gcc/gcc ChangeLog cse.c

[sayle@gcc.gnu.org]

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_4-branch
Changes by:	sayle@gcc.gnu.org	2004-10-26 18:05:45

Modified files:
	gcc            : ChangeLog cse.c 

Log message:
	* cse.c: Change encoding of quantity numbers to avoid undefined
	pointer arithmetic on qty_table.
	(REGNO_QTY_VALID_P): A quantity is now valid if it isn't negative.
	(get_cse_reg_info): Initialize reg_qty to a unique negative value.
	(new_basic_block): Assign "real" quantity numbers from zero.
	(delete_reg_equiv): Do nothing if quantity is invalid.  Reset the
	REG_QTY to its unique negative value.
	(merge_equiv_classes): Calculate need_rehash if quantity is valid.
	(cse_main): Don't include max_reg when determining max_qty.
	(cse_basic_block): Avoid subtracting a large offset from qty_table,
	which causes undefined C99 behaviour.  Only allocate needed memory.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=2.2326.2.673&r2=2.2326.2.674
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cse.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.278.4.7&r2=1.278.4.8