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git_commit commit a12744ff05bbc2d0de711afb8b3a1c7a03a33914
Author: Peng Liu <winner245@hotmail.com>
Date: Tue Mar 4 17:15:36 2025 -0500

[libc++] Optimize ranges::swap_ranges for vector<bool>::iterator (#121150)

This PR optimizes the performance of `std::ranges::swap_ranges` for
`vector<bool>::iterator`, addressing a subtask outlined in issue #64038.
The optimizations yield performance improvements of up to **611x** for
aligned range swap and **78x** for unaligned range swap comparison.
Additionally, comprehensive tests covering up to 4 storage words (256
bytes) with odd and even bit sizes are provided, which validate the
proposed optimizations in this patch.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 529394 2025-12-16T16:40:01 0:00:00
Previous 529346 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 4 0
Performance Improvements 4 0
Added Tests 0 18
Unchanged Tests 82 72
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
710_omnetpp_r 3.59% 8.306 8.604 - 0.00% -
767_nest_r 2.24% 14.000 14.314 - 0.00% -
727_cppcheck_r 1.26% 24.952 25.266 - 0.00% -
734_vpr_r 1.07% 15.167 15.330 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
766_femflow_r -2.65% 13.098 12.751 - 0.00% -
707_ntest_r -2.23% 18.238 17.832 - 0.00% -
748_flightdm_r -1.15% 9.016 8.912 - 0.00% -
735_gem5_r -1.11% 13.862 13.708 - 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
767_nest_r


Report Time: 0.09s
Name Current %
706_stockfish_r 22.260 -
707_ntest_r 17.832 -2.23%
709_cactus_r 19.733 -
710_omnetpp_r 8.604 3.59%
721_gcc_r 13.053 -
723_llvm_r 11.493 -
727_cppcheck_r 25.266 1.26%
729_abc_r 18.651 -
731_astcenc_r 10.015 -
734_vpr_r 15.330 1.07%
735_gem5_r 13.708 -1.11%
736_ocio_r 16.139 -
737_gmsh_r 13.177 -
748_flightdm_r 8.912 -1.15%
750_sealcrypto_r 18.361 -
753_ns3_r 10.705 -
766_femflow_r 12.751 -2.65%
767_nest_r 14.314 2.24%
Geometric Mean 14.369 -