diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 4c2135e665d..b228f1e3cbb 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2463,6 +2463,9 @@ SDValue DAGCombiner::visitSDIV(SDNode *N) { // X / undef -> undef if (N1.isUndef()) return N1; + // X / 0 --> undef (we don't need to preserve faults!) + if (N1C && N1C->isNullValue()) + return DAG.getUNDEF(VT); return SDValue(); } @@ -2538,6 +2541,9 @@ SDValue DAGCombiner::visitUDIV(SDNode *N) { // X / undef -> undef if (N1.isUndef()) return N1; + // X / 0 --> undef (we don't need to preserve faults!) + if (N1C && N1C->isNullValue()) + return DAG.getUNDEF(VT); return SDValue(); } @@ -2618,7 +2624,10 @@ SDValue DAGCombiner::visitREM(SDNode *N) { // X % undef -> undef if (N1.isUndef()) return N1; - + // X % 0 --> undef (we don't need to preserve faults!) + if (N1C && N1C->isNullValue()) + return DAG.getUNDEF(VT); + return SDValue(); } |
