstSplatFP(X.getOperand(1), true)) { + if (C->isExactlyValue(+1.0)) + return DAG.getNode(PreferredFusedOpcode, SL, VT, X.getOperand(0), Y, + Y, Flags); + if (C->isExactlyValue(-1.0)) + return DAG.getNode(PreferredFusedOpcode, SL, VT, X.getOperand(0), Y, + DAG.getNode(ISD::FNEG, SL, VT, Y), Flags); + } } return SDValue(); }; |
