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From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
To: newlib@sourceware.org
Cc: newlib@sourceware.org
Subject: Re: accuracy of mathematical functions
Date: Sat, 06 Feb 2021 07:23:28 +0100	[thread overview]
Message-ID: <mwblcxvhnj.fsf@tomate.loria.fr> (raw)
In-Reply-To: <b6144d60-c23c-858e-f6a5-bf9162ad0a11@SystematicSw.ab.ca> (message from Brian Inglis on Fri, 5 Feb 2021 16:01:39 -0700)

       Dear Brian,

> > I have updated my comparison with the newly released 2.33 version.
> > No big difference with the previous version, except that I included
> > the "long double" format (aka ldbl-96), which is not supported by Newlib.
> > 
> > https://members.loria.fr/PZimmermann/papers/#accuracy
> 
> Thanks for doing this work and making it available is greatly appreciated.

thank you.

> While newlib is mainly targeted to smaller platforms, the Cygwin port math 
> library supports gcc __FLT64X_...__/__FLT128_...__ under
> .../newlib-cygwin/winsup/cygwin/math/ and related includes.

how to get them in libm.a? For example I get only 'ctanhl' available,
but not 'tanhl':

$ nm libm.a | grep tanhl
lib_a-atanhl.o:
lib_a-catanhl.o:
0000000000000000 T catanhl
lib_a-ctanhl.o:
0000000000000000 T ctanhl
lib_a-tanhl.o:

> As you may already be aware, clang and gcc have added support for ARM 
> __FLT16/__fp16, AMD and Intel have added it to x86/amd64 as CVT16/FP16C 
> https://en.wikipedia.org/wiki/F16C, and more compiler and library support are 
> likely to follow, as they are already used in graphics and GPGPU areas.

thank you, if/when they are available in libraries, I will extend my comparison
to those formats.

Best regards,
Paul

  parent reply	other threads:[~2021-02-06  6:23 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-05 10:43 Paul Zimmermann
2021-02-05 23:01 ` Brian Inglis
2021-02-05 23:46   ` Joel Sherrill
2021-02-06  0:40     ` Brian Inglis
2021-02-06  6:23   ` Paul Zimmermann [this message]
2021-08-03  7:59 Paul Zimmermann
2021-09-07 15:01 Paul Zimmermann
2022-02-16  8:42 Accuracy of Mathematical Functions Paul Zimmermann
2022-08-29 10:50 Paul Zimmermann
2023-02-14  8:13 Paul Zimmermann
2023-09-21  7:24 Paul Zimmermann
2024-02-15 14:54 Paul Zimmermann

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