mipscop-2.c

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

register unsigned int c3r1 asm ("$c3r1");

extern unsigned int b, c;

void
foo ()
{
  unsigned int a, d;

  c3r1 = a;
  b = c3r1;

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