* integrate.c (mark_hard_reg_initial_vals): Check for NULL.

From-SVN: r43487

gcc/ChangeLog

 2001-06-21  DJ Delorie  <dj@redhat.com>
 
+	* integrate.c (mark_hard_reg_initial_vals): Check for NULL.
+	
 	* integrate.c (ggc.h): Include.
 	(initial_value_pair, initial_value_struct,
 	setup_initial_hard_reg_value_integration): Add prototypes.

gcc/integrate.c

@@ -2977,6 +2977,9 @@ mark_hard_reg_initial_vals (fun)
   struct initial_value_struct *ivs = fun->hard_reg_initial_vals;
   int i;
 
+  if (ivs == 0)
+    return;
+
   for (i = 0; i < ivs->num_entries; i ++)
     {
       ggc_mark_rtx (ivs->entries[i].hard_reg);