http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49442
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.06.16 15:23:05
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-16
15:23:05 UTC ---
Does -mtune=barcelona improve it? What Intel CPUs? I suppose the vectorizer
cost model could be adjusted for -mtune=generic? I suppose the old rev.
is equivalent to -fno-tree-vectorize?
On AMD K8 I get
38.26user 0.12system 0:38.42elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
with vectorization and
31.09user 0.08system 0:31.21elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
without. With -mtune=barcelona I get
37.08user 0.20system 0:37.39elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
and the following with native tuning
32.93user 0.25system 0:33.20elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
(movlpd instead of movsd and incl instead of add difference to generic only).
So, confirmed on AMD K8 as well.
