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...pdate all tests (Polly as `ninja polly-update-format` to automatically update `ninja polly-check-format` failures), updating is easier, but because of the lack of understanding in practice most changes will just be glossed over. We already have a split between unittests (eg. llvm/Transforms/Scalar/LICMTests.cpp) and regression tests (llvm/test/Transforms/LICM/*.ll). New tests in D82426 are located next to the .ll files. The unittests could be moved there too. Michael

Hello LLVM community, For testing IR passes, LLVM currently has two kinds of tests: 1. regression tests (in llvm/test); .ll files invoking opt, and matching its text output using FileCheck. 2. unittests (in llvm/unittests); Google tests containing the IR as a string, constructing a pass pipeline, and inspecting the output using code. I propose to add an additional kind of test, which I call