diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 70 |
1 files changed, 46 insertions, 24 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index a7b411cecac..c2306a16d40 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -469,7 +469,8 @@ namespace { /// \return True if a merged store was created. bool MergeStoresOfConstantsOrVecElts(SmallVectorImpl<MemOpLink> &StoreNodes, EVT MemVT, unsigned NumStores, - bool IsConstantSrc, bool UseVector); + bool IsConstantSrc, bool UseVector, + bool UseTrunc); /// This is a helper function for MergeConsecutiveStores. /// Stores that may be merged are placed in StoreNodes. @@ -12378,8 +12379,8 @@ SDValue DAGCombiner::getMergeStoreChains(SmallVectorImpl<MemOpLink> &StoreNodes, } bool DAGCombiner::MergeStoresOfConstantsOrVecElts( - SmallVectorImpl<MemOpLink> &StoreNodes, EVT MemVT, - unsigned NumStores, bool IsConstantSrc, bool UseVector) { + SmallVectorImpl<MemOpLink> &StoreNodes, EVT MemVT, unsigned NumStores, + bool IsConstantSrc, bool UseVector, bool UseTrunc) { // Make sure we have something to merge. if (NumStores < 2) return false; @@ -12464,7 +12465,7 @@ bool DAGCombiner::MergeStoresOfConstantsOrVecElts( // make sure we use trunc store if it's necessary to be legal. SDValue NewStore; - if (TLI.isTypeLegal(StoredVal.getValueType())) { + if (UseVector || !UseTrunc) { NewStore = DAG.getStore(NewChain, DL, StoredVal, FirstInChain->getBasePtr(), FirstInChain->getPointerInfo(), FirstInChain->getAlignment()); @@ -12721,8 +12722,9 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { LSBaseSDNode *FirstInChain = StoreNodes[0].MemNode; unsigned FirstStoreAS = FirstInChain->getAddressSpace(); unsigned FirstStoreAlign = FirstInChain->getAlignment(); - unsigned LastLegalType = 0; - unsigned LastLegalVectorType = 0; + unsigned LastLegalType = 1; + unsigned LastLegalVectorType = 1; + bool LastIntegerTrunc = false; bool NonZero = false; for (unsigned i = 0; i < NumConsecutiveStores; ++i) { StoreSDNode *ST = cast<StoreSDNode>(StoreNodes[i].MemNode); @@ -12747,6 +12749,7 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { TLI.allowsMemoryAccess(Context, DL, StoreTy, FirstStoreAS, FirstStoreAlign, &IsFast) && IsFast) { + LastIntegerTrunc = false; LastLegalType = i + 1; // Or check whether a truncstore is legal. } else if (TLI.getTypeAction(Context, StoreTy) == @@ -12758,6 +12761,7 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { TLI.allowsMemoryAccess(Context, DL, LegalizedStoredValueTy, FirstStoreAS, FirstStoreAlign, &IsFast) && IsFast) { + LastIntegerTrunc = true; LastLegalType = i + 1; } } @@ -12787,8 +12791,8 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { bool UseVector = (LastLegalVectorType > LastLegalType) && !NoVectors; unsigned NumElem = (UseVector) ? LastLegalVectorType : LastLegalType; - bool Merged = MergeStoresOfConstantsOrVecElts(StoreNodes, MemVT, NumElem, - true, UseVector); + bool Merged = MergeStoresOfConstantsOrVecElts( + StoreNodes, MemVT, NumElem, true, UseVector, LastIntegerTrunc); if (!Merged) { StoreNodes.erase(StoreNodes.begin(), StoreNodes.begin() + NumElem); continue; @@ -12836,7 +12840,7 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { } bool Merged = MergeStoresOfConstantsOrVecElts( - StoreNodes, MemVT, NumStoresToMerge, false, true); + StoreNodes, MemVT, NumStoresToMerge, false, true, false); if (!Merged) { StoreNodes.erase(StoreNodes.begin(), StoreNodes.begin() + NumStoresToMerge); @@ -12919,10 +12923,11 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { // Scan the memory operations on the chain and find the first // non-consecutive load memory address. These variables hold the index in // the store node array. - unsigned LastConsecutiveLoad = 0; + unsigned LastConsecutiveLoad = 1; // This variable refers to the size and not index in the array. - unsigned LastLegalVectorType = 0; - unsigned LastLegalIntegerType = 0; + unsigned LastLegalVectorType = 1; + unsigned LastLegalIntegerType = 1; + bool DoIntegerTruncate = false; StartAddress = LoadNodes[0].OffsetFromBase; SDValue FirstChain = FirstLoad->getChain(); for (unsigned i = 1; i < LoadNodes.size(); ++i) { @@ -12958,11 +12963,12 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { IsFastSt && TLI.allowsMemoryAccess(Context, DL, StoreTy, FirstLoadAS, FirstLoadAlign, &IsFastLd) && - IsFastLd) + IsFastLd) { LastLegalIntegerType = i + 1; - // Or check whether a truncstore and extload is legal. - else if (TLI.getTypeAction(Context, StoreTy) == - TargetLowering::TypePromoteInteger) { + DoIntegerTruncate = false; + // Or check whether a truncstore and extload is legal. + } else if (TLI.getTypeAction(Context, StoreTy) == + TargetLowering::TypePromoteInteger) { EVT LegalizedStoredValueTy = TLI.getTypeToTransformTo(Context, StoreTy); if (TLI.isTruncStoreLegal(LegalizedStoredValueTy, StoreTy) && TLI.canMergeStoresTo(FirstStoreAS, LegalizedStoredValueTy) && @@ -12976,8 +12982,10 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) { IsFastSt && TLI.allowsMemoryAccess(Context, DL, StoreTy, FirstLoadAS, FirstLoadAlign, &IsFastLd) && - IsFastLd) + IsFastLd) { LastLegalIntegerType = i + 1; + DoIntegerTruncate = true; + } } } @@ -13012,17 +13020,31 @@ 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 (UseVectorTy || !DoIntegerTruncate) { + 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) { |
