diff options
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index ac0d0884d7c..7c73212c294 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -14737,10 +14737,15 @@ ShrinkLoadReplaceStoreWithStore(const std::pair<unsigned, unsigned> &MaskInfo, // Check that it is legal on the target to do this. It is legal if the new // VT we're shrinking to (i8/i16/i32) is legal or we're still before type - // legalization. - MVT VT = MVT::getIntegerVT(NumBytes*8); + // legalization (and the target doesn't explicitly think this is a bad idea). + MVT VT = MVT::getIntegerVT(NumBytes * 8); + const TargetLowering &TLI = DAG.getTargetLoweringInfo(); if (!DC->isTypeLegal(VT)) return SDValue(); + if (St->getMemOperand() && + !TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), VT, + *St->getMemOperand())) + return SDValue(); // Okay, we can do this! Replace the 'St' store with a store of IVal that is // shifted by ByteShift and truncated down to NumBytes. |
