It gives a different result for -0: https://go.dev/play/p/LAVIaAZsVNi
Also, the math.Abs implementation is branch-less. Depending on what the
compiler makes of either, that might perform better.
On Sat, 19 Oct 2024 at 16:28, Diego Augusto Molina <
diegoaugustomol...@gmail.com> wrote:
> Hi! I wanted to ask what is the difference between the current
> implementation of math.Abs and the following:
>
> ```go
> func Abs(x float64) float64 {
> if x < 0 {
> return -x
> }
> return x
> }
> ```
>
> math.Abs would appear to return a copy of the input with the sign bit set
> to zero. I tried the special conditions of NaN (the one returned by
> math.NaN()), +Inf, and -Inf and the above would appear to work the same.
>
> I guess my main question is: would "-x" behave differently under any
> condition? Was there a particular motivation for the current
> implementation? Not judging nor asking for any change, just trying to learn.
>
> Thank you!
>
> --
> You received this message because you are subscribed to the Google Groups
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to golang-nuts+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/golang-nuts/0cffdc6f-65c3-45c1-b003-ef3c27a0542en%40googlegroups.com
> <https://groups.google.com/d/msgid/golang-nuts/0cffdc6f-65c3-45c1-b003-ef3c27a0542en%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/golang-nuts/CAEkBMfHANuTXzXuJC_7jS%3DyL4M9iY95H1ctXhueHQJyHt71-hg%40mail.gmail.com.
