Re: Using the Intel's MMX Instruction Set in gcc3.2

[Ulrich Prakash <uprakash at npd dot hcltech dot com>]

Hi,

I tried this piece of code.

-----testmac.c-----------
#include <mmintrin.h>

int main()
{
   __m64 m1 = 12;
   __m64 m2 = 24;
 __m64 m3;

  asm ("pmaddwd m1,m2\n\t");

   m3 = m1;

   return;
}

and tried compiling using> gcc -mmmx testmac.c
I get the foll ERROR:
/tmp/cc0rnlnq.s: Assembler messages:
/tmp/cc0rnlnq.s:18: Error: too many memory references for `pmaddwd'

though i could find nothing wrong in usage of asm ("pmaddwd m1,m2\n\t");

Please help me if I am missing something.

Thanks,
Prakash.

At 02:06 PM 3/5/03 +0100, Andrea 'fwyzard' Bocci wrote:
> At 16.32 05/03/2003 +0530, Ulrich Prakash wrote:
> > Hi,
> >
> > I am using gcc version3.2,which supports the MMX Instruction Set.
> > Can anyone tell me how to use this Instruction Set in my C program?
> >
> > Is there a particular way that GCC provides to use the MMX Instruction 
> > Set directly?(If so,how?)
> > (OR)
> > Is it through an assembly function(.s file) in which I would have to use 
> > these Instruction Sets,and  which I would have to call in my C program?
>
> I don't recall now, I think there should be some intrinsics for that, or 
> whatever. Have a look into the GCC manual, looking for MMX.
>
> .fwyzard.