sched-vis.c (print_pattern): Handle NULL patterns.

	* sched-vis.c (print_pattern): Handle NULL patterns.

From-SVN: r193455

gcc/ChangeLog

 2012-11-12  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* sched-vis.c (print_pattern): Handle NULL patterns.
+
+2012-11-12  Steven Bosscher  <steven@gcc.gnu.org>
 	    Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/51447

gcc/sched-vis.c

@@ -568,6 +568,12 @@ print_pattern (char *buf, const_rtx x, int verbose)
 {
   char t1[BUF_LEN], t2[BUF_LEN], t3[BUF_LEN];
 
+  if (! x)
+    {
+      sprintf (buf, "(nil)");
+      return;
+    }
+
   switch (GET_CODE (x))
     {
     case SET: