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From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com
Subject: Re: [musl] issue with exp10l
Date: Fri, 08 Jan 2021 10:06:53 +0100	[thread overview]
Message-ID: <mwa6tjlrv6.fsf@tomate.loria.fr> (raw)
In-Reply-To: <20210107200250.GG22981@brightrain.aerifal.cx> (message from Rich Felker on Thu, 7 Jan 2021 15:02:50 -0500)

       Dear Rich,

> OK, on further investigation it looks like your problem is that you're
> not passing a NAN but a trap representation. The representation is
> only a nan if the exponent value is 0x7fff. For exponent not 0x7fff or
> 0, the high bit of the significand must be set; otherwise it's a trap
> representation.

thank you. I have now forced the high bit of the significand to be set,
and it works better indeed. I have found errors up to 40 ulps for exp10l:

exp10l 0xd.41cfe8659e3d7eep+8l 40.1

Best regards,
Paul

      reply	other threads:[~2021-01-08  9:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-07 11:17 Paul Zimmermann
2021-01-07 19:49 ` Rich Felker
2021-01-07 20:02   ` Rich Felker
2021-01-08  9:06     ` Paul Zimmermann [this message]

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