fp_pow
ATTRIBUTE_WARN_UNUSED_RET int fp_pow(fp_t out, fp_src_t base, nn_src_t exp);
GENERIC_TEST_FP(fp_pow, FP_POW, "exp", fp_pow, "cffn", "ioii",
ret = fp_pow(&fp_tmp1, &fp_tmp1, &nn_tmp); EG(ret, err);
ret = fp_pow(sqrt1, _n, &tmp_nn); EG(ret, err);
ret = fp_pow(&c, &z, &q); EG(ret, err);
ret = fp_pow(&r, _n, &tmp_nn); EG(ret, err);
ret = fp_pow(&t, _n, &q); EG(ret, err);
ret = fp_pow(&pow, a, &exp); EG(ret, err);