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Date: Wed, 7 Mar 2001 12:23:05 +0100
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: Cygwin ML <cygwin AT cygwin DOT com>
Subject: Re: return value of log()
Message-ID: <20010307122305.H21275@cygbert.vinschen.de>
Mail-Followup-To: Cygwin ML <cygwin AT cygwin DOT com>
References: <m37l21hosy DOT wl AT nifty DOT com>
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In-Reply-To: <m37l21hosy.wl@nifty.com>; from muraken2@nifty.com on Wed, Mar 07, 2001 at 07:10:53PM +0900

On Wed, Mar 07, 2001 at 07:10:53PM +0900, Kenta MURATA wrote:
> Hi there,
> 
> I can't understand that log(x) returns -HUGE_VAL if x < 0.
> Becaus, IEEE definition returns NaN.
> 
> Why adopt this implementation?

In the newlib sources I found:

  /* Check for domain error here. */
  if (x <= 0.0)
    {
      errno = ERANGE;
      return (z_notanum.d);
    }

and AFAICS z_notanum is different from -HUGE_VAL. I suggest asking
in the newlib mailing list mailto:newlib AT sources DOT redhat DOT com

Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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