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Re: [RFC] temporary Lisp_Strings

From: Stefan Monnier
Subject: Re: [RFC] temporary Lisp_Strings
Date: Tue, 02 Sep 2014 10:00:15 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> I'm thinking about temporary Lisp_Strings on C stack (allocated with alloca).
> Simple implementation (with no check whether it fits on stack) and a few use
> cases attached.  Among others, the question is: is there a way to make sure
> that an address returned by alloca fits in Lisp_Object?

Have you made some preliminary measurements (on microbenchmarks) to try
and see how much speed up we might gain?  Given the cost of strlen and
parse_str_as_multibyte, I'd expect that the best-case benefit might turn
out to be rather small.


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