From: Paul Eggert <eggert@cs.ucla.edu>
To: "Herbert J. Skuhra" <herbert@mailbox.org>
Cc: emacs-devel@gnu.org
Subject: Re: USE_LSB_TAG not supported on this platform
Date: Sat, 6 Feb 2016 12:34:40 -0800 [thread overview]
Message-ID: <56B658E0.6090508@cs.ucla.edu> (raw)
In-Reply-To: <86mvrejegc.wl-herbert@mailbox.org>
Herbert J. Skuhra wrote:
> INTPTR_MAX=0x7fffffff
> EMACS_INT_MAX=0x7fffffffffffffffLL
>
> Before the commit mentioned above both are 0x7fffffff.
Commit d6585a910ed3e9e0e43c093b5fbfeb6d56b703b4 should not have affected
EMACS_INT_MAX, and I don't see how it did.
I assume you are not configuring with --with-wide-int, so the reason
EMACS_INT_MAX has that large value is due to the following tests in src/lisp.h:
# if INTPTR_MAX <= 0
# error "INTPTR_MAX misconfigured"
# elif INTPTR_MAX <= INT_MAX >> NONPOINTER_BITS && !defined WIDE_EMACS_INT
...
# elif INTPTR_MAX <= LONG_MAX >> NONPOINTER_BITS && !defined WIDE_EMACS_INT
...
# elif INTPTR_MAX <= LLONG_MAX
...
# define EMACS_INT_MAX LLONG_MAX
#endif
Is the value of NONPOINTER_BITS 0 on your platform, or 3? If 0, is this
correct? That is, does malloc ever return a pointer that, when treated as an
integer, is not a multiple of 8? If malloc always returns a multiple of 8, then
we should be able to work around the problem by setting NONPOINTER_BITS to 0 on
your platform.
next prev parent reply other threads:[~2016-02-06 20:34 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-04 8:32 USE_LSB_TAG not supported on this platform C. Baxter
2016-02-04 13:24 ` Stefan Monnier
2016-02-04 15:51 ` Paul Eggert
2016-02-04 22:29 ` Herbert J. Skuhra
2016-02-05 1:22 ` Paul Eggert
2016-02-05 9:45 ` Colin Baxter
2016-02-06 10:55 ` Herbert J. Skuhra
2016-02-06 16:04 ` Herbert J. Skuhra
2016-02-07 15:11 ` Wolfgang Jenkner
2016-02-07 19:14 ` Herbert J. Skuhra
2016-02-07 21:35 ` Herbert J. Skuhra
2016-02-08 19:45 ` Paul Eggert
2016-02-08 20:14 ` Eli Zaretskii
2016-02-09 8:39 ` Paul Eggert
2016-02-09 16:59 ` Eli Zaretskii
2016-02-09 17:37 ` Paul Eggert
2016-02-09 18:02 ` Eli Zaretskii
2016-02-10 19:29 ` Colin Baxter
2016-02-08 23:01 ` Herbert J. Skuhra
2016-02-09 1:10 ` Paul Eggert
2016-02-09 11:12 ` Herbert J. Skuhra
2016-02-09 23:37 ` Paul Eggert
2016-02-09 15:53 ` Wolfgang Jenkner
2016-02-09 23:33 ` Paul Eggert
2016-02-06 20:34 ` Paul Eggert [this message]
2016-02-07 16:52 ` Herbert J. Skuhra
2016-02-07 21:34 ` Paul Eggert
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