[llvm-branch-commits] [llvm] release/21.x: [TailDup] Delay aggressive computed-goto taildup to after RegAlloc. (#150911) (PR #151680)

[Florian Hahn via llvm-branch-commits]

fhahn wrote:

> Compared with immediate failures, performance regressions is hard to be found and located. I think that's the reason why we don't backport performance related patches.

We usually can back-port patches to fix performance regressions, which this patch does (3% regression for Python workloads vs 20.1.0). For example, the patch that was causing the regression was picked for 20.1.1 IIRC.

https://github.com/llvm/llvm-project/pull/151680