Thank you for the responses. Unfortunately, they all comment on the given
use case.
The real question is if we should add a function in math/bits that performs
the operation.
The function would be
func notZero(x int) int {
if x == 0 {
return 0
}
return 1
}
Regarding code optimization, do they also optimize range testing ?
if x >= a && x <= b ...
can be translated into the following when b > a.
if uint(x - a) <= uint(b-a) ...
This replaces two conditional branches with one. I checked go assembly and
the later is indeed simpler.
I benchmarked decode rune with both and didn't see much difference. This is
probably because in a tight loop of benchmark tests, the branching
prediction does well its job.
Le samedi 21 novembre 2020 à 10:30:13 UTC+1, b.ca...@pobox.com a écrit :
> That's fantastic. Paste in
>
> int Test0(int v, int v1, int v2, int v3)
> {
> return v == v1 || v == v2 || v == v3;
> }
>
> and then the the compiler options to -O3.
>
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