Today when I was in computer organization class, teacher talked about something interesting to me. When it comes to talk about Why cache memory works, he said that:

for (i=0; i<M; i++)
   for(j=0; j<N; j++)
      X[i][j] = X[i][j] + K; //X is double(8 bytes)

it is not good to change the first line with the second. What is your opinions on this? And why it is like that?

c caching optimization cpu-architecture
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