macOS Catalina(apple.com)

  defaults write com.apple.sidecar.display allowAllDevices -bool YES

    // Equal to 0x80000000 on ILP32
    // Undefined behavior on LP64 / LLP64
    size_t max = 1u << (sizeof(size_t) * CHAR_BIT - 1);

    // Correct version
    size_t max = (size_t)1 << (sizeof(size_t) * CHAR_BIT - 1);

    #define K 1024
    #define M (1024 * K)
    #define G (1024 * M)
    #define T (1024 * G)
    // Undefined behavior, on both 32-bit and 64-bit.
    size_t max_object_size = 10 * T;
    // Correct version (#1)
    size_t max_object_size = 10995116277760;
    // Correct version (#2)
    static const size_t K = 1024;
    static const size_t M = 1024 * M;
    ... etc ...

    void *align_ptr(void *p) {
        // Mask is 0xfffffff0 on 32-bit (correct)
        // Is also 0xfffffff0 on 64-bit (mistake)
        return (void *)(((uintptr_t)p + 0xf) & ~0xf);
        // Correct version
        return (void *)(((uintptr_t)p + 0xf) & ~(uintptr_t)0xf);
    }