From: Mark H Weaver <mhw@netris.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: Andy Wingo <wingo@igalia.com>, guile-devel <guile-devel@gnu.org>
Subject: Re: Immediate doubles (up to 2^256) and rationals coming to Guile 3
Date: Tue, 11 Jun 2019 07:34:08 -0400 [thread overview]
Message-ID: <87tvcw73uc.fsf@netris.org> (raw)
In-Reply-To: <87d0jk5xdh.fsf@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\= \=\?utf-8\?Q\?s\?\= message of "Tue, 11 Jun 2019 10:39:38 +0200")
Ludovic Courtès <ludo@gnu.org> writes:
> Though an immediate, like a fixnum or an iflo, is still something
> different from a tagged heap object like a pair, right?
I should clarify that in this new approach, a pair is *not* a tagged
heap object. Tagged heap objects are those which have a tag in their
first word. In this new approach, pairs are not tagged in this sense,
and it is no longer possible to distinguish a pair from a non-pair by
looking at their raw heap blocks.
Tagged heap objects (thobs) have 000 in the low 3 bits of the SCM.
Pairs have 0110 in the low 4 bits of the SCM.
Regards,
Mark
next prev parent reply other threads:[~2019-06-11 11:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 9:40 Immediate doubles (up to 2^256) and rationals coming to Guile 3 Mark H Weaver
2019-06-06 12:56 ` Mark H Weaver
2019-06-06 19:37 ` Arne Babenhauserheide
2019-06-12 0:03 ` Mark H Weaver
2019-06-06 20:09 ` tomas
2019-06-07 19:46 ` Ludovic Courtès
2019-06-09 16:56 ` Mark H Weaver
2019-06-09 17:30 ` Mark H Weaver
2019-06-11 8:39 ` Ludovic Courtès
2019-06-11 10:58 ` Mark H Weaver
2019-06-11 12:21 ` Ludovic Courtès
2019-06-11 11:34 ` Mark H Weaver [this message]
2019-06-08 1:13 ` Mark H Weaver
2019-06-08 8:07 ` Arne Babenhauserheide
2019-06-08 9:08 ` Chris Vine
2019-06-08 9:46 ` Arne Babenhauserheide
2019-06-08 10:24 ` Chris Vine
2019-06-08 13:12 ` Hans Åberg
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