SseUnpackPerformance.cs

class UnpackTest
{
	byte[] _source;
	byte[] _target;
	
	public UnpackTest()
	{
		int size = 1000 * Vector128<byte>.Count;
		var source = new byte[size];
		var target = new byte[size * 2];
		new Random(0).NextBytes(source);
		
		_source = source;
		_target = target;
	}

	unsafe void TestA()
	{
		var length = _source.Length;
		fixed (byte* s0 = _source)
		fixed (byte* t0 = _target)
		{
			var s = s0;
			var t = t0;
			var l = s + length;
			while (s < l)
			{
				UnpackA(s, t);
				s += 16;
				t += 32;
			}
		}
	}

	unsafe void TestB()
	{
		var length = _source.Length;
		fixed (byte* s0 = _source)
		fixed (byte* t0 = _target)
		{
			var s = s0;
			var t = t0;
			var l = s + length;
			var z = Vector128<byte>.Zero;
			while (s < l)
			{
				UnpackB(s, t, z);
				s += 16;
				t += 32;
			}
		}
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	static unsafe void UnpackA(byte* source, byte* target)
	{
		var vector = Sse2.LoadVector128(source);
		Sse2.Store(target + 0x00, Sse2.UnpackLow(vector, Vector128<byte>.Zero));
		Sse2.Store(target + 0x10, Sse2.UnpackHigh(vector, Vector128<byte>.Zero));
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	static unsafe void UnpackB(byte* source, byte* target, Vector128<byte> zero)
	{
		var vector = Sse2.LoadVector128(source);
		Sse2.Store(target + 0x00, Sse2.UnpackLow(vector, zero));
		Sse2.Store(target + 0x10, Sse2.UnpackHigh(vector, zero));
	}
}