unroll.c (loop_iterations): Don't return a final value for EQ comparison loops.

	* unroll.c (loop_iterations): Don't return a final value for EQ
	comparison loops.

From-SVN: r25729

gcc/ChangeLog

+Fri Mar 12 20:45:30 1999  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+	* unroll.c (loop_iterations): Don't return a final value for EQ
+	comparison loops.
+
 Fri Mar 12 12:35:01 1999  Jim Wilson  <wilson@cygnus.com>
 
 	* reload1.c (calculate_needs_all_insns): When ignore equivalence

gcc/unroll.c

@@ -3820,6 +3820,12 @@ loop_iterations (loop_start, loop_end, loop_info)
   loop_info->initial_equiv_value = initial_value;
   loop_info->final_equiv_value = final_value;
 
+  /* For EQ comparison loops, we don't have a valid final value.
+     Check this now so that we won't leave an invalid value if we
+     return early for any other reason.  */
+  if (comparison_code == EQ)
+      loop_info->final_equiv_value = loop_info->final_value = 0;
+
   if (increment == 0)
     {
       if (loop_dump_stream)