Re: Mixing mmix and C code?

On 11 Oct 2006, Tommy Thorn wrote:


> Luciano wrote:
> > I am intersted in the mmix language by Donald Knuth. Is there a way
> > to call to routine that I write in mmix from C, or is there an mmix to
> > C converter?
> >
> > Thanks
> > Luciano
> > [I see that Knuth has an mmix interpreter written in C. Perhaps you
> > can modify that to make it a callable library. -John]
>
> Luciano, the question is a bit unclear. First, MMIX is strictly
> speaking not a language, but a microprocessor architeture. Most
> likely, you do not want to be writing in the binary code that is the
> machine code language of MMIX.
>
> If you're using the mmix-gcc and wish to mix assembly to C code, then
> that's completely standard. You can either inline assembly with the
> usual asm() syntax, eg. asm("ADDI $2,$5,8") or write an complete
> assembly file and with with that.
>
> If you wish to instrument the simulator (as John implies), then it is
> not that hard at all to modify the MMIX simulator. However, if you need
> access to all of MMIX (notably the priviledge instructions) then you
> need to modify the pipeline simulator MMMIX, which is a non-trivial
> exercise.


Thanks a lot, first!


I try to reformulate my wish better:
How do I code an MMIX example program in such a way that it becomes a
subroutine inside a C-language program?
That is, is it possible to do something like this


int fatt(int);
main (){
int i,j;
i=2;
j=fatt(i);
printf ("fatt(%d)=%d\n",i,j);
}
int fatt (int){
/* here I write the code
possibly taken from Knuth's books
     with little extra converting effort
*/
}


Luciano
ps.
I use Linux :-)
[It's not going to be easy. You'll have to figure out some way to
package up the MMIX simulator as a callable routine or library. My
suggestion is don't do that, back up a step, and tell us what you are
trying to accomplish. -John]

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