read_gc0_index
o_index = read_gc0_index();
index = read_gc0_index();
old_index = read_gc0_index();
old_index = read_gc0_index();
old_index = read_gc0_index();
int idx = read_gc0_index();
int idx = read_gc0_index();
*v = (long)read_gc0_index();