recog.c (validate_replace_rtx_1): Use "TO" mode if not VOIDmode when calling simplify_subreg.

	* recog.c (validate_replace_rtx_1): Use "TO" mode if not VOIDmode
	when calling simplify_subreg.  This is needed to allow replacing
	of expression of one mode by expression of different mode.

From-SVN: r42214

gcc/ChangeLog

+Thu May 17 19:48:00 CEST 2001  Jan Hubicka  <jh@suse.cz>
+
+	* recog.c (validate_replace_rtx_1): Use "TO" mode if not VOIDmode
+	when calling simplify_subreg.  This is needed to allow replacing
+	of expression of one mode by expression of different mode.
+
 Thu May 17 19:40:03 CEST 2001  Jan Hubicka  <jh@suse.cz>
 
 	* simplify-rtx.c  (simplify_subreg): Avoid creating of incorrect subregs.

gcc/recog.c

@@ -582,7 +582,9 @@ validate_replace_rtx_1 (loc, from, to, object)
       if (rtx_equal_p (SUBREG_REG (x), from))
         {
 	  rtx temp;
-	  temp = simplify_subreg (GET_MODE (x), to, GET_MODE (SUBREG_REG (x)),
+	  temp = simplify_subreg (GET_MODE (x), to,
+			 	  GET_MODE (to) != VOIDmode
+				  ? GET_MODE (to) : GET_MODE (SUBREG_REG (x)),
 				  SUBREG_BYTE (x));
 	  if (temp)
 	    {