Fix register renaming problem

From-SVN: r40152

gcc/ChangeLog

 2001-03-01  Bernd Schmidt  <bernds@redhat.com>
 
+	* config/ia64/ia64.c (ia64_hard_regno_rename_ok): Disallow renaming
+	from reg 4 if current_function_calls_setjmp.
+
 	* reload1.c (eliminate_regs_in_insn): Restrict the special case
 	code not to try to optimize adds with anything but a REG destination.
 

gcc/config/ia64/ia64.c

@@ -2436,6 +2436,10 @@ ia64_hard_regno_rename_ok (from, to)
   if (PR_REGNO_P (from) && PR_REGNO_P (to))
     return (from & 1) == (to & 1);
 
+  /* Reg 4 contains the saved gp; we can't reliably rename this.  */
+  if (from == GR_REG (4) && current_function_calls_setjmp)
+    return 0;
+
   return 1;
 }