Any usable SIMD implementation?

[Johan Engelen via Digitalmars-d]

On Tuesday, 5 April 2016 at 21:29:41 UTC, Walter Bright wrote:
> 
> I want to make it clear that dmd does not generate AFX specific 
> code, has no switch to enable AFX code generation and has no 
> basis for setting predefined version identifiers for it.

How about adding a "__target(...)" compile-time function, that 
would return false if the compiler doesn't know?

__target("broadwell")  --> true means: target cpu is broadwell, 
false means compiler doesn't know or target cpu is not broadwell.

Would that work for all?