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git_commit commit cbbf303ff51b61315f82b0f87bb52db2bedf2b78
Author: Nikolas Klauser <nikolasklauser@berlin.de>
Date: Fri Aug 15 08:57:33 2025 +0200

[libc++] Optimize __hash_table copy constructors and assignment (#151951)

```
----------------------------------------------------------------------------------------------------------------------
Benchmark old new
----------------------------------------------------------------------------------------------------------------------
std::unordered_set<int>::ctor(const&)/0 15.4 ns 14.6 ns
std::unordered_set<int>::ctor(const&)/32 686 ns 322 ns
std::unordered_set<int>::ctor(const&)/1024 35839 ns 21490 ns
std::unordered_set<int>::ctor(const&)/8192 385790 ns 280270 ns
std::unordered_set<int>::operator=(const&) (into cleared Container)/0 15.1 ns 15.9 ns
std::unordered_set<int>::operator=(const&) (into cleared Container)/32 1077 ns 333 ns
std::unordered_set<int>::operator=(const&) (into cleared Container)/1024 31296 ns 9984 ns
std::unordered_set<int>::operator=(const&) (into cleared Container)/8192 266776 ns 109418 ns
std::unordered_set<int>::operator=(const&) (into partially populated Container)/0 15.1 ns 16.3 ns
std::unordered_set<int>::operator=(const&) (into partially populated Container)/32 962 ns 320 ns
std::unordered_set<int>::operator=(const&) (into partially populated Container)/1024 31713 ns 10128 ns
std::unordered_set<int>::operator=(const&) (into partially populated Container)/8192 266113 ns 108525 ns
std::unordered_set<int>::operator=(const&) (into populated Container)/0 0.990 ns 2.03 ns
std::unordered_set<int>::operator=(const&) (into populated Container)/32 963 ns 263 ns
std::unordered_set<int>::operator=(const&) (into populated Container)/1024 27600 ns 7793 ns
std::unordered_set<int>::operator=(const&) (into populated Container)/8192 235295 ns 66248 ns
std::unordered_set<std::string>::ctor(const&)/0 16.0 ns 15.0 ns
std::unordered_set<std::string>::ctor(const&)/32 2950 ns 1277 ns
std::unordered_set<std::string>::ctor(const&)/1024 246935 ns 73762 ns
std::unordered_set<std::string>::ctor(const&)/8192 3310895 ns 2468608 ns
std::unordered_set<std::string>::operator=(const&) (into cleared Container)/0 16.1 ns 15.8 ns
std::unordered_set<std::string>::operator=(const&) (into cleared Container)/32 5856 ns 1039 ns
std::unordered_set<std::string>::operator=(const&) (into cleared Container)/1024 170436 ns 74836 ns
std::unordered_set<std::string>::operator=(const&) (into cleared Container)/8192 1574235 ns 1096891 ns
std::unordered_set<std::string>::operator=(const&) (into partially populated Container)/0 16.0 ns 16.3 ns
std::unordered_set<std::string>::operator=(const&) (into partially populated Container)/32 5571 ns 1064 ns
std::unordered_set<std::string>::operator=(const&) (into partially populated Container)/1024 199220 ns 75462 ns
std::unordered_set<std::string>::operator=(const&) (into partially populated Container)/8192 1552465 ns 1116094 ns
std::unordered_set<std::string>::operator=(const&) (into populated Container)/0 1.70 ns 2.14 ns
std::unordered_set<std::string>::operator=(const&) (into populated Container)/32 2562 ns 645 ns
std::unordered_set<std::string>::operator=(const&) (into populated Container)/1024 228608 ns 39100 ns
std::unordered_set<std::string>::operator=(const&) (into populated Container)/8192 2013723 ns 390401 ns
```

Fixes #77657
Filter

ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 548662 2025-12-16T16:40:01 0:00:00
Previous 548522 2025-12-16T16:40:01 0:00:00
Baseline 485288 2025-12-16T16:40:01 0:00:00


Tests Summary

Status Group # # (B)
Performance Regressions 1 0
Performance Improvements 1 0
Added Tests 0 16
Unchanged Tests 78 64
Total Tests 80

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
748_flightdm_r 1.58% 8.872 9.011 0.025 0.00% 0.025

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
727_cppcheck_r -1.97% 24.873 24.383 0.124 0.00% 0.124

Added Tests - execution_time
706_stockfish_r
707_ntest_r
709_cactus_r
710_omnetpp_r
721_gcc_r
723_llvm_r
727_cppcheck_r
729_abc_r
731_astcenc_r
734_vpr_r
736_ocio_r
737_gmsh_r
748_flightdm_r
750_sealcrypto_r
753_ns3_r
766_femflow_r


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