From: Bakul Shah <bakul@bitblocks.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] circular fonctions: precision?
Date: Sun, 2 Oct 2011 12:14:31 -0700 [thread overview]
Message-ID: <20111002191431.D7DA7B852@mail.bitblocks.com> (raw)
In-Reply-To: Your message of "Sun, 02 Oct 2011 14:44:35 EDT." <1a3de3d2869ab078c9a4fdf9bce44982@brasstown.quanstro.net>
On Sun, 02 Oct 2011 14:44:35 EDT erik quanstrom <quanstro@quanstro.net> wrote:
> > IEEE754-1985 didn't specify circular, hyperbolic or other
> > advanced functions. You can have 754 compliant hardware and
> > not implement these functions. In any case the standard can
> > not dictate the accuracy of functions not specified in it. An
> > iterative algorithm may lose more than 1 bit of accuracy since
> > iterations won't be done in infinite precision. One can not
> > assume accuracy to a bit even where these functions are
> > imeplemented in h/w. For x86, accuracy may be specified in
> > some Intel or AMD manual.
>
> that wasn't my reading of the spec. so you're saying that if
> the iterative algorithm loops 53 times, it's free to return any
> answer whatever and still be compliant?
That was my reading (but it was a long time ago and I am not a
numerical analyst lawyer. So caveat emptor. You get what you
pay for. etc.) But if you expect to sell your library
presumably you'd care about the quality of impementation!
next prev parent reply other threads:[~2011-10-02 19:14 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-02 16:38 tlaronde
2011-10-02 17:52 ` Bakul Shah
2011-10-02 18:06 ` erik quanstrom
2011-10-02 18:40 ` Bakul Shah
2011-10-02 18:44 ` erik quanstrom
2011-10-02 18:59 ` andrew zerger
2011-10-02 19:04 ` tlaronde
2011-10-02 19:14 ` Bakul Shah [this message]
2011-10-02 19:18 ` erik quanstrom
2011-10-02 18:44 ` tlaronde
2011-10-02 18:48 ` tlaronde
2011-10-02 18:28 ` tlaronde
2011-10-02 19:06 ` Bakul Shah
2011-10-03 11:41 ` tlaronde
2011-10-03 14:39 ` Bakul Shah
2011-10-03 14:46 ` erik quanstrom
2011-10-03 15:29 ` Bakul Shah
2011-10-03 15:58 ` Bakul Shah
2011-10-03 16:49 ` tlaronde
2011-10-03 13:03 ` Russ Cox
2011-10-03 14:44 ` Bakul Shah
2011-10-03 14:57 ` Russ Cox
2011-10-03 15:34 ` Bakul Shah
2011-10-03 15:47 ` Russ Cox
2011-10-03 16:53 ` tlaronde
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