Re: maximum buffer size exceeded

[Giorgos Keramidas]

On Tue, 4 Sep 2007 16:48:46 +0200, Peter Dyballa <Peter_Dyballa@Web.DE> wrote:
>Am 04.09.2007 um 14:13 schrieb Giorgos Keramidas:
>> Are there plans to make the buffer size use one of the types
>> with "at least X bits", like uint32_t or uint64_t?  Do you
>> think there is a good reason *not* to do this (i.e. an absurd
>> performance penalty on some of the supported platforms)?
>
> Because of performance issues exactly these aligned data types
> are used – and a small part, those mentioned three bits, is
> reserved for Lisp, to record the Lisp type of the variable.

I got the reason why 3 bits are reserved, thanks :)

My question (which was probably phrased badly) was ``is there any
reason not to use uint64_t on all platforms?''.  The answer to
this may be ``Yes, there is.  Using uint64_t will unnecessarily
pessimize performance on 32-bit only systems'', or even ``Yes
there is.  Using uint64_t will make it impossible to build Emacs
with Foo C Compiler on Bar platform''.

I'm not acquainted with all the possible platforms or compiler
suites Emacs should normally build fine with, so that's why I
wondered :-)

- Giorgos