[LLVMdev] how to use the profile-guided optimization of LLVM?

[海山]

hello,everyone
recently, I analyze the compiler optimization level, so I have searched the usage of profile-guided optimization of LLVM, but little result in google, therefore, could you please list detailed usage of profile-guided optimization? LLVM must be install with flags '--enable-profile'? A example will be pleasure. 
thanks 


von
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