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I would like to know all the possible ways (or atleast the popular ones) in which compilers can/do optimize away our code written in C++? I also would like to know how exactly the optimization is done (in each case)!
So far, I’m aware of two optimizations, viz. Empty Base Optimization (EBO) and Return Value Optimization (RVO). What else are there? I’ve heard of “const” optimization,”unused variable” optimization. What are they?
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Incredibly broad, because there are many optimizations and compiler writers are always thinking up more. There are tons of them, some optimizing for run time, others optimizing for binary size. Many aren’t specifically C++ either, the general compiler optimization techniques are implemented for many compilers/interpreters for many different languages.
Just a handful:
More info: