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| git_commit |
commit 2bdd1357c826afe681ab0d6ddfa8fb814b2cef6a Author: Nikolas Klauser <nikolasklauser@berlin.de> Date: Mon Nov 24 16:53:58 2025 +0100 [libc++] Optimize num_get integral functions (#121795) ``` --------------------------------------------------- Benchmark old new --------------------------------------------------- BM_num_get<bool> 86.5 ns 32.3 ns BM_num_get<long> 82.1 ns 30.3 ns BM_num_get<long long> 85.2 ns 33.4 ns BM_num_get<unsigned short> 85.3 ns 31.2 ns BM_num_get<unsigned int> 84.2 ns 31.1 ns BM_num_get<unsigned long> 83.6 ns 31.9 ns BM_num_get<unsigned long long> 87.7 ns 31.5 ns BM_num_get<float> 116 ns 114 ns BM_num_get<double> 114 ns 114 ns BM_num_get<long double> 113 ns 114 ns BM_num_get<void*> 151 ns 144 ns ``` This patch applies multiple optimizations: - Stages two and three of do_get are merged and a custom integer parser has been implemented This avoids allocations, removes the need for strto{,u}ll and avoids __stage2_int_loop (avoiding extra writes to memory) - std::find has been replaced with __atoms_offset, which uses vector instructions to look for a character Fixes #158100 Fixes #158102 |
Filter
ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 560475 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 560467 | 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 | 4 | 0 |
| Added Tests | 0 | 16 |
| Unchanged Tests | 76 | 64 |
| Total Tests | 80 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 735_gem5_r | 3.34% | 13.278 | 13.722 | - | 0.00% | - |
| 710_omnetpp_r | 1.92% | 8.398 | 8.559 | - | 0.00% | - |
| 707_ntest_r | 1.91% | 16.508 | 16.822 | - | 0.00% | - |
| 729_abc_r | 1.08% | 18.680 | 18.881 | - | 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: 0.13s