gcc/gcc ChangeLog expmed.c expr.h loop.c

[rth@gcc.gnu.org]

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	rth@gcc.gnu.org	2002-05-30 14:33:35

Modified files:
	gcc            : ChangeLog expmed.c expr.h loop.c 

Log message:
	* expmed.c (const_mult_add_overflow_p): New.
	* expr.h: Declare it.
	* loop.c (maybe_eliminate_biv_1) [COMPARE]: Use it.
	Don't eliminate the biv if the giv has a constant multiplier and
	the rhs argument of the comparison does satisfy the predicate.
	Use expand_mult_add to compute the replacement constant.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=1.14343&r2=1.14344
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expmed.c.diff?cvsroot=gcc&r1=1.117&r2=1.118
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.h.diff?cvsroot=gcc&r1=1.113&r2=1.114
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/loop.c.diff?cvsroot=gcc&r1=1.404&r2=1.405