@microsoft-github-policy-service agree company="Arm"

Hopefully I’ve done something reasonable here - please let me know if you would prefer a different approach when adding new implementations to vector_algorithms.cpp

The performance numbers are below - looks good apart from the case of size(1), which I think is due to the added overhead of the function call and the conditional checks now std::swap_ranges is not being inlined into the benchmark.

Thanks @hazzlim, this is awesome! 😻 I pushed some commits, can you rerun your benchmark measurements? We finally have ARM64 runtime testing in PR checks, but I won't be able to gather perf measurements myself until Feb 2026-ish. The changes to override /Os for ARM64, and to eliminate unnecessary loops, should improve performance but perhaps by an unobservable amount.

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

Thanks @hazzlim, this is awesome! 😻 I pushed some commits, can you rerun your benchmark measurements? We finally have ARM64 runtime testing in PR checks, but I won't be able to gather perf measurements myself until Feb 2026-ish. The changes to override /Os for ARM64, and to eliminate unnecessary loops, should improve performance but perhaps by an unobservable amount.

Nice, thanks for doing this! Not sure how I missed that we could remove the loops for len < 64, nice one 😺

I will re-run the perf and report, it may well be unobservable but I think it should also improve the LDP generation so that's a win :)

Thanks for working towards #813 and congratulations on your first microsoft/STL commit! 😻 🎉 🦾

This will ship in the MSVC Build Tools 14.51 in a future update to Visual Studio 2026.