start on SIMD documentation

[Andrei Alexandrescu]

On 1/13/12 10:03 PM, Walter Bright wrote:
> On 1/13/2012 7:03 PM, Andrei Alexandrescu wrote:
>> How is that possibly different from what you have now?
>
> Intrinsic functions are today just a table lookup in the compiler.

They're a table lookup if the operation is a compile-time constant. So 
this argument does not apply.

> Template intrinsics currently do not exist, so more code needs to be
> written for them.

The same table lookup could be done, except in this case it would be 
more principled.


Andrei