Any usable SIMD implementation?

[Walter Bright via Digitalmars-d]

On 4/5/2016 2:39 AM, 9il wrote:
> On Tuesday, 5 April 2016 at 08:34:32 UTC, Walter Bright wrote:
>> On 4/4/2016 11:10 PM, 9il wrote:
>> I still don't understand why you cannot just set '-version=xxx' on the command
>> line and then switch off that version in your custom code.
>
> I can do it, however I would like to get this information from compiler. Why?
>
> 1. This would help to eliminate configuration bugs.
> 2. This would reduce work for users and simplified user experience.
> 3. This is possible and not very hard to implement if I am not wrong.


Where does the compiler get the information that it should compile for, say, AFX?