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Re: [Emacs-diffs] trunk r117464: Shrink Lisp_Sub_Char_Table by preferrin

From: Stefan Monnier
Subject: Re: [Emacs-diffs] trunk r117464: Shrink Lisp_Sub_Char_Table by preferring C integers to Lisp_Objects.
Date: Thu, 03 Jul 2014 09:57:00 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

>> But the problem is that the code is vulnerable to these kinds
>> of changes.  Why do we even need to treat such a Lisp_Sub_Char_Table as
>> a Lisp_Vector at all?  I don't see any real need for it.
> This is somewhat similar to r110830 when we shrink struct vectorlike_header.

I'm not arguing against your optimization.  While I don't think it's
important, I'm perfectly happy if you work on such things.

But I don't see why that necessarily implies casting
Lisp_Sub_Char_Table to a Lisp_Vector (I ask this question without
having spent much time looking for the answer in the source, maybe the
answer is obvious, but I think if you can tell me why it's a better use
of my time than trying to figure it out myself).


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