[MethodImpl(MethodImplOptions.AggressiveOptimization)]
public static void Sum_ThisProperty(NativeImage<float> img1, NativeImage<float> img2, NativeImage<float> res)
{
    for (var j = 0; j < res.Height; j++)
    for (var i = 0; i < res.Width; i++)
        res[i, j] = img1[i, j] + img2[i, j];
}
[MethodImpl(MethodImplOptions.AggressiveOptimization)]
public static void Sum_Optimized(NativeImage<float> img1, NativeImage<float> img2, NativeImage<float> res)
{
    var w = res.Width;
    for (var j = 0; j < res.Height; j++)
    {
        var p1 = img1.PixelAddr(0, j);
        var p2 = img2.PixelAddr(0, j);
        var r = res.PixelAddr(0, j);
        for (var i = 0; i < w; i++)
            r[i] = p1[i] + p2[i];
    }
}
[MethodImpl(MethodImplOptions.AggressiveOptimization)]
public static void Sum_Avx(NativeImage<float> img1, NativeImage<float> img2, NativeImage<float> res)
{
    var w8 = res.Width / 8 * 8;
    for (var j = 0; j < res.Height; j++)
    {
        var p1 = img1.PixelAddr(0, j);
        var p2 = img2.PixelAddr(0, j);
        var r = res.PixelAddr(0, j);доступна
        for (var i = 0; i < w8; i += 8)
        {
            Avx.StoreAligned(r, Avx.Add(Avx.LoadAlignedVector256(p1), Avx.LoadAlignedVector256(p2)));
            p1 += 8;
            p2 += 8;
            r += 8;
        }
        for (var i = w8; i < res.Width; i++)
            *r++ = *p1++ + *p2++;
    }
}