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Summary: Most of the time, compiler statistics can be obtained using a process that performs a single compilation and terminates such as llc. However, this isn't always the case. JITs for example, perform multiple compilations over their lifetime and STATISTIC() will record cumulative values across all of them. Provide tools like this with the facilities needed to measure individual compilations by allowing them to reset the STATISTIC() values back to zero using llvm::ResetStatistics(). It's still the tools responsibility to ensure that they perform compilations in such a way that the results are meaningful to their intended use. Reviewers: qcolombet, rtereshin, bogner, aditya_nandakumar Reviewed By: bogner Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D44181 llvm-svn: 326981
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