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[DAG] Allow truncated and extend memory operations in Store Merge. NFCI.

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As all store merges checks are based on the memory operation
performed, allow use of truncated stores and extended loads as valid
input candidates for merging.

llvm-svn: 305468
This commit is contained in:
Nirav Dave 2017-06-15 14:04:07 +00:00
parent 1cb883a45b
commit 101d566fcb
1 changed files with 21 additions and 10 deletions
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31
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -12874,9 +12874,6 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) {
if (Ld->isVolatile() || Ld->isIndexed())
break;
// We do not accept ext loads.
if (Ld->getExtensionType() != ISD::NON_EXTLOAD)
break;
// The stored memory type must be the same.
if (Ld->getMemoryVT() != MemVT)
@ -13014,17 +13011,31 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) {
// The merged loads are required to have the same incoming chain, so
// using the first's chain is acceptable.
SDValue NewLoad = DAG.getLoad(JointMemOpVT, LoadDL, FirstLoad->getChain(),
FirstLoad->getBasePtr(),
FirstLoad->getPointerInfo(), FirstLoadAlign);
SDValue NewStoreChain = getMergeStoreChains(StoreNodes, NumElem);
AddToWorklist(NewStoreChain.getNode());
SDValue NewStore = DAG.getStore(
NewStoreChain, StoreDL, NewLoad, FirstInChain->getBasePtr(),
FirstInChain->getPointerInfo(), FirstStoreAlign);
SDValue NewLoad, NewStore;
if (TLI.isTypeLegal(JointMemOpVT)) {
NewLoad = DAG.getLoad(JointMemOpVT, LoadDL, FirstLoad->getChain(),
FirstLoad->getBasePtr(),
FirstLoad->getPointerInfo(), FirstLoadAlign);
NewStore = DAG.getStore(NewStoreChain, StoreDL, NewLoad,
FirstInChain->getBasePtr(),
FirstInChain->getPointerInfo(), FirstStoreAlign);
} else { // This must be the truncstore/extload case
EVT ExtendedTy =
TLI.getTypeToTransformTo(*DAG.getContext(), JointMemOpVT);
NewLoad = DAG.getExtLoad(ISD::EXTLOAD, LoadDL, ExtendedTy,
FirstLoad->getChain(), FirstLoad->getBasePtr(),
FirstLoad->getPointerInfo(), JointMemOpVT,
FirstLoadAlign);
NewStore = DAG.getTruncStore(NewStoreChain, StoreDL, NewLoad,
FirstInChain->getBasePtr(),
FirstInChain->getPointerInfo(), JointMemOpVT,
FirstInChain->getAlignment(),
FirstInChain->getMemOperand()->getFlags());
}
// Transfer chain users from old loads to the new load.
for (unsigned i = 0; i < NumElem; ++i) {