From: Mark Knecht <markknecht@gmail.com>
To: gentoo-amd64@lists.gentoo.org
Subject: Re: [gentoo-amd64] Possible Math Problem - Request For Verification [Solved]
Date: Sat, 25 Jun 2011 20:54:10 -0700 [thread overview]
Message-ID: <BANLkTim7kf_=YKBvvZ5w4Pq67rtCgVfXyw@mail.gmail.com> (raw)
In-Reply-To: <20110625234418.a66f8d7b.frank.peters@comcast.net>
On Sat, Jun 25, 2011 at 8:44 PM, Frank Peters <frank.peters@comcast.net> wrote:
> On Sat, 25 Jun 2011 13:41:11 -0400
> Frank Peters <frank.peters@comcast.net> wrote:
>
>>
>> /tmp/fp-test-results/clib_DP.output: ucbtest UCBFAIL in cabsd at line 701 for double
>>
>
> The culprit seems to be GCC optimization. If I run the test with either "-O0"
> or "-O1" flags I can eliminate the cabsd failure. Using "-O2" or "-O3" will
> result in the cabsd error.
>
> However, I've used "-O2" previously and had no problems with this test. Possibly,
> some of these new LTO and GRAPHITE capabilities of GCC are to blame, even though
> I do not compile the ucbtest with either LTO or GRAPHITE enabled. But GCC has itself
> been compiled using LTO and GRAPHITE.
>
> Anyway, thanks for all who actually ran the test on their machines. I was
> thinking of filing bug reports with GLIBC and GCC and that would have turned
> out to be foolish. I did check the Changelogs for GLIBC and there doesn't seem
> to have been any modification of the cabs() code over the last several versions.
>
> Frank Peters
I'm using -O2 here on all my machines. Certainly it isn't that option
that causes a problem for everyone. Sounds like something specific to
your processor revision.
Take care,
Mark
next prev parent reply other threads:[~2011-06-26 3:55 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-25 17:41 [gentoo-amd64] Possible Math Problem - Request For Verification Frank Peters
2011-06-25 23:54 ` Marc Joliet
2011-06-26 0:22 ` Mark Knecht
2011-06-26 1:10 ` Frank Peters
2011-06-26 1:28 ` Frank Peters
2011-06-26 3:44 ` [gentoo-amd64] Possible Math Problem - Request For Verification [Solved] Frank Peters
2011-06-26 3:54 ` Mark Knecht [this message]
2011-06-26 4:39 ` Frank Peters
2011-06-26 11:33 ` James Cloos
2011-06-26 12:57 ` Mark Knecht
2011-06-26 16:30 ` Barry Schwartz
2011-06-26 11:30 ` [gentoo-amd64] Possible Math Problem - Request For Verification Volker Armin Hemmann
2011-06-26 12:13 ` Volker Armin Hemmann
2011-06-26 13:17 ` [gentoo-amd64] unsubscribe Piotr Hosowicz
2011-06-26 15:40 ` Dale
2011-06-26 17:26 ` Lie Ryan
2011-06-26 17:31 ` Volker Armin Hemmann
2011-06-26 17:52 ` Dale
2011-06-27 3:22 ` [gentoo-amd64] unsubscribe Duncan
2011-06-26 17:43 ` [gentoo-amd64] unsubscribe Dale
2011-06-26 16:27 ` [gentoo-amd64] Possible Math Problem - Request For Verification Frank Peters
2011-06-26 17:04 ` Volker Armin Hemmann
2011-06-26 17:17 ` Mark Knecht
2011-06-26 17:36 ` Frank Peters
2011-06-26 17:45 ` Volker Armin Hemmann
2011-06-26 17:54 ` Barry Schwartz
2011-06-26 19:01 ` Volker Armin Hemmann
2011-06-26 19:21 ` Barry Schwartz
2011-06-26 19:31 ` Volker Armin Hemmann
2011-06-26 19:49 ` Mark Knecht
2011-06-26 20:33 ` Frank Peters
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