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| git_commit |
commit e8f61801c6237e56b3d69190af7a7acfdcede1e8 Author: Christopher Di Bella <cjdb@google.com> Date: Fri Sep 12 06:33:10 2025 -0700 [libcxx] adds size-based `__split_buffer` representation to unstable ABI (#139632) **tl;dr** We can significantly improve the runtime performance of `std::vector` by changing its representation from three pointers to one pointer and two integers. This document explains the details of this change, along with the justifications for making it. See the [RFC] for more information. `vector` depends on `__split_buffer` for inserting elements. Changing `__split_buffer` to match `vector`'s representation simplifies the model, as it eliminates the need to convert between two different representations of a contiguous buffer in the same configuration of libc++. [RFC]: https://discourse.llvm.org/t/adding-a-size-based-vector-to-libc-s-unstable-abi/86306 --------- Co-authored-by: Jorge Gorbe Moya <jgorbe@google.com> |
Filter
ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 552339 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 552558 | 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 |
| Added Tests | 0 | 15 |
| Unchanged Tests | 72 | 60 |
| Total Tests | 75 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 727_cppcheck_r | 2.65% | 24.401 | 25.049 | - | 0.00% | - |
| 707_ntest_r | 1.90% | 17.862 | 18.202 | - | 0.00% | - |
| 766_femflow_r | 1.20% | 12.832 | 12.985 | - | 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 |
| 736_ocio_r |
| 737_gmsh_r |
| 748_flightdm_r |
| 750_sealcrypto_r |
| 753_ns3_r |
| 766_femflow_r |
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