diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index c2b7f6c513..753ba937c0 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -5670,9 +5670,13 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) { GetNegatedExpression(N1, DAG, LegalOperations)); // If 'unsafe math' is enabled, fold + // (fsub x, x) -> 0.0 & // (fsub x, (fadd x, y)) -> (fneg y) & // (fsub x, (fadd y, x)) -> (fneg y) if (DAG.getTarget().Options.UnsafeFPMath) { + if (N0 == N1) + return DAG.getConstantFP(0.0f, VT); + if (N1.getOpcode() == ISD::FADD) { SDValue N10 = N1->getOperand(0); SDValue N11 = N1->getOperand(1); |