Re: What's missing in ELisp that makes people want to use cl-lib?

[Michael Heerdegen]

João Távora <joaotavora@gmail.com> writes:

> But this one stands out.  I hope you can read this macro more or less.
>
>    (joaot/with-benchmark-group "destructuring"
>      ((list1 . (make-list 3 0)))
>      100000
>      (joaot/bench (pcase-let ((`(,a ,b ,c) list1)) (+ a b c)))
>      (joaot/bench (cl-destructuring-bind (a b c) list1 (+ a b c)))
>      (joaot/bench (seq-let (a b c) list1 (+ a b c))))
>
> Running in Emacs -Q:
>
>   ("destructuring"
>     (cl-destructuring-bind "FASTEST" 0.010702393 0 0.0)
>     (pcase-let "1.3x SLOWER" 0.014360937999999998 0 0.0)
>     (seq-let "3.5x (rel 2.6x) SLOWER" 0.03706726 0 0.0))
>
> Where after loading m6sparse.el we go to this:
>
>   (("destructuring" (cl-destructuring-bind "FASTEST" 0.010157632 0 0.0)
>     (pcase-let "1.3x SLOWER" 0.013152518000000002 0 0.0)
>     (seq-let "14.8x (rel 11.4x) SLOWER" 0.15057331499999999
>       6 0.04785139399999849))

Isn't seq-let directly translated into a pcase-let call (it's a
simplistic macro)?  How is this possible?

Michael.