In something as simple as

int sq(int x) { int y = x*x; return y; }

versus

int sq(int x) { return (x*x); }

the former function requires an extra IL step.

Is that IL extra step indicative of data being copied in memory? Is this difference still present when using something seemingly better optimized? (C?)

If yes to first or both: can I use the latter, especially when the returned data takes a lot of space, and presumably a lot of time to be moved in memory? Or should I favor the former, because it is more readable? LINQ makes it easy to have whole functions inside a long return() line, but my example faces the same choice were it C. Speed or readability?

In general, would you put the last bit of maths between the parentheses in the return line?

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