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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Can compilers do this?
Date: 1996/02/23
Message-ID: <dewar.825137355@schonberg>#1/1
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references: <4gjd6g$mfq@newsbf02.news.aol.com> <4gl344$q4j@wdl1.wdl.loral.com>
 <Dn99FB.Dn@world.std.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-02-23T00:00:00+00:00
List-Id: <comp.lang.ada>

Robert Duff said, answering a question

">My guess is that on that machine signed zeros exist and that -0.0 < 0.0
>and that -0.0 * 0.0 => 0.0, thus the above gives the right answer when
>given a -0.0.

Ada 83 doesn't say anything about signed zeros."

Yes, true, but even in Ada 83 if a compiler 

(a) generated -0.0 values as the result of executing correct Ada code

and

(b) gave a result of false for -0.0 = +0.0, or true for -0.0 < +0.0

then this would plainly be a (significant) bug in the compiler