From: REAL <root@mmedia2.kemsu.ru>
To: ALT Linux Team development discussions <devel@lists.altlinux.org>
Subject: Re: [devel] ATLAS: -mfpmath=387
Date: Mon, 18 Oct 2010 15:46:21 +0800
Message-ID: <4CBBFB4D.4060400@mmedia2.kemsu.ru> (raw)
In-Reply-To: <20101018082730.GB3548@belkar.wrar.name>
Andrey Rahmatullin пишет:
>> В спеке есть такая конструкция:
>> %add_optflags -mfpmath=387
>>
>> Где-то недавно краем уха зацепил, что на данный момент есть более
>> оптимальный способ, но беглый поиск ничего вразумительного не дал.
> man gcc
Ясности не прибавилось. Там дают 3 варианта на выбор: 387, sse, sse,387
В случае sse пугают, что "The resulting code should be considerably
faster in the majority of cases and avoid the numerical instability
problems of 387 code, but may break some existing code that expects
temporaries to be 80bit."
В случае sse,387: "Use this option with care, as it is still
experimental, because the GCC register allocator does not model
separate functional units well resulting in instable performance."
Получается, надо оставить как есть?
--
REAL aka Евгений Ростовцев, программист ЦНИТ КемГУ
prev parent reply other threads:[~2010-10-18 7:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-18 7:30 REAL
2010-10-18 8:27 ` Andrey Rahmatullin
2010-10-18 7:46 ` REAL [this message]
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