[flang-commits] [clang] [flang] [llvm] [flang][cmake][perf-training] Optimize flang with PGO and BOLT (PR #198863)

[Michael Kruse via flang-commits]

https://github.com/Meinersbur commented:

The regression tests are not good sources for profiling data. By design, they test edge cases, not the regular case we would want to optimize for. However, lacking alternatives might still be the best thing we have, or as a stage1 approximation. IMHO we can go forward with this.

Could you add comments to bolt.lit.cfg, pgo.lit.cfg, lit.site.cfg.py.in/test.lit.cfg stating that these are used in specific configurations, such as LLVM_BUILD_INSTRUMENTED=ON will use pgo.lit.cfg


https://github.com/llvm/llvm-project/pull/198863