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...t a .profraw - Get the .profdata - Give that back to clang with -fprofile-instr-use and generate .ll - I note that here we get "branch_weights" stats, so if a branch is a back-edge, it basically gives us the iteration count. For example, check the bottom of this file: https://pastebin.com/ZnQqJdTN which was created with the procedure above. - Then, create a custom pass that goes through every loop and gathers this "branch_weights" data. I feel like this is both not very accurate and overly complicated for something that I guess a lot of people probably have needed to gather in the...