284     if (BN_is_zero(a)) {  in ec_GFp_simple_group_check_discriminant()
285         if (BN_is_zero(b))  in ec_GFp_simple_group_check_discriminant()
287     } else if (!BN_is_zero(b)) {  in ec_GFp_simple_group_check_discriminant()
304         if (BN_is_zero(a))  in ec_GFp_simple_group_check_discriminant()
706     if (BN_is_zero(n5)) {  in ec_GFp_simple_add()
707         if (BN_is_zero(n6)) {  in ec_GFp_simple_add()
938     if (EC_POINT_is_at_infinity(group, point) || BN_is_zero(point->Y))  in ec_GFp_simple_invert()
947     return BN_is_zero(point->Z);  in ec_GFp_simple_is_at_infinity()
1238     if (!BN_is_zero(points[0]->Z)) {  in ec_GFp_simple_points_make_affine()
1252         if (!BN_is_zero(points[i]->Z)) {  in ec_GFp_simple_points_make_affine()
1289         if (!BN_is_zero(points[i]->Z)) {  in ec_GFp_simple_points_make_affine()
1308     if (!BN_is_zero(points[0]->Z)) {  in ec_GFp_simple_points_make_affine()
1319         if (!BN_is_zero(p->Z)) {  in ec_GFp_simple_points_make_affine()
1394     } while (BN_is_zero(e));  in ec_GFp_simple_field_inv()
1451     } while (BN_is_zero(lambda));  in ec_GFp_simple_blind_coordinates()
1517     } while (BN_is_zero(r->Y));  in ec_GFp_simple_ladder_pre()
1523     } while (BN_is_zero(s->Z));  in ec_GFp_simple_ladder_pre()
1651     if (BN_is_zero(r->Z))  in ec_GFp_simple_ladder_post()
1654     if (BN_is_zero(s->Z)) {  in ec_GFp_simple_ladder_post()