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fix the matcher in the presence of multiple scopes: we need to save

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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
This commit is contained in:
Chris Lattner 2010-02-26 07:28:20 +00:00
parent 7caf38490a
commit 01f5df01bf
1 changed files with 5 additions and 4 deletions
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9
include/llvm/CodeGen/DAGISelHeader.h
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@ -283,8 +283,8 @@ struct MatchScope {
/// FailIndex - If this match fails, this is the index to continue with.
unsigned FailIndex;
/// NodeStackSize - The size of the node stack when the scope was formed.
unsigned NodeStackSize;
/// NodeStack - The node stack when the scope was formed.
SmallVector<SDValue, 4> NodeStack;
/// NumRecordedNodes - The number of recorded nodes when the scope was formed.
unsigned NumRecordedNodes;
@ -383,7 +383,7 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
// to match.
MatchScope NewEntry;
NewEntry.FailIndex = MatcherIndex+NumToSkip;
NewEntry.NodeStackSize = NodeStack.size();
NewEntry.NodeStack.append(NodeStack.begin(), NodeStack.end());
NewEntry.NumRecordedNodes = RecordedNodes.size();
NewEntry.NumMatchedMemRefs = MatchedMemRefs.size();
NewEntry.InputChain = InputChain;
@ -935,7 +935,8 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
// formed.
MatchScope &LastScope = MatchScopes.back();
RecordedNodes.resize(LastScope.NumRecordedNodes);
NodeStack.resize(LastScope.NodeStackSize);
NodeStack.clear();
NodeStack.append(LastScope.NodeStack.begin(), LastScope.NodeStack.end());
N = NodeStack.back();
DEBUG(errs() << " Match failed at index " << MatcherIndex