diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 46c4bb8..816b7ba 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -4046,6 +4046,8 @@ static SDValue foldSubCtlzNot(SDNode *N, SelectionDAG &DAG) { m_ConstInt(AndMask)))) { // Type Legalisation Pattern: // (sub (ctlz (and (xor Op XorMask) AndMask)) BitWidthDiff) + if (BitWidthDiff.getZExtValue() >= BitWidth) + return SDValue(); unsigned AndMaskWidth = BitWidth - BitWidthDiff.getZExtValue(); if (!(AndMask.isMask(AndMaskWidth) && XorMask.countr_one() >= AndMaskWidth)) return SDValue(); |