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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/52890] Revision 185336 causes 10% degradation on cpu2000 benchmark 252.eon
Date: Fri, 14 Sep 2012 13:55:00 -0000 [thread overview]
Message-ID: <bug-52890-4-JFQm959EeH@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-52890-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52890
--- Comment #11 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-09-14 13:55:04 UTC ---
(In reply to comment #10)
>
> Martin,
> Have you done any more digging on this? I just discovered that cpu2006
> benchmark 471.omnetpp suffers the same problem (8 byte loads turned in to
> sequence of byte loads/shifts/ors). It causes a 12% degradation on PowerPC, and
> also goes away when -fno-ipa-sra is added. I'm attaching a reduced testcase
> that can be compiled with g++ -S -O3 -m64 -mcpu=power7.
Thanks for the reduced testcase. This PR is still on my radar but so
far other issues have had higher priority. On the other hand, I agree
I have not looked at this for too long, I'll do my best to look at it
soon. I can't promise much in the next 2-3 weeks, though.
next prev parent reply other threads:[~2012-09-14 13:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-06 16:59 [Bug middle-end/52890] New: " pthaugen at gcc dot gnu.org
2012-04-06 21:14 ` [Bug middle-end/52890] " pthaugen at gcc dot gnu.org
2012-04-10 12:07 ` rguenth at gcc dot gnu.org
2012-04-10 16:14 ` pthaugen at gcc dot gnu.org
2012-04-10 17:53 ` pthaugen at gcc dot gnu.org
2012-04-11 14:32 ` jamborm at gcc dot gnu.org
2012-04-11 15:54 ` jamborm at gcc dot gnu.org
2012-04-11 16:06 ` jamborm at gcc dot gnu.org
2012-04-11 18:35 ` pthaugen at gcc dot gnu.org
2012-04-17 15:53 ` jamborm at gcc dot gnu.org
2012-09-12 15:24 ` dje at gcc dot gnu.org
2012-09-12 23:05 ` pthaugen at gcc dot gnu.org
2012-09-14 13:55 ` jamborm at gcc dot gnu.org [this message]
2012-11-27 20:48 ` jamborm at gcc dot gnu.org
2012-11-30 16:12 ` jamborm at gcc dot gnu.org
2012-12-03 13:26 ` jamborm at gcc dot gnu.org
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