public static int SIMDSum(this ReadOnlySpan <int> array)
{
int length = Vector <int> .Count * 32;
int vectorizedLength = (array.Length / length) * length;
Span <int> temp = stackalloc int[length];
int result = 0;
for (int i = 0; i < vectorizedLength; i += length)
{
temp.AddAssign(array.Slice(i, length));
}
for (int i = 0; i < length; i++)
{
result += temp[i];
}
for (int i = vectorizedLength; i < array.Length; i++)
{
result += array[i];
}
return(result);
}