By ref and by pointer kills performance.

[jmh530]

On Tuesday, 13 February 2024 at 15:40:23 UTC, jmh530 wrote:
> On Tuesday, 13 February 2024 at 06:02:47 UTC, Bruce Carneal 
> wrote:
>> [...]
>
> As a heads up, the LDC wiki page doesn't have restrict on it.
>
> https://wiki.dlang.org/LDC-specific_language_changes
>
> Does LDC's @restrict only work with pointers directly and not 
> slices? `fillRestricted2` doesn't compile (it only fails 
> because `value` is a slice, not because `dest` is one. But 
> `fillRestricted3` compiles just fine.
>
> ```d
> void fillRestricted2(@restrict uint[] value, uint[] dest)
> {
>     dest[0] = value[0];
>     dest[1] = value[1];
>     dest[2] = value[2];
>     dest[3] = value[3];
> }
>
> void fillRestricted3(@restrict uint* value, uint[] dest)
> {
>     dest[0] = value[0];
>     dest[1] = value[1];
>     dest[2] = value[2];
>     dest[3] = value[3];
> }
>
> ```

Sorry, I should note that while `fillRestricted3` compiles, It 
has similar codegen as `fillBP`.