[Cuis-dev] Why is this slower?

[Hernán Wilkinson]

I think @Eliot Miranda <eliot.miranda at gmail.com> is the right person to
answer :-)

On Sun, May 24, 2026 at 8:32 AM Luciano Notarfrancesco via Cuis-dev <
cuis-dev at lists.cuis.st> wrote:

> I have a class that implements a one pole filter, with instance variables
> pole and y (the last output). It implements
>
> value: in
>     ^ y := (1.0 - pole) * in + (pole * y)
>
> The following implementation is equivalent, but uses one less arithmetic
> operation:
>
> value: in
>     ^ y := (y - in) * pole + in
>
> I was surprised to find out that the second implementation is 35% slower
> (measured with BlockClosure>>bench). From just looking at the bytecodes
> naively, it looks like a "pushTemp: 0" is much slower than a
> "pushRcvr: 0" + a "pushConstant: 1.0" + "send: *". Anyone know what's
> exactly going on? Is there an easy way to print the generated native code?
> I'm just curious, not a big deal.
>
> Thanks,
> Luciano
> --
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>


-- 

*Hernán WilkinsonAgile Software Development, Teaching & Coaching*
*Phone: +54-011*-4893-2057
*Twitter: @HernanWilkinson*
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