From: Alexey Starovoytov <starlex@eng.sun.com>
To: Andi Kleen <ak@suse.de>
Cc: <gcc@gcc.gnu.org>
Subject: Re: contribution
Date: Fri, 12 Apr 2002 11:42:00 -0000 [thread overview]
Message-ID: <Pine.GSO.4.31.0204121042030.15886-100000@boojum> (raw)
In-Reply-To: <p73d6x5bd3c.fsf@oldwotan.suse.de>
On 12 Apr 2002, Andi Kleen wrote:
> Alexey Starovoytov <starlex@eng.sun.com> writes:
>
> > For example SPECfp benchmark 172.mgrid showed 48% improvement
> > compiled with "-O2 -Ws,-O2,-fno-strict-aliasing" vs plain GCC with "-O2"
>
> You could compiled 172.mgrid with gcc twice this way and it showed 48%
> improvement ? Or did you use a different compiler as backend?
It was gcc3.0.4 as a backend.
Environment:
US2 450Mhz Solaris 2.8
gcc_3.0.4 -O2:
Success 172.mgrid ratio=59.73, runtime=3013.766979
GCC_3.0.4 -> C -> GCC_3.0.4 -O2 -Ws,-O2,-fno-strict-aliasing
Success 172.mgrid ratio=88.55, runtime=2032.768725
GCC_3.1 -> C -> GCC_3.0.4 -O2 -Ws,-O2,-fno-strict-aliasing
Success 172.mgrid ratio=98.22, runtime=1832.557732
> If you used gcc - is it known where that huge difference comes from?
I didn't have time to check.
Best regards,
Alexey.
next prev parent reply other threads:[~2002-04-12 17:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.GSO.4.31.0204112030350.15026-101000@boojum.suse.lists.egcs-patches>
2002-04-12 1:28 ` contribution Andi Kleen
2002-04-12 11:42 ` Alexey Starovoytov [this message]
2002-04-12 15:15 ` contribution Toon Moene
2002-04-12 5:45 contribution Toon Moene
[not found] <3CB6D448.45A4FE3E@knmi.nl.suse.lists.egcs>
2002-04-12 5:54 ` contribution Andi Kleen
2002-04-12 5:58 ` contribution Toon Moene
[not found] <CAOw3FZBzjtxEmbSMJDviD-td4bDM_mCMs9BQpk0SvK4EpR8N5g@mail.gmail.com>
2022-03-14 8:35 ` Fwd: Contribution farhad
2022-03-14 16:51 ` Contribution David Edelsohn
2022-12-14 15:32 Contribution Mohamed Atef
2022-12-15 14:47 ` Contribution Jason Merrill
2022-12-15 16:42 ` Contribution Paul Smith
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