regclass.c (record_operand_costs): Protect reg_changes_size with CLASS_CANNOT_CHANGE_SIZE.

        * regclass.c (record_operand_costs): Protect reg_changes_size
        with CLASS_CANNOT_CHANGE_SIZE.

From-SVN: r34238

gcc/ChangeLog

 2000-05-28  Richard Henderson  <rth@cygnus.com>
 
+	* regclass.c (record_operand_costs): Protect reg_changes_size
+	with CLASS_CANNOT_CHANGE_SIZE.
+
 	* loop.c (instrument_loop_bct): Set JUMP_LABEL on the new insn.
 
 2000-05-28  Richard Henderson  <rth@cygnus.com>

gcc/regclass.c

@@ -859,9 +859,11 @@ record_operand_costs (insn, op_costs, reg_pref)
       if (GET_CODE (recog_data.operand[i]) == SUBREG)
 	{
 	  rtx inner = SUBREG_REG (recog_data.operand[i]);
+#ifdef CLASS_CANNOT_CHANGE_SIZE
 	  if (GET_MODE_SIZE (modes[i]) != GET_MODE_SIZE (GET_MODE (inner))
 	      && GET_CODE (inner) == REG)
 	    SET_REGNO_REG_SET (reg_changes_size, REGNO (inner));
+#endif
 	  recog_data.operand[i] = inner;
 	}