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AFAIK profilers can only tell how much time is spent in each function. But since C++ compilers tend to inline code aggressively and also some functions are not that short it’s often useful to know more details – how much time each construct consumes.
How can this be achieved except restructuring code into smaller functions?
If you use a sampling profiler (e.g. Zoom or Shark), rather than an instrumented profiler (e.g. gprof) then you can get much finer grained profiles, down to the statement and instruction level.