Hilarious [Or Not So Hilarious] Code Optimizations

Question

Raymond Chen has this to say on his recent post on code optimizations... Obvious optimizations - one that begs to be optimized - tend to be \"de-optimizations\" if you conside

Answer 1

My favourite is

// original code
int a[10];
a[5] = 3;

// optimized code
int a[10];
*(a + 5) = 3;

Yes, all of a sudden, that's magically faster!!