Function safe_add

numpy/core/src/common/npy_extint128.h:12–22

Integer addition with overflow checking */

/* Integer addition with overflow checking */
static inline npy_int64
safe_add(npy_int64 a, npy_int64 b, char *overflow_flag)
{
    if (a > 0 && b > NPY_MAX_INT64 - a) {
        *overflow_flag = 1;
    }
    else if (a < 0 && b < NPY_MIN_INT64 - a) {
        *overflow_flag = 1;
    }
    return a + b;
}


/* Integer subtraction with overflow checking */