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| hardware | None |
| os | None |
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| git_commit |
commit c06ae43e26aa5cd472d0b25d5904c44d20e84067 Author: Connector Switch <c8ef@outlook.com> Date: Tue Oct 21 18:01:36 2025 +0800 [libcxx] Optimize `std::generate_n` for segmented iterators (#164266) Part of #102817. This is a natural follow-up to #163006. We are forwarding `std::generate_n` to `std::__for_each_n` (`std::for_each_n` needs c++17), resulting in improved performance for segmented iterators. before: ``` std::generate_n(deque<int>)/32 17.5 ns 17.3 ns 40727273 std::generate_n(deque<int>)/50 25.7 ns 25.5 ns 26352941 std::generate_n(deque<int>)/1024 490 ns 487 ns 1445161 std::generate_n(deque<int>)/8192 3908 ns 3924 ns 179200 ``` after: ``` std::generate_n(deque<int>)/32 11.1 ns 11.0 ns 64000000 std::generate_n(deque<int>)/50 16.1 ns 16.0 ns 44800000 std::generate_n(deque<int>)/1024 291 ns 292 ns 2357895 std::generate_n(deque<int>)/8192 2269 ns 2250 ns 298667 ``` |
Filter
ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 556671 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 556531 | 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 | 3 | 0 |
| Performance Improvements | 2 | 0 |
| Added Tests | 0 | 16 |
| Unchanged Tests | 75 | 64 |
| Total Tests | 80 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 723_llvm_r | 3.88% | 11.480 | 11.926 | - | 0.00% | - |
| 710_omnetpp_r | 1.85% | 8.284 | 8.438 | - | 0.00% | - |
| 727_cppcheck_r | 1.31% | 24.587 | 24.910 | - | 0.00% | - |
| Performance Improvements - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 731_astcenc_r | -2.89% | 10.356 | 10.057 | - | 0.00% | - |
| 737_gmsh_r | -1.68% | 13.193 | 12.971 | - | 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: 0.17s