git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111394
91177308-0d34-0410-b5e6-
96231b3b80d8
NodeType *getPath(unsigned n) const {
return VisitStack[n].first.getPointer();
}
+
+ /// skipChildren - Skip all children of Node, assuming that Node is on the
+ /// current path. This allows more aggressive pruning than just skipping
+ /// children of the current node.
+ _Self& skipChildren(NodeType *Node) {
+ while (!VisitStack.empty() && **this != Node)
+ VisitStack.pop_back();
+ return skipChildren();
+ }
};
}
// No need to search the children, we found a dominating value.
- // FIXME: We could prune up to the last phi-def we inserted, need df_iterator
- // for that.
- IDFI.skipChildren();
+ // MBB is either the found dominating value, or the last phi-def we created.
+ // Either way, the children of MBB would be shadowed, so don't search them.
+ IDFI.skipChildren(MBB);
}
// The search should at least find a dominating value for IdxMBB.