[libcxx-commits] [libcxx] [libc++] Improve performance of std::midpoint for small types (PR #192804)

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serge-sans-paille wrote:

> Can we instead just get ourselves an extra bit via a `_BitInt` to do the arithmetic and truncate after again?

I've done so, but the result is slightly worse on 32 bit platforms: https://godbolt.org/z/653djMTP3

https://github.com/llvm/llvm-project/pull/192804