From: Mark H Weaver <mhw@netris.org>
To: bil@ccrma.Stanford.EDU
Cc: 30426@debbugs.gnu.org
Subject: bug#30426: division inconsistency?
Date: Mon, 12 Feb 2018 16:15:51 -0500 [thread overview]
Message-ID: <87sha5q588.fsf@netris.org> (raw)
In-Reply-To: <874lmlrkgc.fsf@netris.org> (Mark H. Weaver's message of "Mon, 12 Feb 2018 16:01:39 -0500")
Mark H Weaver <mhw@netris.org> writes:
> Our core '/' operator, as defined in numbers.c, raises an exception for
> (/ x 0), for any 'x'. This does not conform to the R6RS, which
> specifies that (/ 0.0 0) => +inf.0. I don't think that rule makes sense
Sorry, I meant to write (/ 1.0 0) => +inf.0, which is one of the
examples given in the R6RS.
> because the sign of the result cannot be justified. (/ 1 0.0) => +inf.0
> and (/ 1 -0.0) => -inf.0 are more justifiable because of the signed
> inexact zeroes, but an exact zero is not signed.
>
> However, it may be that we should change this to conform to the R6RS,
> and certainly it would be good for our compiler and interpreter to agree
> on all of these edge cases.
Mark
next prev parent reply other threads:[~2018-02-12 21:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-11 22:56 bug#30426: division inconsistency? bil
2018-02-12 21:01 ` Mark H Weaver
2018-02-12 21:15 ` Mark H Weaver [this message]
2018-02-12 21:59 ` bil
2018-02-14 20:54 ` Mark H Weaver
2018-02-14 22:10 ` bil
2018-02-15 7:35 ` Mark H Weaver
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