r157835 - in /trunk/gcc: ChangeLog var-tracking.c

[jakub@gcc.gnu.org]

Author: jakub
Date: Tue Mar 30 20:17:39 2010
New Revision: 157835

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=157835
Log:
	* var-tracking.c (use_narrower_mode_test, use_narrower_mode): New
	functions.
	(adjust_mems): Replace narrowing SUBREG of expression containing
	just PLUS, MINUS, MULT and ASHIFT of registers and constants
	with operations in the narrower mode.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/var-tracking.c