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git_commit commit edc3dc6abd9dec70f03107d1477a2baffe7208f7
Author: Peng Liu <winner245@hotmail.com>
Date: Thu Jan 30 14:55:05 2025 -0500

[libc++] Optimize ranges::copy_backward for vector<bool>::iterator (#121026)

As a follow-up to #121013 (which focused on `std::ranges::copy`), this
PR optimizes the performance of `std::ranges::copy_backward` for
`vector<bool>::iterator`, addressing a subtask outlined in issue #64038.
The optimizations yield performance improvements of up to 2000x for
aligned copies and 60x for unaligned copies.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 525778 2025-12-16T16:40:01 0:00:00
Previous 525743 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 1 0
Added Tests 0 18
Unchanged Tests 87 72
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
729_abc_r 1.77% 18.676 19.006 - 0.00% -
737_gmsh_r 1.03% 13.038 13.173 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
727_cppcheck_r -2.59% 25.139 24.489 - 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: 0.13s
Name Current %
706_stockfish_r 22.144 -
707_ntest_r 17.807 -
709_cactus_r 19.729 -
710_omnetpp_r 8.554 -
721_gcc_r 12.926 -
723_llvm_r 11.531 -
727_cppcheck_r 24.489 -2.59%
729_abc_r 19.006 1.77%
731_astcenc_r 10.025 -
734_vpr_r 15.426 -
735_gem5_r 13.839 -
736_ocio_r 16.207 -
737_gmsh_r 13.173 1.03%
748_flightdm_r 8.895 -
750_sealcrypto_r 18.363 -
753_ns3_r 10.628 -
766_femflow_r 12.773 -
767_nest_r 14.199 -
Geometric Mean 14.348 -