[libcxx-commits] [libcxx] Speed up std::invoke() compile times (~60%-85% reduction) (PR #213403)

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higher-performance wrote:

@philnik777 there's definitely more stuff here beyond the fallback path, but I can rebase once you get the simplification merged (your CI isn't passing right now). I will say that there is a decent chance that some of the complexities might be needed for faster compilation, but we can look at that after you simplify.

https://github.com/llvm/llvm-project/pull/213403