Date: Thu, 1 Dec 2011 00:02:43 +0000 From: Alexander Best <arundel@freebsd.org> To: Igor Mozolevsky <mozolevsky@gmail.com> Cc: freebsd-wireless@freebsd.org Subject: Re: comparing floating points via "==" or "!=" Message-ID: <20111201000243.GB44877@freebsd.org> In-Reply-To: <CADWvR2herXkcMaZXFKm_ALBXnVFDhRCNZ-9%2B-MwHVx5XJPG4AA@mail.gmail.com> References: <20111130224422.GA36424@freebsd.org> <CADWvR2herXkcMaZXFKm_ALBXnVFDhRCNZ-9%2B-MwHVx5XJPG4AA@mail.gmail.com>
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On Wed Nov 30 11, Igor Mozolevsky wrote:
> On 30 November 2011 22:44, Alexander Best <arundel@freebsd.org> wrote:
>
> > i played a bit with the gcc -Wfloat-equal warning and noticed that inside
> > sys/dev/ath/ath_rate/sample/tx_schedules.h, a lot of comparisons of floating
> > points are happening ("=="). is there a better way to deal with this?
>
> as opposed to (abs(a-b) < tolerance)?
fabs(3) actually, or some other way, e.g. described in:
http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
cheers.
alex
>
>
> Cheers,
>
> --
> Igor :-)
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