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git_commit commit e9280a1d39af88468ffea9a14fad5bf96d51d6e6
Author: Peng Liu <winner245@hotmail.com>
Date: Sat Apr 19 07:12:43 2025 -0400

[libc++] Backport segmented iterator optimization for std::for_each to C++11 (#134960)

Previously, the segmented iterator optimization for `std::for_each` was restricted to C++23 and later due to its dependency on `__movable_box`, which is not available in earlier standards. This patch eliminates that restriction, enabling consistent optimizations starting from C++11.

By backporting this enhancement, we improve performance across older standards and create opportunities to extend similar optimizations to other algorithms by forwarding their calls to `std::for_each`.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 534710 2025-12-16T16:40:01 0:00:00
Previous 534678 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 1 0
Added Tests 0 18
Unchanged Tests 86 72
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
707_ntest_r 3.02% 17.762 18.299 - 0.00% -
753_ns3_r 1.10% 10.526 10.642 - 0.00% -
734_vpr_r 1.08% 15.401 15.568 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
729_abc_r -2.79% 19.135 18.602 - 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: 0.08s
Name Current %
706_stockfish_r 22.045 -
707_ntest_r 18.299 3.02%
709_cactus_r 19.713 -
710_omnetpp_r 9.003 -
721_gcc_r 12.912 -
723_llvm_r 11.481 -
727_cppcheck_r 25.205 -
729_abc_r 18.602 -2.79%
731_astcenc_r 10.011 -
734_vpr_r 15.568 1.08%
735_gem5_r 13.979 -
736_ocio_r 16.129 -
737_gmsh_r 13.061 -
748_flightdm_r 8.849 -
750_sealcrypto_r 18.288 -
753_ns3_r 10.642 1.10%
766_femflow_r 12.774 -
767_nest_r 14.106 -
Geometric Mean 14.400 -