expmed.c (store_bit_field): Try to simplify the subreg before generating a new one when...

2002-02-21  Eric Christopher  <echristo@redhat.com>

	* expmed.c (store_bit_field): Try to simplify the subreg
	before generating a new one when when the mode size of
	value is less than maxmode.

From-SVN: r49946

gcc/ChangeLog

+2002-02-21  Eric Christopher  <echristo@redhat.com>
+
+	* expmed.c (store_bit_field): Try to simplify the subreg
+	before generating a new one when when the mode size of
+	value is less than maxmode.
+
 2002-02-21  Richard Henderson  <rth@redhat.com>
 
 	* emit-rtl.c (offset_address): Use simplify_gen_binary rather

gcc/expmed.c

@@ -630,8 +630,17 @@ store_bit_field (str_rtx, bitsize, bitnum, fieldmode, value, total_size)
 		 if we must narrow it, be sure we do it correctly.  */
 
 	      if (GET_MODE_SIZE (GET_MODE (value)) < GET_MODE_SIZE (maxmode))
-		value1 = simplify_gen_subreg (maxmode, value1,
-					      GET_MODE (value1), 0);
+		{
+		  rtx tmp;
+
+		  tmp = simplify_subreg (maxmode, value1, GET_MODE (value), 0);
+		  if (! tmp)
+		    tmp = simplify_gen_subreg (maxmode,
+					       force_reg (GET_MODE (value),
+							  value1),
+					       GET_MODE (value), 0);
+		  value1 = tmp;
+		}
 	      else
 		value1 = gen_lowpart (maxmode, value1);
 	    }