start on SIMD documentation

[Iain Buclaw]

On 13 January 2012 19:18, Iain Buclaw <ibuclaw at ubuntu.com> wrote:
> On 13 January 2012 19:06, Peter Alexander <peter.alexander.au at gmail.com> 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.
>>
>
> This is probably intelligable, but makes sense to me.
>
> Change   int4  ->  v4si
>
> Vector names that reflect the MODE they represent, rather than the TYPE.
>

Unintelligible, even...


-- 
Iain Buclaw

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