* loop.c (strength_reduce): Re-enable Joern's loop improvements.

From-SVN: r26299

gcc/ChangeLog

+Thu Apr  8 19:20:18 1999  Jeffrey A Law  (law@cygnus.com)
+
+	* loop.c (strength_reduce): Re-enable Joern's loop improvements.
+
 Thu Apr  8 09:37:40 1999  Nick Clifton  <nickc@cygnus.com>
 
 	* config/arm/arm.c (arm_print_operand): Undo previous change -

gcc/loop.c

@@ -4118,8 +4118,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
 
   /* If the loop contains volatile memory references do not allow any
      replacements to take place, since this could loose the volatile markers.  */
-  /* XXX Temporary.  */
-  if (0 && n_extra_increment  && ! loop_has_volatile)
+  if (n_extra_increment  && ! loop_has_volatile)
     {
       int nregs = first_increment_giv + n_extra_increment;
 
@@ -4704,8 +4703,6 @@ strength_reduce (scan_start, end, loop_top, insn_count,
 	    }
 	}
 
-#if 0
-      /* XXX Temporary.  */
       /* Now that we know which givs will be reduced, try to rearrange the
          combinations to reduce register pressure.
          recombine_givs calls find_life_end, which needs reg_iv_type and
@@ -4724,7 +4721,6 @@ strength_reduce (scan_start, end, loop_top, insn_count,
 	  VARRAY_GROW (reg_iv_info, nregs);
 	}
       recombine_givs (bl, loop_start, loop_end, unroll_p);
-#endif
 
       /* Reduce each giv that we decided to reduce.  */