start on SIMD documentation

[Martin Nowak]

On Sun, 15 Jan 2012 06:21:22 +0100, Walter Bright  
<newshound2 at digitalmars.com> wrote:

> On 1/14/2012 9:15 PM, Sean Cavanaugh wrote:
>> What about the 256 bit types that are already present in AVX  
>> instruction set?
>
> Eventually, I'd like to do them, too.
>
I already did some work for adding AVX to the inline assembler.
https://github.com/dawgfoto/dmd/commits/AVXSupport