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git_commit commit 649cbcc3764c554c9c9839f021d073fa9a9f0515
Author: Peng Liu <winner245@hotmail.com>
Date: Wed Mar 26 12:02:03 2025 -0400

[libc++] Remove unnecessary division and modulo operations in bitset (#121312)

The PR removes the unnecessary division and modulo operations in the
one-word specialization `__bitset<1, _Size>`. The reason is that for the
one-word specialization, we have `__pos < __bits_per_word` (as
`__bitset<1, _Size>` is an implementation detail only used by the public
`bitset`). So `__pos / __bits_per_word == 0` and `__pos / __pos %
__bits_per_word == __pos`.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 532017 2025-12-16T16:40:01 0:00:00
Previous 531971 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 4 0
Added Tests 0 18
Unchanged Tests 83 72
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
748_flightdm_r 2.25% 8.865 9.064 - 0.00% -
707_ntest_r 2.19% 17.895 18.286 - 0.00% -
727_cppcheck_r 2.16% 25.019 25.561 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
734_vpr_r -2.24% 15.567 15.218 - 0.00% -
723_llvm_r -1.28% 11.545 11.397 - 0.00% -
709_cactus_r -1.26% 19.957 19.705 - 0.00% -
753_ns3_r -1.14% 10.762 10.639 - 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: 1.21s
Name Current %
706_stockfish_r 22.142 -
707_ntest_r 18.286 2.19%
709_cactus_r 19.705 -1.26%
710_omnetpp_r 8.401 -
721_gcc_r 12.927 -
723_llvm_r 11.397 -1.28%
727_cppcheck_r 25.561 2.16%
729_abc_r 18.742 -
731_astcenc_r 10.090 -
734_vpr_r 15.218 -2.24%
735_gem5_r 14.018 -
736_ocio_r 16.163 -
737_gmsh_r 13.049 -
748_flightdm_r 9.064 2.25%
750_sealcrypto_r 18.413 -
753_ns3_r 10.639 -1.14%
766_femflow_r 12.853 -
767_nest_r 14.189 -
Geometric Mean 14.385 -