r112484 - in /trunk/gcc: ChangeLog tree-ssa-loo...

[rakdver@gcc.gnu.org]

Author: rakdver
Date: Wed Mar 29 01:41:27 2006
New Revision: 112484

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=112484
Log:
	PR tree-optimization/25985
	* tree-ssa-loop-niter.c (number_of_iterations_le,
	number_of_iterations_ne): Make comments more precise.
	(number_of_iterations_cond): Add only_exit argument.  Use the
	fact that signed variables do not overflow only when only_exit
	is true.
	(loop_only_exit_p): New.
	(number_of_iterations_exit): Pass result of loop_only_exit_p to
	number_of_iterations_cond.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-loop-niter.c