Loop unrolling

DuffsDevice.cs

static void DuffsDevice(uint count, int[] A, int[] B)
    {
        uint i = 0;
        uint n = (count + 7) / 8;
        switch (count % 8) {
            case 0: A[i] = B[i++]; goto case 7;
            case 7: A[i] = B[i++]; goto case 6;
            case 6: A[i] = B[i++]; goto case 5;
            case 5: A[i] = B[i++]; goto case 4;
            case 4: A[i] = B[i++]; goto case 3;
            case 3: A[i] = B[i++]; goto case 2;
            case 2: A[i] = B[i++]; goto case 1;
            case 1: A[i] = B[i++]; break;
        }
        while (--n > 0) {
            A[i] = B[i];
            A[i + 1] = B[i + 1];
            A[i + 2] = B[i + 2];
            A[i + 3] = B[i + 3];
            A[i + 4] = B[i + 4];
            A[i + 5] = B[i + 5];
            A[i + 6] = B[i + 6];
            A[i + 7] = B[i + 7];
            i += 8;
        }
    }