forked from OSchip/llvm-project
fix the matcher in the presence of multiple scopes: we need to save
and restore the entire matcher stack by value. This is because children we're testing could do moveparent or other things besides just scribbling on additions to the stack. llvm-svn: 97212
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@ -283,8 +283,8 @@ struct MatchScope {
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/// FailIndex - If this match fails, this is the index to continue with.
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unsigned FailIndex;
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/// NodeStackSize - The size of the node stack when the scope was formed.
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unsigned NodeStackSize;
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/// NodeStack - The node stack when the scope was formed.
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SmallVector<SDValue, 4> NodeStack;
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/// NumRecordedNodes - The number of recorded nodes when the scope was formed.
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unsigned NumRecordedNodes;
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@ -383,7 +383,7 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
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// to match.
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MatchScope NewEntry;
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NewEntry.FailIndex = MatcherIndex+NumToSkip;
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NewEntry.NodeStackSize = NodeStack.size();
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NewEntry.NodeStack.append(NodeStack.begin(), NodeStack.end());
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NewEntry.NumRecordedNodes = RecordedNodes.size();
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NewEntry.NumMatchedMemRefs = MatchedMemRefs.size();
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NewEntry.InputChain = InputChain;
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@ -935,7 +935,8 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
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// formed.
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MatchScope &LastScope = MatchScopes.back();
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RecordedNodes.resize(LastScope.NumRecordedNodes);
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NodeStack.resize(LastScope.NodeStackSize);
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NodeStack.clear();
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NodeStack.append(LastScope.NodeStack.begin(), LastScope.NodeStack.end());
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N = NodeStack.back();
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DEBUG(errs() << " Match failed at index " << MatcherIndex
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