------- Comment #4 from rguenth at gcc dot gnu dot org 2009-06-20 17:01 -------
With MAX_DOMINATORS_TO_WALK zero and find_loop_niter_by_eval completely
disabled
(checking enabled compiler, built with -O0):
tree iv optimization : 11.12 ( 6%) usr 0.07 ( 5%) sys 12.02 ( 6%) wall
59123 kB (20%) ggc
With just find_loop_niter_by_eval disabled:
tree iv optimization : 10.81 ( 6%) usr 0.05 ( 3%) sys 11.44 ( 6%) wall
59123 kB (20%) ggc
so that's it. Restricting find_loop_niter_by_eval to single-exit loops
if !flag_expensive_optimizations results in
tree iv optimization : 10.95 ( 6%) usr 0.04 ( 3%) sys 12.06 ( 6%) wall
59123 kB (20%) ggc
I'll bootstrap & test a patch to do that.
Zdenek - if for one exit we cannot determine the number of executions,
shouldn't we return chrec_dont_know here instead of just examining the
other exits?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2009-06-20 16:43:34 |2009-06-20 17:01:51
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38729
