1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/RegAllocBase.h b/lib/CodeGen/RegAllocBase.h
index f431d5a5a0..b25ea23f85 100644
--- a/lib/CodeGen/RegAllocBase.h
+++ b/lib/CodeGen/RegAllocBase.h
@@ -113,6 +113,10 @@ protected:
     return Queries[PhysReg];
   }
 
+  // Invalidate all cached information about virtual registers - live ranges may
+  // have changed.
+  void invalidateVirtRegs() { ++UserTag; }
+
   // The top-level driver. The output is a VirtRegMap that us updated with
   // physical register assignments.
   //