diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4871476cc72..528ca321a56 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-03-06  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR debug/42897
+	* tree-vect-loop.c (vect_transform_loop): Kill out-of-loop debug
+	uses of relevant DEFs that are dead outside the loop too.
+
 2010-03-06  Alexandre Oliva <aoliva@redhat.com>
 
 	* var-tracking.c (dataflow_set_merge): Swap src and src2.
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index 16aa242e7fe..afbd342fd1c 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -4236,13 +4236,12 @@ vect_transform_loop (loop_vec_info loop_vinfo)
 	  if (!stmt_info)
 	    continue;
 
+	  if (MAY_HAVE_DEBUG_STMTS && !STMT_VINFO_LIVE_P (stmt_info))
+	    vect_loop_kill_debug_uses (loop, phi);
+
 	  if (!STMT_VINFO_RELEVANT_P (stmt_info)
 	      && !STMT_VINFO_LIVE_P (stmt_info))
-	    {
-	      if (MAY_HAVE_DEBUG_STMTS)
-		vect_loop_kill_debug_uses (loop, phi);
-	      continue;
-	    }
+	    continue;
 
 	  if ((TYPE_VECTOR_SUBPARTS (STMT_VINFO_VECTYPE (stmt_info))
 	        != (unsigned HOST_WIDE_INT) vectorization_factor)
@@ -4279,11 +4278,12 @@ vect_transform_loop (loop_vec_info loop_vinfo)
 	      continue;
 	    }
 
+	  if (MAY_HAVE_DEBUG_STMTS && !STMT_VINFO_LIVE_P (stmt_info))
+	    vect_loop_kill_debug_uses (loop, stmt);
+
 	  if (!STMT_VINFO_RELEVANT_P (stmt_info)
 	      && !STMT_VINFO_LIVE_P (stmt_info))
 	    {
-	      if (MAY_HAVE_DEBUG_STMTS)
-		vect_loop_kill_debug_uses (loop, stmt);
 	      gsi_next (&si);
 	      continue;
 	    }