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    Sometimes compilers aren’t very good.

    How much time would you have to invest in learning Assembly until you start to find inefficiencies in compiler performance?

    Also, keep in mind that the abstractions you write for the compiler to work with could be a horrible solution to solving a particular problem.

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      It’s usually not too complicated to spot, problem is the compiler generates an awful lot of assembly and you have to look in the right place(most of the output is optimal already).