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git_commit commit 45d493b680e3e79e4e9c19d665df83823c52a73a
Author: Louis Dionne <ldionne.2@gmail.com>
Date: Thu May 8 16:35:00 2025 -0400

[libc++] Add the __is_replaceable type trait (#132408)

That type trait represents whether move-assigning an object is
equivalent to destroying it and then move-constructing a new one from
the same argument. This will be useful in a few places where we may want
to destroy + construct instead of doing an assignment, in particular
when implementing some container operations in terms of relocation.

This is effectively adding a library emulation of P2786R12's
is_replaceable trait, similarly to what we do for trivial relocation.
Eventually, we can replace this library emulation by the real
compiler-backed trait.

This is building towards #129328.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 536811 2025-12-16T16:40:01 0:00:00
Previous 536627 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 1 0
Performance Improvements 1 0
Added Tests 0 18
Unchanged Tests 88 72
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
766_femflow_r 1.69% 12.780 12.997 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
735_gem5_r -1.04% 13.950 13.805 - 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: 0.97s