c++ - profiler : enable/disable depend on value of a (global?) variable -


i want profile @ time-steps. game.

my game loop (heavily simplified):-

for(int t=0;t<1000000;t++){     dogameloop();  // logic -> physic -> graphic -> sleep -> clear allocator ... };

in visual studio, how profile dogameloop() e.g. when 43<=t<=45?
want profile while -o2 turn on (release mode).

now, can profile whole program via
(top bar) > debug > performance profiler > cpu usage.
show graphical tree https://blogs.msdn.microsoft.com/devops/2015/10/29/profile-your-cpu-in-the-debugger-in-visual-studio-2015/.

i don't mind solution make t global variable, or insert microsoft-specific piece of code near dogameloop().
prefer not change other parts of code.

(i have searched solution few months.)

i heard queryperformancecounter may help, have no idea it.


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