public static unsafe IntPtr ScanPatternAVX2(byte* pBase, int size, byte targetByte) {
    Vector256<byte> target = Vector256.Create(targetByte);
    for (int i = 0; i < size - 32; i += 32) {
        Vector256<byte> chunk = Avx2.LoadVector256(pBase + i);
        Vector256<byte> cmp = Avx2.CompareEqual(chunk, target);
        int mask = Avx2.MoveMask(cmp);
        if (mask != 0) {
            int bit = System.Numerics.BitOperations.TrailingZeroCount((uint)mask);
            return (IntPtr)(pBase + i + bit);
        }
    }
    return IntPtr.Zero;
}