#include "fe.h"

/*
    return 1 if f == 0
    return 0 if f != 0

    Preconditions:
       |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
*/

int fe_isnonzero(const fe f) {
    unsigned char s[32];
    unsigned char r;

    fe_tobytes(s, f);

    r = s[0];
    #define F(i) r |= s[i]
    F(1);
    F(2);
    F(3);
    F(4);
    F(5);
    F(6);
    F(7);
    F(8);
    F(9);
    F(10);
    F(11);
    F(12);
    F(13);
    F(14);
    F(15);
    F(16);
    F(17);
    F(18);
    F(19);
    F(20);
    F(21);
    F(22);
    F(23);
    F(24);
    F(25);
    F(26);
    F(27);
    F(28);
    F(29);
    F(30);
    F(31);
    #undef F

    return r != 0;
}