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Re: Is Elisp really that slow?

From: Emanuel Berg
Subject: Re: Is Elisp really that slow?
Date: Mon, 13 May 2019 16:33:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Stefan Monnier wrote:

>> can this be sped up?
>>                (while (re-search-forward from nil t)
>>                  (replace-match to t))
> That's a perfect example where no matter how
> many man-years you invest into a super-duper
> fancy compiler for Elisp, the above code will
> not be affected one bit, because all the time
> is normally spent within `re-search-forward`
> and `replace-match` which are already
> implemented in C.

Wait, if so, isn't this the solution to the
whole problem?

1) Identify what is slow in Elisp.

2) Rewrite it in C?

What am I missing?

Is there some things that are slow _and_ cannot
easily be rewritten in C?

Or is there an Elisp-to-C transition penalty?

underground experts united

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