diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
index 78b94a2..241f680 100644
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -910,6 +910,9 @@
       continue;
     }
 
+    if (MI.isDebugLabel())
+      continue;
+
     // If this is a copy, we may be able to coalesce.
     unsigned CopySrcReg = 0;
     unsigned CopyDstReg = 0;