[PATCH] D77341: [DomTree] Replace ChildrenGetter with GraphTraits over GraphDiff.

[Nikita Popov via Phabricator via cfe-commits]

nikic added a comment.

In D77341#2144974 <https://reviews.llvm.org/D77341#2144974>, @asbirlea wrote:

> Thank you for the testing. Could you help with with instructions on how to run the tracker myself?
>  My local testing showed a negligible regression for mafft and a negligible improvement on other benchmarks, so it looked like noise on average.


The tracker just compiles test-suite under `perf stat` using the cached cmake configs. If I pick out the file with the largest regression (mafft `constants.c` in `ReleaseThinLTO` config with 18% regression) I can reproduce this locally as follows:

  perf stat /home/nikic/llvm-project/build/bin/clang -DNDEBUG  -O3 -fomit-frame-pointer -flto=thin -DNDEBUG   -w -Werror=date-time -DLLVM -MD -MT MultiSource/Benchmarks/mafft/CMakeFiles/pairlocalalign.dir/constants.c.o -MF MultiSource/Benchmarks/mafft/CMakeFiles/pairlocalalign.dir/constants.c.o.d -o MultiSource/Benchmarks/mafft/CMakeFiles/pairlocalalign.dir/constants.c.o   -c ../MultiSource/Benchmarks/mafft/constants.c

This gives me 3.5M instructions before and 4.2M instructions after. Those particular numbers are for an assertion-enabled build (the numbers on the website are without assertions.)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77341/new/

https://reviews.llvm.org/D77341