[libcxx-commits] [libcxx] [libc++] Tiny optimizations for is_permutation (PR #129565)

[Louis Dionne via libcxx-commits]

ldionne wrote:

I also notice a bit of fluctuation between runs for this algorithm, especially for `std::list`. So far I've assumed that this was due to cache effects. The fluctuation is around 10-15% of the benchmark time for `std::list`, and less for more contiguous data structures. If you're seeing a lot more fluctuation, something may be off somewhere (in your setup or in our benchmarks).

https://github.com/llvm/llvm-project/pull/129565