From: Mark H Weaver <mhw@netris.org>
To: "Glenn Michaels" <gmichaels@Safe-mail.net>
Cc: 24102@debbugs.gnu.org
Subject: bug#24102: Use guile variable objects as SRFI-111 boxes.
Date: Fri, 05 Aug 2016 00:37:40 -0400 [thread overview]
Message-ID: <8760rfygob.fsf@netris.org> (raw)
In-Reply-To: <87a8grygyc.fsf@netris.org> (Mark H. Weaver's message of "Fri, 05 Aug 2016 00:31:39 -0400")
Mark H Weaver <mhw@netris.org> writes:
> As a result, some important properties of SRFI-111 boxes do not hold for
> your proposed implementation. For example, in SRFI-111, (box? x)
> implies that (box-ref x) will not raise an exception, and this fact can
> be exploited by a compiler to produce better native code for 'box-ref'
> when the type of its argument is known to be a box. In such cases, I
> guess 'box-ref' can be implemented as a single load instruction, whereas
> 'variable-ref' will require a conditional branch.
s/box-ref/unbox/g
Mark
next prev parent reply other threads:[~2016-08-05 4:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-29 9:21 bug#24102: Use guile variable objects as SRFI-111 boxes Glenn Michaels
2016-08-02 10:25 ` Glenn Michaels
2016-08-04 20:59 ` Andy Wingo
2016-08-05 4:31 ` Mark H Weaver
2016-08-05 4:37 ` Mark H Weaver [this message]
2016-08-18 13:07 ` Glenn Michaels
2016-08-18 16:14 ` Mark H Weaver
2016-08-31 9:03 ` Andy Wingo
2017-03-01 8:51 ` Andy Wingo
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