mp_count_bits
norm = mp_count_bits(&y) % DIGIT_BIT;
if ((res = mp_2expt(&tmp, mp_count_bits(a))) != MP_OKAY) {
p = mp_count_bits(n);
x = mp_count_bits(X);
iy = mp_count_bits(a);
p = mp_count_bits(a);
p = mp_count_bits(n);
bits = mp_count_bits(b) % DIGIT_BIT;
int size = mp_count_bits(a);
*size = mp_count_bits(a) + (a->sign == MP_NEG ? 1 : 0) + 1;
return mp_count_bits(a);