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Re: Compiling Elisp to a native code with a GCC plugin


From: Andreas Schwab
Subject: Re: Compiling Elisp to a native code with a GCC plugin
Date: Fri, 17 Sep 2010 16:40:44 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)

Lars Magne Ingebrigtsen <address@hidden> writes:

> Andreas Schwab <address@hidden> writes:
>
>>> PT + SCHARS (string) can overflow here.  Better check first rather than
>>> later whether ZV - PT < SCHARS (string).
>>>
>>> Yes, I know that most-positive-fixnum <= MAX_INT/2
>>
>> How do you "know" that?
>
> Don't the Lisp integers use a bit for the type tag?

most-positive-fixnum is a variable defined in `data.c'.
Its value is 2305843009213693951

Andreas.

-- 
Andreas Schwab, address@hidden
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