Function sz_move_serial

include/stringzilla/memory.h:348–372

}

SZ_PUBLIC void sz_move_serial(sz_ptr_t target, sz_cptr_t source, sz_size_t length) {
    // Implementing `memmove` is trickier, than `memcpy`, as the ranges may overlap.
    // Existing implementations often have two passes, in normal and reversed order,
    // depending on the relation of `target` and `source` addresses.
    // https://student.cs.uwaterloo.ca/~cs350/common/os161-src-html/doxygen/html/memmove_8c_source.html
    // https://marmota.medium.com/c-language-making-memmove-def8792bb8d5
    //
    // We can use the `memcpy` like left-to-right pass if we know that the `target` is before `source`.
    // Or if we know that they don't intersect! In that case the traversal order is irrelevant,
    // but older CPUs may predict and fetch forward-passes better.
    if (target < source || target >= source + length) {
#if SZ_USE_MISALIGNED_LOADS
        while (length >= 8) *(sz_u64_t *)target = *(sz_u64_t const *)(source), target += 8, source += 8, length -= 8;
#endif
        while (length--) *(target++) = *(source++);
    }
    else {
        // Jump to the end and walk backwards.
        target += length, source += length;
#if SZ_USE_MISALIGNED_LOADS
        while (length >= 8) *(sz_u64_t *)(target -= 8) = *(sz_u64_t const *)(source -= 8), length -= 8;
#endif
        while (length--) *(--target) = *(--source);
    }
}

#pragma endregion