Author: Matt Taylor
Date: 22:03:38 01/16/03
Go up one level in this thread
On January 16, 2003 at 13:07:53, Sander de Zoete wrote:
>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.
Go to http://developer.intel.com/ and search for "245471"
The title of the correct manual is "The IA-32 Intel® Architecture Software
Developer’s Manual, Volume 2: Instruction Set Reference"
-Matt
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