remove.c (optimize_reg_copy_3): Abort instead of silently generating bogus rtl.

        * remove.c (optimize_reg_copy_3): Abort instead of silently generating
        bogus rtl.

From-SVN: r21887

gcc/ChangeLog

 Thu Aug 20 19:43:44 1998  Jeffrey A Law  (law@cygnus.com)
 
+	* remove.c (optimize_reg_copy_3): Abort instead of silently generating
+	bogus rtl.
+
 	* jump.c (rtx_renumbered_equal_p): Do not consider PLUS commutative.
 
 Thu Aug 20 17:35:20 1998  David S. Miller  <davem@pierdol.cobaltmicro.com>

gcc/regmove.c

@@ -560,7 +560,10 @@ optimize_reg_copy_3 (insn, dest, src)
     {
       if (GET_RTX_CLASS (GET_CODE (p)) != 'i')
 	continue;
-      validate_replace_rtx (src_reg, subreg, p);
+      /* If we can not perform the replacement, then abort now
+	 to make debugging easier.  */
+      if (! validate_replace_rtx (src_reg, subreg, p))
+	abort ();
     }
   validate_replace_rtx (src, src_reg, insn);
 }