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...zed binary, with a new profile, might perform different transformations (from the compilation of the Perf binary). It can alter the program control flow for the downstream passes, which leads to a discriminator mismatch. If the mismatch happens, the profiling information will not be updated by the SampleLoader to the affected BBs. They will inherit the profile information (like branch probabilities) from the previous round of SampleLoader. The FS component in the discriminators basically uses a sequential number, just like in the base discriminator. But to handle potential mismatch, we also encode th...

...e CSPGO) can further help profile quality and improve performance? I understand this is not practical for production use, but could give us data points as to what's left on the table due to mismatch of later FS profile loading. * In your performance experiment, where is the extra FSProfileSampleLoader in the pipeline, right before machine block placement or somewhere else? Have you tried adding more than one FSProfileSampleLoader and is there extra perf gain for more than one FSProfileSampleLoader? * For the final discriminator assignment, is this because we take MAX of samples on addres...