ADDEQU
ADDEQU(p[0], c, carry0);
ADDEQU(p[1], carry0, carry1);
ADDEQU(p[1], q[0], carry0);
ADDEQU(p[0], c, carry0);
ADDEQU(p[1], carry0, carry1);
ADDEQU(p[1], q[0], carry0);