Standard way to supply hints to branches

[Daniel N]

On Thursday, 29 August 2024 at 18:28:04 UTC, Walter Bright wrote:
> On 8/28/2024 2:45 AM, Manu wrote:
>> Here's one that I just wrote a short while ago:
>> https://gist.github.com/TurkeyMan/0e49da245cc0086f852ac18deed21a9c
>
>
> ```
> if (data.length < 4) // unlikely
>     return 0;
> ```
>
> replace with:
>
> ```
> if (data.length < 4)
>     goto Lreturn0;
> ```

This seldom works.
onlineapp.d(4): Error: `goto` skips declaration of variable 
`onlineapp.fun.y`
onlineapp.d(6):        declared here

```
int fun(int x)
{
     if (x < 0)
         goto Lreturn0;

     int y = x * x;

     return y;
Lreturn0:
     return 0;
}
```