combine.c (subst): Also handle (subreg (const_double ...)) case if created by a substitution...

	* combine.c (subst): Also handle (subreg (const_double ...)) case
	if created by a substitution, by using the original inner mode.

From-SVN: r69476

gcc/ChangeLog

 2003-07-16  Roger Sayle  <roger@eyesopen.com>
 
+	* combine.c (subst): Also handle (subreg (const_double ...)) case
+	if created by a substitution, by using the original inner mode.
+
+2003-07-16  Roger Sayle  <roger@eyesopen.com>
+
 	* simplify-rtx.c (simplify_replace_rtx): Convert constant comparisons
 	to MODE_FLOAT constants if FLOAT_STORE_FLAG_VALUE is defined.
 	(simplify_rtx): Likewise.  Simplify (lo_sum (high X) X) as X.

gcc/combine.c

@@ -3476,7 +3476,9 @@ subst (rtx x, rtx from, rtx to, int in_dest, int unique_copy)
 	      if (GET_CODE (new) == CLOBBER && XEXP (new, 0) == const0_rtx)
 		return new;
 
-	      if (GET_CODE (new) == CONST_INT && GET_CODE (x) == SUBREG)
+	      if (GET_CODE (x) == SUBREG
+		  && (GET_CODE (new) == CONST_INT
+		      || GET_CODE (new) == CONST_DOUBLE))
 		{
 		  enum machine_mode mode = GET_MODE (x);