// A small overview of SIMD in .NET/C# / Habr
//https://habr.com/en/post/467689/
static unsafe void SimdAdd(byte[] a)
{
int simdLength = Vector256 <byte> .Count;
int lastIndex = a.Length - (a.Length % simdLength);
Vector256 <byte> v = new Vector256 <byte>();
int i;
fixed(byte *ptrA = a)
{
for (i = 0; i < lastIndex; i += simdLength)
{
var vv = Avx.LoadVector256(ptrA + i);
v = Avx2.Add(v, vv);
var inu = Avx2.ConvertToVector128Int32(ptrA + i);
var uma = Avx2.ConvertToVector256Int32(ptrA + i);
}
}
var neko = v.ToScalar();
int result = 0;
var temp = stackalloc byte[simdLength];
Avx.Store(temp, v);
for (int j = 0; j < simdLength; j++)
{
result += temp[j];
}
for (; i < a.Length; i++)
{
result += a[i];
}
}
public void RunBasicScenario()
{
TestLibrary.TestFramework.BeginScenario(nameof(RunBasicScenario));
SByte[] values = new SByte[ElementCount];
for (int i = 0; i < ElementCount; i++)
{
values[i] = TestLibrary.Generator.GetSByte();
}
Vector256<SByte> value = Vector256.Create(values[0], values[1], values[2], values[3], values[4], values[5], values[6], values[7], values[8], values[9], values[10], values[11], values[12], values[13], values[14], values[15], values[16], values[17], values[18], values[19], values[20], values[21], values[22], values[23], values[24], values[25], values[26], values[27], values[28], values[29], values[30], values[31]);
SByte result = value.ToScalar();
ValidateResult(result, values);
}
public void RunBasicScenario()
{
TestLibrary.TestFramework.BeginScenario(nameof(RunBasicScenario));
Int16[] values = new Int16[ElementCount];
for (int i = 0; i < ElementCount; i++)
{
values[i] = TestLibrary.Generator.GetInt16();
}
Vector256 <Int16> value = Vector256.Create(values[0], values[1], values[2], values[3], values[4], values[5], values[6], values[7], values[8], values[9], values[10], values[11], values[12], values[13], values[14], values[15]);
Int16 result = value.ToScalar();
ValidateResult(result, values);
}
public void RunBasicScenario()
{
TestLibrary.TestFramework.BeginScenario(nameof(RunBasicScenario));
Single[] values = new Single[ElementCount];
for (int i = 0; i < ElementCount; i++)
{
values[i] = TestLibrary.Generator.GetSingle();
}
Vector256 <Single> value = Vector256.Create(values[0], values[1], values[2], values[3], values[4], values[5], values[6], values[7]);
Single result = value.ToScalar();
ValidateResult(result, values);
}
public void RunBasicScenario()
{
TestLibrary.TestFramework.BeginScenario(nameof(RunBasicScenario));
Int64[] values = new Int64[ElementCount];
for (int i = 0; i < ElementCount; i++)
{
values[i] = TestLibrary.Generator.GetInt64();
}
Vector256 <Int64> value = Vector256.Create(values[0], values[1], values[2], values[3]);
Int64 result = value.ToScalar();
ValidateResult(result, values);
}
public static Vector256 <double> ToScalarVector256(Vector256 <double> vector)
{
return(Vector256.CreateScalar(vector.ToScalar()));
}
public static ulong Add4UInt64(this Vector256 <ulong> v)
{
v = Avx2.Add(v, Avx2.Permute4x64(v, 0b11_10_11_10));
v = Avx2.Add(v, Avx2.ShiftRightLogical128BitLane(v, 8));
return(v.ToScalar());
}