Re: IEEE arithmetic handling

Walter Bright <bright@nazgul.uucp>
Thu, 7 Jan 1993 08:10:45 GMT

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Re: IEEE arithmetic handling eggert@twinsun.com (1992-11-17)
Re: IEEE arithmetic handling tmb@arolla.idiap.ch (1992-11-18)
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Re: IEEE arithmetic handling bill@amber.csd.harris.com (1992-11-20)
Re: IEEE arithmetic handling bill@amber.csd.harris.com (1992-11-20)
Re: IEEE arithmetic handling Dik.Winter@cwi.nl (1992-11-23)
Re: IEEE arithmetic handling bright@nazgul.uucp (Walter Bright) (1993-01-07)
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Newsgroups: comp.compilers
From: Walter Bright <bright@nazgul.uucp>
Organization: Compilers Central
Date: Thu, 7 Jan 1993 08:10:45 GMT
Keywords: optimize, arithmetic
References: 92-11-041

jim@meiko.co.uk (James Cownie) writes:
/Another area where IEEE seems never to be implemented correctly by
/compilers is in the handling of Not a Numbers (NaNs).
/Similarly (and I've never seen this handled right in an optimising
/compilation),
/ IF (X .ne. X) THEN
/ print *,'X is a NaN'
/ ELSE
/ print *,'X is a number'


Zortech C/C++ 3.0 does implement and handle these cases correctly,
even when optimized (!)
--

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