diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 7e8e46fba5..e4b24f1aaf 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3853,6 +3853,9 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) { // fold (fsub c1, c2) -> c1-c2 if (N0CFP && N1CFP && VT != MVT::ppcf128) return DAG.getNode(ISD::FSUB, VT, N0, N1); + // fold (A-0) -> A + if (UnsafeFPMath && N1CFP && N1CFP->getValueAPF().isZero()) + return N0; // fold (0-B) -> -B if (UnsafeFPMath && N0CFP && N0CFP->getValueAPF().isZero()) { if (isNegatibleForFree(N1, LegalOperations)) |