I ran into this question when i was answering another guys question. How do compilers optimize the code? Can keywords like const, … help? Beside the fact with volatiles and inline functions and how to optimize the code all by your self!
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I ran into this question when i was answering another guys question. How do compilers optimize the code? Can keywords like const, … help? Beside the fact with volatiles and inline functions and how to optimize the code all by your self!
Compilers are free to optimize code so long as they can guarantee the semantics of the code are not changed.
I would suggestion starting at the Compiler optimization wikipedia page as there are many different kinds of optimization that are performed at many different stages.
As you can see, modern compilers are very ‘smart’ at optimizing code (compiled C code is often faster than hand-written assembly unless the programmer really knows how to take advantage of all the specific processor instructions and quirks). As others have said, write for clarity first based on a good design.