N-body bench

[bearophile]

Stanislav Blinov:

> I meant how to make it compile with ldc2? I've translated the 
> code, it compiles and works with dmd (although segfaults in 
> -release mode for some reason, probably a bug somewhere).
>
> But with ldc2:
>
> nbody.d(68): Error: undefined identifier __simd
> nbody.d(68): Error: undefined identifier XMM
>
> those are needed for that sqrt reciprocal call.

Usually for me ldc2 works with simd. Perhaps you have to show us 
the code, ask for help in the ldc newsgoup, or ask for help in 
the #ldc IRC channel.

Regarding dmd with -release, I suggest you to minimize the code 
and put the problem in Bugzilla. Benchmarks are also useful to 
find and fix compiler bugs.

Bye,
bearophile