diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index bcec40e4f29..b5e1b492e96 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -12461,10 +12461,27 @@ bool DAGCombiner::MergeStoresOfConstantsOrVecElts( LSBaseSDNode *FirstInChain = StoreNodes[0].MemNode; SDValue NewChain = getMergeStoreChains(StoreNodes, NumStores); - SDValue NewStore = DAG.getStore(NewChain, DL, StoredVal, - FirstInChain->getBasePtr(), - FirstInChain->getPointerInfo(), - FirstInChain->getAlignment()); + + // make sure we use trunc store if it's necessary to be legal. + SDValue NewStore; + if (TLI.isTypeLegal(StoredVal.getValueType())) { + NewStore = DAG.getStore(NewChain, DL, StoredVal, FirstInChain->getBasePtr(), + FirstInChain->getPointerInfo(), + FirstInChain->getAlignment()); + } else { // Must be realized as a trunc store + EVT LegalizedStoredValueTy = + TLI.getTypeToTransformTo(*DAG.getContext(), StoredVal.getValueType()); + unsigned LegalizedStoreSize = LegalizedStoredValueTy.getSizeInBits(); + ConstantSDNode *C = cast<ConstantSDNode>(StoredVal); + SDValue ExtendedStoreVal = + DAG.getConstant(C->getAPIntValue().zextOrTrunc(LegalizedStoreSize), DL, + LegalizedStoredValueTy); + NewStore = DAG.getTruncStore( + NewChain, DL, ExtendedStoreVal, FirstInChain->getBasePtr(), + FirstInChain->getPointerInfo(), StoredVal.getValueType() /*TVT*/, + FirstInChain->getAlignment(), + FirstInChain->getMemOperand()->getFlags()); + } // Replace all merged stores with the new store. for (unsigned i = 0; i < NumStores; ++i) |
