Author: Sander de Zoete
Date: 10:07:53 01/16/03
Go up one level in this thread
On January 15, 2003 at 02:41:38, Matt Taylor wrote:
>On January 14, 2003 at 19:23:38, Sander de Zoete wrote:
>
>>Thanks Gerd,
>>
>>I also did some searching myself on the web. I ended up with a website where
>>SIMD was explained together with MMX,SSE,MAJC, etc. Then I also managed to
>>download the instruction sets from all these processor technologies. Can I use
>>these like this in Cplusplus (Borland)
>>
>>I really see a lot of potential here.
>>
>>// Put BITBOARD a into MMX
>>void SetBitboardIntoMMX(BITBOARD a, unsigned int b)
>>{
>> asm
>> {
>> movq a
>>
>> }
>> // Shift a with value b to the right
>> asm
>> {
>> psrlw a, b
>>
>> }
>>}
>>Will something like this work?
>>
>>In an example a was represented by mm5 (probably the 6th memory space in MMX
>>(mm0 - mm7 if I recall correctly). How do I know what is in mm5?
>>
>>Sander.
>
>mm5 works exactly like a variable. How do you know what a and b are until you
>set them? Same thing for mm5 -- you have to initialize it with a movd or movq
>instruction. As for the significance of mm5, its significance is defined by you.
>If you put a in mm5, mm5 becomes a. If you put b in mm5, it becomes b.
>
>Note that you probably want to coalesce your statements like this:
>
>asm
>{
> movq a
> psrlw a, b
>}
>
>The syntax of the instructions is always going to look like this:
>
>operation dest, src
>
>By the way, Intel manual 245471-6 makes a very good reference.
>
Thank you Matt
Where on the web can I find this manual?
Sander.
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