[llvm-dev] LLVM compile-time regression tracking?

[Nikita Popov via llvm-dev]

Hi,

Does the LLVM project perform any kind of tracking for commit-by-commit
compile-time changes? It looks like LNT only tracks run-time performance
(and to be honest I wasn't able to make heads or tails of the results even
for that -- the interface was pretty unintuitive to me.)

While it is "normal" that each new LLVM release regresses compile-time by
2-3%, LLVM 10 seems to be going for a new record here, with optimized
builds regressing by around 5-15%, and that's already after mitigating the
largest regression:
https://perf.rust-lang.org/compare.html?start=58b834344fc7b9185e7a50db1ff24e5eb07dae5e&end=f9c17b2d9bd4ca61bb0eb8b226dd61aaf254156c

It does not seem like these regressions are specific to Rust either, see
for example https://bugs.llvm.org/show_bug.cgi?id=44408.

The Rust project tracks compile-time results for each commit (see link
above), and thanks to that can quickly spot and revert changes that
negatively affect performance. I think it would be really great if
something similar would exist for LLVM...

Regards,
Nikita
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