Re: Knowing where a function has been used (bis) [Was: Re: Optimising Elisp code]

[Emanuel Berg]

Barry Margolin wrote:

>> If we are talking the insanely long
>> functions of Gnus, if the funcall overhead
>> is the reason for that, I don't see why
>> modularization plus inlining couldn't be one
>> puzzle piece of the remedy.
>
> If a function is "insanely long" then
> inlining will have negligible effect.
> Funcall overhead is only relevant if the
> function is really short, so it spends nearly
> as much time calling the function as doing
> the actual work of the function, AND you call
> the function frequently enough that this
> overhead adds up to something significant.

The insanely long functions would be shorter if
they, instead of doing one million things,
called other functions to help them with that.
This isn't done because it isn't fast enough.
But if inline works as you describe it, some of
that code could in fact be moved out of the
insanely long function, while still not slowing
it down with funcall overhead.


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