rtlanal.c (rtx_cost): Assign cost of 0 to a SUBREG when modes are tieable.

2005-01-17  Mark Dettinger  <dettinge@de.ibm.com>

	* rtlanal.c (rtx_cost): Assign cost of 0 to a SUBREG
	when modes are tieable.

From-SVN: r93763

gcc/ChangeLog

+2005-01-17  Mark Dettinger  <dettinge@de.ibm.com>
+
+	* rtlanal.c (rtx_cost): Assign cost of 0 to a SUBREG
+	when modes are tieable.
+
 2005-01-17  Ranjit Mathew  <rmathew@hotmail.com>
 
 	* gthr-posix.h (__gthread_active_p): Use pthread_cancel instead

gcc/rtlanal.c

@@ -3270,6 +3270,7 @@ rtx_cost (rtx x, enum rtx_code outer_code ATTRIBUTE_UNUSED)
       return 0;
 
     case SUBREG:
+      total = 0;
       /* If we can't tie these modes, make this expensive.  The larger
 	 the mode, the more expensive it is.  */
       if (! MODES_TIEABLE_P (GET_MODE (x), GET_MODE (SUBREG_REG (x))))