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From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
To: newlib@sourceware.org
Cc: vincenzo.innocente@cern.ch
Subject: error in tgamma
Date: Wed, 08 Feb 2023 16:55:51 +0100	[thread overview]
Message-ID: <mwr0v05eyg.fsf@coriandre.loria.fr> (raw)

       Hi,

while testing Newlib 4.3.0, I also noticed the following regression
with respect to 4.2.0 for tgammaf:

zimmerma@tartine:~/svn/tbd/20/src/binary32_exhaustive$ VERBOSE=-v ./doit2.newlib tgamma
Checking tgamma with newlib-4.3.0.20230120
Using RedHat newlib
MPFR library: 4.2.0       
MPFR header:  4.2.0 (based on 4.2.0)
Checking function tgammaf with MPFR_RNDN
...
libm wrong by up to nan ulp(s) [9223372036854775808] for x=-0x1p+0
tgamma      gives inf
mpfr_tgamma gives -nan

For a negative integer, tgamma should return NaN.

Best regards,
Paul Zimmermann

             reply	other threads:[~2023-02-08 15:55 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-08 15:55 Paul Zimmermann [this message]
2023-02-08 16:09 ` error in tgammaf Paul Zimmermann

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