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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97212 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/DAGISelHeader.h b/include/llvm/CodeGen/DAGISelHeader.h
index 003caf1b9eb93cb8183ffbb72936dc1930ad4940..67b4155cf4bbf92bf87d8d49c672e833b48f5481 100644 (file)
--- a/include/llvm/CodeGen/DAGISelHeader.h
+++ b/include/llvm/CodeGen/DAGISelHeader.h
@@ -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