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A new hidden option -print-changed is added along with code to support printing the IR as it passes through the opt pipeline in the new pass manager. Only those passes that change the IR are reported, with others only having the banner reported, indicating that they did not change the IR, were filtered out or ignored. Filtering of output via the -filter-print-funcs is supported and a new supporting hidden option -filter-passes is added. The latter takes a comma separated list of pass names and filters the output to only show those passes in the list that change the IR. The output can also be modified via the -print-module-scope function. The code introduces a template base class that generalizes the comparison of IRs that takes an IR representation as template parameter. The constructor takes a series of lambdas that provide an event based API for generalized reporting of IRs as they are changed in the opt pipeline through the new pass manager. The first of several instantiations is provided that prints the IR in a form similar to that produced by -print-after-all with the above mentioned filtering capabilities. This version, and the others to follow will be introduced at the upcoming developer's conference. See https://hotcrp.llvm.org/usllvm2020/paper/29 for more information. Reviewed By: yrouban (Yevgeny Rouban) Differential Revision: https://reviews.llvm.org/D86360 |
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