From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: Dmitry Antipov <antipov@mvista.com>, emacs-devel@gnu.org
Subject: Re: immediate strings #2
Date: Tue, 29 Nov 2011 00:50:17 -0800 [thread overview]
Message-ID: <4ED49CC9.6080808@cs.ucla.edu> (raw)
In-Reply-To: <jwvfwh7adml.fsf-monnier+emacs@gnu.org>
On 11/28/11 18:07, Stefan Monnier wrote:
> There are bits available in size and size_byte, we
> have to use those (like we currently do with gcmarkbit in `size')
There is a bit available in size (since it's always nonnegative)
but not in size_byte (since it ranges from -1 .. PTRDIFF_MAX
and is a ptrdiff_t, assuming a 32-bit host configured --with-wide-int
and assuming the memory-saving patch of Bug#9874).
This is in contrast with our current uses of mark bits (e.g.,
ARRAY_MARK_FLAG), which use bits that are otherwise unused, even if
a vector has its maximal size.
We can fairly easily get that bit back from size_byte by restricting
its range to (say) 0 .. PTRDIFF_MAX.
So this is a fairly minor glitch that can be fixed but is not yet
fixed in the current proposal.
next prev parent reply other threads:[~2011-11-29 8:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-28 9:11 immediate strings #2 Dmitry Antipov
2011-11-28 17:33 ` Stefan Monnier
2011-11-28 19:48 ` Ken Raeburn
2011-11-28 20:10 ` Andreas Schwab
2011-11-28 21:54 ` Stefan Monnier
2011-11-28 22:25 ` Andreas Schwab
2011-11-29 0:57 ` Ken Raeburn
2011-11-29 8:44 ` Andreas Schwab
2011-11-29 15:48 ` Ken Raeburn
2011-11-29 16:08 ` Andreas Schwab
2011-11-30 16:43 ` Ken Raeburn
2011-11-28 22:18 ` Paul Eggert
2011-11-29 2:07 ` Stefan Monnier
2011-11-29 3:37 ` Dmitry Antipov
2011-11-29 8:50 ` Paul Eggert [this message]
2011-11-30 5:37 ` Dmitry Antipov
2011-11-30 9:35 ` Paul Eggert
2011-11-30 16:43 ` Ken Raeburn
2011-11-30 21:44 ` Paul Eggert
2011-11-29 3:17 ` Dmitry Antipov
2011-11-29 5:29 ` Dmitry Antipov
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