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DAGCombiner: Merge store/loads when we have extload/truncstores

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This is helps on architectures where i8,i16 are not legal but we have byte, and
short loads/stores. Allowing us to merge copies like the one below on ARM.

copy(char *a, char *b, int n) {
 do {
   int t0 = a[0];
   int t1 = a[1];
   b[0] = t0;
   b[1] = t1;

radar://13536387

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-04-02 15:58:51 +00:00
parent e97f84e991
commit e737018a86
2 changed files with 117 additions and 0 deletions
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lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+19
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@@ -7980,6 +7980,14 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode* St) {
EVT StoreTy = EVT::getIntegerVT(*DAG.getContext(), StoreBW);
if (TLI.isTypeLegal(StoreTy))
LastLegalType = i+1;
// Or check whether a truncstore is legal.
else if (TLI.getTypeAction(*DAG.getContext(), StoreTy) ==
TargetLowering::TypePromoteInteger) {
EVT LegalizedStoredValueTy =
TLI.getTypeToTransformTo(*DAG.getContext(), StoredVal.getValueType());
if (TLI.isTruncStoreLegal(LegalizedStoredValueTy, StoreTy))
LastLegalType = i+1;
}
// Find a legal type for the vector store.
EVT Ty = EVT::getVectorVT(*DAG.getContext(), MemVT, i+1);
@@ -8163,6 +8171,17 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode* St) {
StoreTy = EVT::getIntegerVT(*DAG.getContext(), StoreBW);
if (TLI.isTypeLegal(StoreTy))
LastLegalIntegerType = i + 1;
// Or check whether a truncstore and extload is legal.
else if (TLI.getTypeAction(*DAG.getContext(), StoreTy) ==
TargetLowering::TypePromoteInteger) {
EVT LegalizedStoredValueTy =
TLI.getTypeToTransformTo(*DAG.getContext(), StoreTy);
if (TLI.isTruncStoreLegal(LegalizedStoredValueTy, StoreTy) &&
TLI.isLoadExtLegal(ISD::ZEXTLOAD, StoreTy) &&
TLI.isLoadExtLegal(ISD::SEXTLOAD, StoreTy) &&
TLI.isLoadExtLegal(ISD::EXTLOAD, StoreTy))
LastLegalIntegerType = i+1;
}
}
// Only use vector types if the vector type is larger than the integer type.