From: John Carr <jfc@MIT.EDU>
To: Shawn Wagner <shawnw@speakeasy.org>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Finding the sign of a float
Date: Sat, 01 Feb 2003 07:56:06 -0500 [thread overview]
Message-ID: <200302011256.HAA06393@nerd-xing.mit.edu> (raw)
In-Reply-To: Your message of "Fri, 31 Jan 2003 22:35:21 PST." <20030131223521.T22850@speakeasy.org>
> I'm looking for a way, in pure ocaml without having to bail out to C, to
> tell if a float is negative or not.
>
> Just using x < 0.0 won't work, as I need to be able to tell the difference
> between -0.0 and +0.0. This is for ocaml versions of the C copysign and
> signbit functions. Any suggestions?
x < 0.0 || (x = 0.0 && 1.0/.x < 0.0)
may be faster than converting the bits to integer, or slower,
depending on platform and context, and how often you encounter -0.
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next prev parent reply other threads:[~2003-02-01 13:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-01 6:35 Shawn Wagner
2003-02-01 9:05 ` Chris Hecker
2003-02-01 12:56 ` John Carr [this message]
2003-02-01 14:11 ` malc
2003-02-01 18:05 ` Shawn Wagner
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