ec_point_is_at_infinity
mask = ~(0 - (ec_point_is_at_infinity(group, point) |
ec_point_is_at_infinity(group, point);
.point_is_at_infinity = ec_point_is_at_infinity,
.point_is_at_infinity = ec_point_is_at_infinity,
.point_is_at_infinity = ec_point_is_at_infinity,