private sbyte[] Calculate(sbyte[] inputSignal, sbyte[] pattern, int digitsToSkip, sbyte[] output = null)
{
output ??= new sbyte[inputSignal.Length];
//for (int i = 0; i < inputSignal.Length; i++)
Parallel.For(0, inputSignal.Length, i =>
{
var iterationPattern = new RepeatingDigits(pattern, i + 1);
int sum = 0;
for (int j = 0; j < inputSignal.Length; j++)
{
var a = inputSignal[j];
var b = iterationPattern[j + digitsToSkip];
sum += a * b;
}
var onesDigit = (sbyte)new IndexableNumber(sum)[0]; // only keep the position in the 1s place
output[i] = onesDigit;
}
);
//Console.WriteLine();
//Console.WriteLine(string.Join("", output));
return(output);
}
// same function as the old one above, but uses iterators, no arrays, and no linq
private sbyte[] Calculate(sbyte[] inputSignal, sbyte[] pattern, int digitsToSkip, sbyte[] output = null)
{
output ??= new sbyte[inputSignal.Length];
//for (int i = 0; i < inputSignal.Length; i++)
Parallel.For(0, inputSignal.Length, i =>
{
var iterationPattern = new RepeatingDigits(pattern, i + 1);
//int sum = 0;
//for (int j = 0; j < inputSignal.Length; j++)
//{
// var a = inputSignal[j];
// var b = iterationPattern[j + digitsToSkip];
// sum += a * b;
//}
//var onesDigita = (sbyte)new IndexableNumber(sum)[0]; // only keep the position in the 1s place
// simd
var offset = Vector <sbyte> .Count;
var muls = new sbyte[offset];
var sumd = Vector <sbyte> .Zero;
int k = 0;
if (offset < inputSignal.Length)
{
for (; k < inputSignal.Length - offset; k += offset)
{
// populate the muls
for (int m = 0; m < offset; m++)
{
muls[m] = iterationPattern[k + m + digitsToSkip];
}
var v1 = new Vector <sbyte>(inputSignal, k);
var v2 = new Vector <sbyte>(muls);
sumd += v1 * v2;
}
}
int total = 0;
for (int t = 0; t < offset; t++)
{
total += sumd[t];
}
for (; k < inputSignal.Length; k++)
{
total += (inputSignal[k] * iterationPattern[k + digitsToSkip]);
}
var onesDigit = (sbyte)new IndexableNumber(total)[0]; // only keep the position in the 1s place
output[i] = onesDigit;
//Debug.Assert(onesDigita == onesDigit);
}
);
//Console.WriteLine();
//Console.WriteLine(string.Join("", output));
return(output);
}