"Go to" one line before the declaration

[jessie....@rococoglobaltech.com]

Can somebody explain this code?

How is the cpu doing? better than for{} and select {} in CPU usage?

package main

func main() {

start:

    goto start

}

https://play.golang.org/p/BZ-yfDFLgV8

[Jan Mercl]

On Wed, Jul 17, 2019 at 11:24 AM <jessie....@rococoglobaltech.com> wrote:
>
> Can somebody explain this code?

> How is the cpu doing? better than for{} ...

Who claims it's doing better than `for {}`? IDK, I haven't tested, but
I guess it should perform the same bad way.

> ... and select {} in CPU usage?

Now that's a different story. Using `select {}` should burn 0% CPU in
the goroutine that executed the statement.

PS: Please post source code as black text on white, and, if possible,
as plain text only.

[fge...@gmail.com]

The question is rather vague, though after making a few assumption
here are some hopefully useful pointers:

You can compare the different generated code snippets if you use -S
during compilation:
go tool compile -S mytestfile.go

A Quick Guide to Go's Assembler: https://golang.org/doc/asm
The go compilers implement this specification: https://golang.org/ref/spec

(Similary to Jan, for code please use only links to play.golang.org,
that's enough.)

hth


On 7/17/19, jessie....@rococoglobaltech.com

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