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git_commit commit c358979d7f45fc7624abc2f14e6f36f25ac9acc0
Author: Hui <hui.xie1990@gmail.com>
Date: Sun Jul 6 09:23:19 2025 +0100

[libc++] fix atomic::wait memory order (#146267)

Fixes #109290

See the GH issue for the details. In conclusion, we have two issues in
the `atomic<T>::wait` when `T` does not match our `contention_t`:
- We don't have a total single order which can leads to missed
notification based on the Herd7 simulation on relaxed architectural like
PowerPC
- We assumed the platform wait (`futex_wait`/`__ulock_wait`) has seq_cst
barrier internally but there is no such guarantee
Filter

ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 543583 2025-12-16T16:40:01 0:00:00
Previous 543560 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 2 0
Performance Improvements 3 0
Added Tests 0 17
Unchanged Tests 80 68
Total Tests 85

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
753_ns3_r 2.02% 10.714 10.931 - 0.00% -
723_llvm_r 1.21% 11.551 11.691 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
735_gem5_r -2.81% 14.369 13.966 - 0.00% -
748_flightdm_r -1.86% 9.032 8.864 - 0.00% -
710_omnetpp_r -1.49% 8.734 8.603 - 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
734_vpr_r
735_gem5_r
736_ocio_r
737_gmsh_r
748_flightdm_r
750_sealcrypto_r
753_ns3_r
766_femflow_r


Report Time: 0.25s
Name Current %
706_stockfish_r 22.293 -
707_ntest_r 18.163 -
709_cactus_r 19.799 -
710_omnetpp_r 8.603 -1.49%
721_gcc_r 13.148 -
723_llvm_r 11.691 1.21%
727_cppcheck_r 25.137 -
729_abc_r 18.998 -
731_astcenc_r 10.075 -
734_vpr_r 15.356 -
735_gem5_r 13.966 -2.81%
736_ocio_r 16.304 -
737_gmsh_r 13.184 -
748_flightdm_r 8.864 -1.86%
750_sealcrypto_r 18.574 -
753_ns3_r 10.931 2.02%
766_femflow_r 12.892 -
Geometric Mean 14.487 -