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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: Wed, 02 Jul 2014 14:27:23 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

>> if/when we optimize the representation a bit more (i.e. merge `depth'
>> and `min_char' into a single 32bit word, by adding ":2" and ":30"
>> after each field), your code will probably fail.
> I've considered this possible optimization too and rejected it exactly
> for the reason you're talking about.

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.


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