diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index dc59006fcf..28f32d3d3b 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2888,7 +2888,8 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) { } // fold (sext x) -> (zext x) if the sign bit is known zero. - if (DAG.SignBitIsZero(N0)) + if ((!AfterLegalize || TLI.isOperationLegal(ISD::ZERO_EXTEND, VT)) && + DAG.SignBitIsZero(N0)) return DAG.getNode(ISD::ZERO_EXTEND, VT, N0); return SDOperand(); |