Function npy_bswap8

numpy/core/src/common/lowlevel_strided_loops.h:517–532

}

static inline npy_uint64
npy_bswap8(npy_uint64 x)
{
#ifdef HAVE___BUILTIN_BSWAP64
    return __builtin_bswap64(x);
#else
    return ((x & 0xffULL) << 56) |
           ((x & 0xff00ULL) << 40) |
           ((x & 0xff0000ULL) << 24) |
           ((x & 0xff000000ULL) << 8) |
           ((x & 0xff00000000ULL) >> 8) |
           ((x & 0xff0000000000ULL) >> 24) |
           ((x & 0xff000000000000ULL) >> 40) |
           ( x >> 56);
#endif
}

static inline void
npy_bswap8_unaligned(char * x)