Aggressively prune the DFS when inserting phi-defs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111394 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index b081bf3..dae282d 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -446,9 +446,9 @@
}
// 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.