SIMD

[Wyverex]

Don wrote:
> Wyverex wrote:
>> Was messing around with SIMD, SSE stuff..  didn't know how much faster 
>> it could be!  Its been a few years since I did any assembly.
>> Though Id just share this, any word of adding this to the lib or 
>> compiler optimizations for this?
>>
>>
>> my results:
>> Parallel     Single
>>
>> SQRTPS:0.000120  FSQRT:0.001021
>> SQRTPS:0.000114  FSQRT:0.001026
>> SQRTPS:0.000114  FSQRT:0.001021
>> SQRTPS:0.000114  FSQRT:0.001026
>>
>>
>> codepad if you wish to play with it..
>> http://codepad.org/oqq5jsbJ
>>
>> ...times from codepad
>> SQRTPS:0.000291  FSQRT:0.000634
>> SQRTPS:0.000289  FSQRT:0.000632
> 
>>   asm
>>   {
>>     mov EAX, [pa];
>>     mov EBX, [pb];
>>     mov ECX, times; //error on a.length
>>
>>   REP2:
>>     fldpi float ptr[EAX];
> 
> shouldn't that be fld ?
> fldpi loads 3.1415.... !
> Doesn't make any difference to the time, though.
> 
> This is exactly why D just got array operations.

i had  fld  first but sqrt of 5 or higher came back as -nan....