unroll.c (find_splittable_givs): Don't split givs with a dest_reg that was created by loop.

        * unroll.c (find_splittable_givs): Don't split givs with a dest_reg
        that was created by loop.

From-SVN: r16803

gcc/ChangeLog

+Thu Nov 27 12:20:19 1997  Jeffrey A Law  (law@cygnus.com)
+
+	* unroll.c (find_splittable_givs): Don't split givs with a dest_reg
+	that was created by loop.
+
 Wed Nov 26 15:47:30 1997  Michael Meissner  <meissner@cygnus.com>
 
 	* rs6000.c (SMALL_DATA_REG): Register to use for small data relocs.

gcc/unroll.c

@@ -2668,6 +2668,12 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
     {
       rtx giv_inc, value;
 
+      
+      /* If this is a new register, can't handle it since it does not have
+	 an entry in reg_n_info.  */
+      if (REGNO (v->dest_reg) >= max_reg_before_loop)
+	continue;
+
       /* Only split the giv if it has already been reduced, or if the loop is
 	 being completely unrolled.  */
       if (unroll_type != UNROLL_COMPLETELY && v->ignore)