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git_commit commit 0621fd0b8837192612d21785ad60664516513cea
Author: Connector Switch <c8ef@outlook.com>
Date: Tue Oct 28 22:22:26 2025 +0800

[libcxx] Optimize `rng::generate_n` for segmented iterators (#165280)

Part of #102817.

This patch optimizes `rng::generate_n` for segmented iterators by
forwarding the implementation directly to `std::generate_n`.

- before

```
rng::generate_n(deque<int>)/32 21.7 ns 22.0 ns 32000000
rng::generate_n(deque<int>)/50 30.8 ns 30.7 ns 22400000
rng::generate_n(deque<int>)/1024 492 ns 488 ns 1120000
rng::generate_n(deque<int>)/8192 3938 ns 3924 ns 179200
```

- after

```
rng::generate_n(deque<int>)/32 11.0 ns 11.0 ns 64000000
rng::generate_n(deque<int>)/50 16.2 ns 16.1 ns 40727273
rng::generate_n(deque<int>)/1024 292 ns 286 ns 2240000
rng::generate_n(deque<int>)/8192 2291 ns 2302 ns 298667
```
Filter

ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 557457 2025-12-16T16:40:01 0:00:00
Previous 557344 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
Added Tests 0 16
Unchanged Tests 79 64
Total Tests 80

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
727_cppcheck_r 2.81% 24.785 25.482 - 0.00% -

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
735_gem5_r
736_ocio_r
737_gmsh_r
748_flightdm_r
750_sealcrypto_r
753_ns3_r
766_femflow_r


Report Time: 0.06s