By ref and by pointer kills performance.

[claptrap]

On Tuesday, 13 February 2024 at 06:02:47 UTC, Bruce Carneal wrote:
> On Tuesday, 13 February 2024 at 02:11:45 UTC, claptrap wrote:
>>
>
> To reuse the value the compiler would have to prove that the 
> memory locations do not overlap.  FORTRAN does not have this 
> problem, neither does ldc once you take responsibility for 
> non-overlap with the @restrict attribute as seen here:
>
> https://d.godbolt.org/z/z9vYndWqP
>
> When loops are involved between potentially overlapping indexed 
> arrays I've seen ldc go through the proof and do two versions 
> of the code with a branch.

Ah OK makes sense. The restrict attribute will help with what I'm 
doing.

thanks.