From: Mark Mielke <mark@mark.mielke.cc>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: rpm <rajendra.mishra@timesys.com>,
Jesse Pollard <pollard@tomcat.admin.navo.hpc.mil>,
Nikita@Namesys.COM, Andrey Ulanov <drey@rt.mipt.ru>,
linux-kernel@vger.kernel.org
Subject: Re: FPU, i386
Date: Thu, 25 Apr 2002 11:24:35 -0400 [thread overview]
Message-ID: <20020425112435.A16346@mark.mielke.cc> (raw)
In-Reply-To: <200204251310.g3PD9dI00738@localhost.localdomain> <Pine.LNX.3.95.1020425095821.6728B-100000@chaos.analogic.com>
On Thu, Apr 25, 2002 at 10:22:49AM -0400, Richard B. Johnson wrote:
> To use the math macros, the comparison should be something like:
> if (isless(fabs(a-b), 1.0e-38))
> break;
I might be saying something stupid, but, I was under the impression
that floating point '==', assuming it follows IEEE rules, does exactly
this.
I know for certain that it does not do memcmp(), as it has to deal
with the exponent and mantissa being each off by +/-1 and <</>>1
respectively.
mark
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next prev parent reply other threads:[~2002-04-25 15:30 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-17 14:40 FPU, i386 Jesse Pollard
2002-04-17 14:49 ` John Alvord
2002-04-18 8:31 ` Jakob Østergaard
2002-04-25 13:09 ` rpm
2002-04-25 13:22 ` Andreas Schwab
2002-04-25 14:22 ` Richard B. Johnson
2002-04-25 15:24 ` Mark Mielke [this message]
2002-04-25 16:08 ` Richard B. Johnson
-- strict thread matches above, loose matches on Subject: below --
2002-04-29 16:19 Kerl, John
2002-04-26 22:10 Kerl, John
2002-04-29 12:33 ` Richard B. Johnson
[not found] <scc7dcc8.053@mail-02.med.umich.edu>
2002-04-25 14:52 ` Richard B. Johnson
2002-04-25 14:38 Nicholas Berry
2002-04-17 14:05 Andrey Ulanov
2002-04-17 14:20 ` Mike Black
2002-04-17 14:26 ` Richard B. Johnson
2002-04-17 14:29 ` Nikita Danilov
2002-04-17 15:20 ` Gunther Mayer
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