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git_commit commit 9e3982d9ae8173171cd7247ee505e9c02079c6bf
Author: Peng Liu <winner245@hotmail.com>
Date: Fri Apr 18 20:57:05 2025 -0400

[libc++] Replace __libcpp_{ctz, clz} with __builtin_{ctzg, clzg} (#133920)

`__libcpp_{ctz, clz}` were previously used as fallbacks for `__builtin_{ctzg, clzg}` to ensure compatibility with older compilers (Clang 18 and earlier), as `__builtin_{ctzg, clzg}` became available in Clang 19. Now that support for Clang 18 has been officially dropped in #130142, we can now safely replace all instances of `__libcpp_{ctz, clz}` with `__count{l,r}_zero` (which internally call `__builtin_{ctzg, clzg}` and eliminate the fallback logic.

Closes #131179.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 534668 2025-12-16T16:40:01 0:00:00
Previous 534572 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 2 0
Added Tests 0 17
Unchanged Tests 86 73
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
753_ns3_r 1.64% 10.541 10.714 - 0.00% -
748_flightdm_r 1.37% 8.879 9.001 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
707_ntest_r -1.64% 18.235 17.937 - 0.00% -
767_nest_r -1.48% 14.552 14.337 - 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
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 22.167 -
707_ntest_r 17.937 -1.64%
709_cactus_r 19.721 -
710_omnetpp_r 8.953 -
721_gcc_r 12.953 -
723_llvm_r 11.483 -
727_cppcheck_r 24.964 -
729_abc_r 18.835 -
731_astcenc_r 10.097 -
734_vpr_r 15.416 -
736_ocio_r 16.248 -
737_gmsh_r 13.043 -
748_flightdm_r 9.001 1.37%
750_sealcrypto_r 18.408 -
753_ns3_r 10.714 1.64%
766_femflow_r 12.867 -
767_nest_r 14.337 -1.48%
Geometric Mean 14.463 -