diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 747aa43df26..857109119fb 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -11770,8 +11770,9 @@ SDValue DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) { // shuffle(shuffle(A, B, M0), C, M1) -> shuffle(A, C, M2) // shuffle(shuffle(A, B, M0), C, M1) -> shuffle(B, C, M2) // Don't try to fold shuffles with illegal type. - if (N0.getOpcode() == ISD::VECTOR_SHUFFLE && Level < AfterLegalizeDAG && - TLI.isTypeLegal(VT)) { + // Only fold if this shuffle is the only user of the other shuffle. + if (N0.getOpcode() == ISD::VECTOR_SHUFFLE && N->isOnlyUserOf(N0.getNode()) && + Level < AfterLegalizeDAG && TLI.isTypeLegal(VT)) { ShuffleVectorSDNode *OtherSV = cast<ShuffleVectorSDNode>(N0); // The incoming shuffle must be of the same type as the result of the |
