From: Roland Orre <roland.orre@neurologic.se>
Subject: 64bit guile: one bug found, one improvement suggested
Date: Wed, 27 Jul 2005 02:42:29 +0200 [thread overview]
Message-ID: <1122424950.8714.138.camel@bari.bacon.su.se> (raw)
In-Reply-To: <873bq1gn15.fsf@zagadka.de>
The (small) bug may be corrected in later version (I'm still
using the old style (early 1.7) uniform arrays). The improvement
suggested below is actually part of a general 32/64 bit problem.
bug:
size of scm_tc7_ivect and scm_tc7_uvect is long, but should be int.
causes: on 64 bit machine, there are no 32 bit int vectors available.
(I've fixed this locally)
improvement suggestion:
size of SCM should be configurable to 32 bit on 64 bit machine.
As it is now, it causes a lot of wasted memory and I guess also
unnecessary usage of memory band width.
This is a somewhat bigger change as most addressing needs to be
base relative. I guess there are utilites available to allocate
memory within certain (e.g. 32 bit) boundaries, (there was in VMS
I used once) but haven't found any in GNU/Linux, apart from
possibly start in mmap.
Maybe even gcc provides a nice solution to this, but haven't
found anything (someth like: short pointer and long pointer
which I think I've seen in some languages long time ago).
/Roland Orre
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next prev parent reply other threads:[~2005-07-27 0:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-26 23:33 The order of objects returned from a guardian Marius Vollmer
2005-07-27 0:42 ` Roland Orre [this message]
2005-07-28 22:37 ` Neil Jerram
2005-07-31 19:31 ` Marius Vollmer
2005-07-31 21:25 ` Marius Vollmer
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