start on SIMD documentation

[Peter Alexander]

On 13/01/12 7:06 PM, Peter Alexander wrote:
> On 13/01/12 8:39 AM, Walter Bright wrote:
>> https://github.com/D-Programming-Language/d-programming-language.org/blob/master/simd.dd
>>
>>
>>
>> and core.simd:
>>
>> https://github.com/D-Programming-Language/druntime/blob/master/src/core/simd.d
>>
>>
>
> Nice!
>
> Although...
>
> import core.simd;
> void main()
> {
> float4 a = void; // float a; doesn't work either
> a = simd(XMM.PXOR, a);
> }
>
> *** Internal error: backend/cgcod.c 2048 ***
>
> Are all those instructions implemented? I seem to get the same for all
> instructions.
>
> Also, slight bikeshedding issue: I'm not so sure on using names like
> int4 for vectors. You see things like int32 a lot to mean a 32-bit
> integer, or int8 to mean an 8-bit integer. Using this notation for
> vectors may be confusing.
>
> As for what to change it to, I don't really care. int4v, vec_int4,
> int_vector4, anything. It doesn't matter.
>

Sorry, the code was meant to be:

import core.simd;
void main()
{
     float4 a = void;
     a = simd(XMM.PXOR, a, a);
}

The error was for this code.