Nikolas Klauser 1cac2be874

[libc++] Optimize copy construction and assignment of __tree (#151304) ...

```
----------------------------------------------------------------------------------------------------------
Benchmark                                                                              old             new
----------------------------------------------------------------------------------------------------------
std::map<int, int>::ctor(const&)/0                                                 15.5 ns         14.9 ns
std::map<int, int>::ctor(const&)/32                                                 474 ns          321 ns
std::map<int, int>::ctor(const&)/1024                                             24591 ns        11101 ns
std::map<int, int>::ctor(const&)/8192                                            236153 ns        98868 ns
std::map<std::string, int>::ctor(const&)/0                                         15.2 ns         14.9 ns
std::map<std::string, int>::ctor(const&)/32                                        2673 ns         2340 ns
std::map<std::string, int>::ctor(const&)/1024                                    115354 ns        86088 ns
std::map<std::string, int>::ctor(const&)/8192                                   1298510 ns       626876 ns
std::map<int, int>::operator=(const&) (into cleared Container)/0                   16.5 ns         16.1 ns
std::map<int, int>::operator=(const&) (into cleared Container)/32                   548 ns          323 ns
std::map<int, int>::operator=(const&) (into cleared Container)/1024               28418 ns        11026 ns
std::map<int, int>::operator=(const&) (into cleared Container)/8192              281827 ns        97113 ns
std::map<int, int>::operator=(const&) (into populated Container)/0                 2.42 ns         1.85 ns
std::map<int, int>::operator=(const&) (into populated Container)/32                 369 ns         73.0 ns
std::map<int, int>::operator=(const&) (into populated Container)/1024             24078 ns         2322 ns
std::map<int, int>::operator=(const&) (into populated Container)/8192            266537 ns        22963 ns
std::map<std::string, int>::operator=(const&) (into cleared Container)/0           16.6 ns         16.2 ns
std::map<std::string, int>::operator=(const&) (into cleared Container)/32          2614 ns         1622 ns
std::map<std::string, int>::operator=(const&) (into cleared Container)/1024      116826 ns        63281 ns
std::map<std::string, int>::operator=(const&) (into cleared Container)/8192     1316655 ns       649177 ns
std::map<std::string, int>::operator=(const&) (into populated Container)/0         2.42 ns         1.89 ns
std::map<std::string, int>::operator=(const&) (into populated Container)/32        1264 ns          581 ns
std::map<std::string, int>::operator=(const&) (into populated Container)/1024    238826 ns        39943 ns
std::map<std::string, int>::operator=(const&) (into populated Container)/8192   2412327 ns       379456 ns
```

Fixes #77658
Fixes #62571

2025-08-05 09:49:40 +02:00

..

20.rst

[libc++] Optimize std::getline (#121346)

2025-05-19 10:59:36 +02:00

21.rst

[libc++] Implement comparison operators for tuple added in C++23 (#148799)

2025-08-01 11:53:33 -04:00

22.rst

[libc++] Optimize copy construction and assignment of __tree (#151304)

2025-08-05 09:49:40 +02:00