Can anyone please tell me how can I do loop unroll

```
void do_block (int lda, int M, int N, int K, double* A, double* B, double* C)
{
/* For each row i of A */
for (int i = 0; i < M; ++i)
/* For each column j of B */
for (int j = 0; j < N; ++j)
{
/* Compute C(i,j) */
double cij = C[i+j*lda];
for (int k = 0; k < K; ++k)
cij += A[i+k*lda] * B[k+j*lda];
C[i+j*lda] = cij;
}
}
```