Re: [PATCH] Pick rest argument values directly from the argvector without consing

[Jörg F . Wittenberger]

Thanks Peter for investing your time into this.

While I did not proof-read your code, my bet is that this kind of 
optimizations do add up at the end of the day.

On Oct 27 2019, Peter Bex wrote:

> On Sun, Oct 27, 2019 at 01:16:10PM +0100, Peter Bex wrote:
> > This super simple benchmark runs 25% faster with -O3:
> >
> > (define (foo #!optional (a 1) (b 2))
> >   (+ a b))
> >
> > (time
> >   (let lp ((i 0))
> >     (unless (= i 100000000)
> >       (foo 1 3)
> >       (lp (add1 i)))))
>
> I've tested some more, and the more rest arguments you add, the
> bigger the difference is (because more needs to be consed onto
> the stack).  With 4 arguments (which are all supplied in the call),
> it is 40% faster.  With 8 arguments it is 60% faster etc.
>
> Of course most procedures will only have a handful of rest arguments.

Likely. Though I've seen graphics code, which had a huge amount of keyword 
args. Will this change speed them up too?

> Cheers,
> Peter