reload.c (find_reloads_toplev): Use gen_lowpart common to convert between…

reload.c (find_reloads_toplev): Use gen_lowpart common to convert between constant representations when...

        * reload.c (find_reloads_toplev): Use gen_lowpart common to convert
        between constant representations when we have (SUBREG (REG)) with
        REG equivalent to a constant.

From-SVN: r20398

gcc/ChangeLog

+Wed Jun 10 02:11:55 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* reload.c (find_reloads_toplev): Use gen_lowpart common to convert
+	between constant representations when we have (SUBREG (REG)) with
+	REG equivalent to a constant.
+
 Wed Jun 10 01:39:00 1998  Juha Sarlin <juha@c3l.tyreso.se> 
 
 	* h8300.c (get_shift_alg): Add special cases for shifts of 8 and 24.

gcc/reload.c

@@ -4289,7 +4289,18 @@ find_reloads_toplev (x, opnum, type, ind_levels, is_set_dest)
 	  && (tem = operand_subword (reg_equiv_constant[regno],
 				     SUBREG_WORD (x), 0,
 				     GET_MODE (SUBREG_REG (x)))) != 0)
-	return tem;
+	{
+	  /* TEM is now a word sized constant for the bits from X that
+	     we wanted.  However, TEM may be the wrong representation.
+
+	     Use gen_lowpart_common to convert a CONST_INT into a
+	     CONST_DOUBLE and vice versa as needed according to by the mode
+	     of the SUBREG.  */
+	  tem = gen_lowpart_common (GET_MODE (x), tem);
+	  if (!tem)
+	    abort ();
+	  return tem;
+	}
 
       /* If the SUBREG is wider than a word, the above test will fail.
 	 For example, we might have a SImode SUBREG of a DImode SUBREG_REG