unroll.c (verify_addresses): Use validate_replace_rtx to undo the changes.

* unroll.c (verify_addresses): Use validate_replace_rtx to undo the
changes.  Abort if the undo fails.

From-SVN: r20404

gcc/ChangeLog

+Wed Jun 10 09:47:13 1998  Richard Earnshaw (rearnsha@arm.com)
+
+	* unroll.c (verify_addresses): Use validate_replace_rtx to undo the 
+	changes.  Abort if the undo fails.
+
 Wed Jun 10 08:56:27 1998  John Carr  <jfc@mit.edu>
 
 	* reload1.c (reload_cse_simplify_operands): Do not call gen_rtx_REG

gcc/unroll.c

@@ -2664,9 +2664,10 @@ verify_addresses (v, giv_inc, unroll_number)
       || ! validate_replace_rtx (*v->location, last_addr, v->insn))
     ret = 0;
 
-  /* Now put things back the way they were before.  This will always
+  /* Now put things back the way they were before.  This should always
    succeed.  */
-  validate_change (v->insn, v->location, orig_addr, 0);
+  if (! validate_replace_rtx (*v->location, orig_addr, v->insn))
+    abort ();
 
   return ret;
 }