From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Cc: libc-alpha@sourceware.org
Subject: Re: Fix the inaccuracy of j0f/y0f/j1f/y1f
Date: Thu, 25 Feb 2021 08:24:12 -0300 [thread overview]
Message-ID: <ee2b8e3b-aaaa-214b-dc8a-8ac620abc843@linaro.org> (raw)
In-Reply-To: <mwzgzsfnml.fsf@salade.loria.fr>
On 25/02/2021 07:27, Paul Zimmermann wrote:
> Dear Adhemerval,
>
>> I have checked your set on different architectures [...]
>
> thank you, I can reproduce the failures on the GCC compile farm.
> So far it is just due to some ranges around zeroes that are too
> narrow. I guess it is due to the fact that computations on x86_64
> are done using double extended precision. Btw is there a way to
> disable that when building glibc?
Afaik -mfpmath=sse is the default for x86_64, so I am not sure the
extension precision on x86_64 s the culprit here.
I noted that cosf shows a better precision on x86_64 compared to
other architectures (based on glibc own ulp files), so it might
be the origin of the difference.
next prev parent reply other threads:[~2021-02-25 11:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-19 9:02 Paul Zimmermann
2021-02-19 16:44 ` Michael Morrell
2021-02-19 21:15 ` Joseph Myers
2021-02-21 7:37 ` Paul Zimmermann
2021-02-23 19:07 ` Michael Morrell
2021-02-23 19:34 ` Joseph Myers
2021-02-24 18:59 ` Adhemerval Zanella
2021-02-25 10:27 ` Paul Zimmermann
2021-02-25 11:24 ` Adhemerval Zanella [this message]
2021-02-26 6:40 ` Paul Zimmermann
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