https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
--- Comment #37 from Peter Cordes ---
Correction, PR82666 is that the cmov on the critical path happens even at -O2
(with GCC7 and later). Not just with -O3 -fno-tree-vectorize.
Anyway, that's related, but probably separate from choosing to do
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
Peter Cordes changed:
What|Removed |Added
CC||peter at cordes dot ca
--- Comment #36 fr
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
--- Comment #35 from Uroš Bizjak ---
(In reply to Uroš Bizjak from comment #26)
> Another analysis by Jake in PR54037:
Eh, PR 54073.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
--- Comment #34 from Yuri Rumyantsev ---
Created attachment 36138
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36138&action=edit
simple reproducer
Use -O3 -std=c++14 options to compile and -fno-tree-loop-if-convert to get
better performa
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
--- Comment #33 from Yuri Rumyantsev ---
With current compiler there is not performance difference for by-ref and by-val
test-cases, but if we turn off if-convert transformation we will get ~2X
speed-up:
on Intel(R) Xeon(R) CPU X5670 @
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
icegood1980 at gmail dot com changed:
What|Removed |Added
CC||icegood1980 at gmail dot co
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
--- Comment #27 from Uros Bizjak 2013-02-17 10:10:16
UTC ---
Some additional analysis:
http://gcc.gnu.org/ml/gcc/2008-02/msg00601.html
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
Uros Bizjak changed:
What|Removed |Added
CC||jake.stine at gmail dot com
--- C
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
Uros Bizjak changed:
What|Removed |Added
Summary|-O3 optimizer generates |conditional moves instead
