mipscop-4.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

register unsigned long c3r1 asm ("$c3r1"), c3r2 asm ("$c3r2");

extern unsigned long b, c;

void
foo ()
{
  unsigned long a, d;

  c3r1 = a;
  b = c3r1;

  c3r2 = c;
  d = c3r1;
  printf ("%d\n", d);
}