Why I chose D over Ada and Eiffel

[John Colvin]

On Thursday, 22 August 2013 at 02:06:13 UTC, Tyler Jameson Little 
wrote:
> - array operations (int[] a; int[]b; auto c = a * b;)
>   - I don't think these are automagically SIMD'd, but there's 
> always hope =D

That isn't allowed. The memory for c must be pre-allocated, and 
the expression then becomes c[] = a[] * b[];

Is it SIMD'd?

It depends. There is a whole load of hand-written assembler for 
simple-ish expressions on builtin types, on x86. x86_64 is only 
supported with 32bit integer types because I haven't finished 
writing the rest yet...

However, I'm not inclined to do so at the moment as we need a 
complete overhaul of that system anyway as it's currently a 
monster*.  It needs to be re-implemented as a template 
instantiated by the compiler, using core.simd. Unfortunately it's 
not a priority for anyone right now AFAIK.


*
hand-written asm loops. If fully fleshed out there would be:
   ((aligned + unaligned + legacy mmx) * (x86 + x64) + fallback 
loop)
   * number of supported expressions * number of different types
of them. Then there's unrolling considerations. See 
druntime/src/rt/arrayInt.d