fp_nonzero.cu

// bls12_381: Arithmetic for BLS12-381
// Copyright 2022 Dag Arne Osvik

#include "fp.cuh"

/**
 * @brief Check if the reduced input x is different from zero
 *
 * @param [in] x
 * @return bool 1 if true, zero otherwise.
 */
__device__ bool fp_nonzero(const fp_t &x) {
    fp_t t;
    fp_cpy(t, x);
    fp_reduce6(t);

    return (t[5] | t[4] | t[3] | t[2] | t[1] | t[0]) != 0;
}

// vim: ts=4 et sw=4 si