If the type legalizer actually legalized anything

(this doesn't happen that often, since most code
does not use illegal types) then follow it by a
DAG combiner run that is allowed to generate
illegal operations but not illegal types.  I didn't
modify the target combiner code to distinguish like
this between illegal operations and illegal types,
so it will not produce illegal operations as well
as not producing illegal types.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59960 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.h b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
index f75fa778ed..6d41cc5110 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -160,7 +160,10 @@ public:
            "Too many value types for ValueTypeActions to hold!");
   }
 
-  void run();
+  /// run - This is the main entry point for the type legalizer.  This does a
+  /// top-down traversal of the dag, legalizing types as it goes.  Returns
+  /// "true" if it made any changes.
+  bool run();
 
   /// ReanalyzeNode - Recompute the NodeId and correct processed operands
   /// for the specified node, adding it to the worklist if ready.