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

[Peter Bex]

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.

Cheers,
Peter

signature.asc
Description: PGP signature