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git_commit commit 833d5f0cd8bec8de84cdbefc49c4ef4566a5b356
Author: Nikolas Klauser <nikolasklauser@berlin.de>
Date: Thu Sep 25 11:35:41 2025 +0200

[libc++] Avoid constructing additional objects when using map::at (#157866)

This patch adds additional overloads to `map::at` in case its known that
the argument is transparently comparable to the key type. This avoids
actually constructing the key type in some cases, potentially removing
allocations.

```
--------------------------------------------------------
Benchmark old new
--------------------------------------------------------
BM_map_find_string_literal 12.8 ns 2.68 ns
```
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 553858 2025-12-16T16:40:01 0:00:00
Previous 553846 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 16
Unchanged Tests 78 64
Total Tests 80

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
707_ntest_r 2.34% 17.969 18.389 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
731_astcenc_r -1.39% 10.262 10.119 - 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
735_gem5_r
736_ocio_r
737_gmsh_r
748_flightdm_r
750_sealcrypto_r
753_ns3_r
766_femflow_r


Report Time: 0.11s