diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dd1b4b49581..dfea1b6c038 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+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>
 
diff --git a/gcc/sched-vis.c b/gcc/sched-vis.c
index 280b33ad2f5..d4f5e95782d 100644
--- a/gcc/sched-vis.c
+++ b/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: