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Re: pure-fns in byte-opt.el

From: Mark Oteiza
Subject: Re: pure-fns in byte-opt.el
Date: Sat, 29 Jul 2017 12:43:51 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> (let ((pure-fns
>> -       '(concat symbol-name regexp-opt regexp-quote string-to-syntax)))
>> +       '(concat symbol-name regexp-opt regexp-quote string-to-syntax
>> +         make-vector)))
> Ah, now that makes a lot more sense: make-vector is much less pure than
> string-to-char.  The above will cause the compiler to replace
>    (make-vector 2 ?a)
> with
>    [?a ?a]
> so you end with a single immediate vector being re-used over and over,
> instead of having a new vector created each time.

But reading a literal vector still generates a new vector, no?

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