Dear Evgeniya,
Maybe missed optimizations in vectorizer will be interesting to you
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
It has a lot of open tasks that can highly influence the performance,
but many of them have not been solved for long years.
For now gcc vectorizer works in some number of patterns, but there are a
lot of ones that are implemented in icc or llvm and not implemented in gcc.
Best regards.
Ilya
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*From:* Evgeniya Maenkova <evgeniya.maenk...@gmail.com>
*Sent:* Friday, August 15, 2014 4:45PM
*To:* gcc@gcc.gnu.org
*Subject:* What are open tasks about GIMPLE loop optimizations?
Dear GCC Developers,
Nobody answers my question below, so perhaps something wrong with my email :)
So let me clarify in more details what I’m asking about.
I’ve made some very very very basic evaluation of GCC code ([1]) and
started to think about concrete task to contribute to GCC (language
and machine optimization would be interesting to me, in particular,
loop optimization).
I cannot invent this task myself because my knowledge of GCC and
compilers in general is not enough for this. And even if I could
think out something perhaps GCC developers have their own
understanding of the world.
Then I have looked at GCC site to answer my question. What I could
find about loop optimizations is information from GNU Tools Cauldron
2012, “Status of High level Loop Optimizations”. So perhaps this is
out-of-date in 2014.
Unfortunately, I have not enough time, so I would not commit to manage
a task which is on the critical task. (Are you interested only in
full time developers?)
So it would be great if you could advise some tasks, which could be
useful to gcc in some future, however nobody will miss if I cannot do
it (as you had not time/people for these tasks anyway :) ).
What do you think?
Thanks,
Evgeniya
[1] Used GDB to look inside GCC. Wrote some notes in my blog which
could be useful to other newbies
(http://perfstories.wordpress.com/2013/11/17/compiler-internals-introduction-to-a-new-post-series/).
---------- Forwarded message ----------
From: Evgeniya Maenkova <evgeniya.maenk...@gmail.com>
Date: Fri, Aug 8, 2014 at 6:50 PM
Subject: GIMPLE optimization passes: any Road Map?
To: gcc@gcc.gnu.org
Dear GCC Developers!
Could you please clarify about GIMPLE loop passes?
Where could I find the latest changes in these passes? Is it trunk or
some of the branches? May I look at some RoadMap on GIMPLE loop
optimizations?
Actually, I ask these questions because I would like to contribute to
GCC. GIMPLE optimizations would be interesting to me (in particular,
loop optimizations).
However, I’m newbie at GCC and have not enough time, so would not
commit to manage a task which is on the critical path.
So it would be great if you could advise some tasks, which could be
useful to gcc in some future, however nobody will miss if I can’t do
it (as you had not time/people for these tasks anyway :) ).
Thank you!
Evgeniya
