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| git_commit |
commit 81b81354f8c117fab07823fef24b97b3a1f47834 Author: Peng Liu <winner245@hotmail.com> Date: Wed May 21 12:16:40 2025 -0400 [libc++] Optimize bitset::to_string (#128832) This patch optimizes `bitset::to_string` by replacing the existing bit-by-bit processing with a more efficient bit traversal strategy. Instead of checking each bit sequentially, we leverage `std::__countr_zero` to efficiently locate the next set bit, skipping over consecutive zero bits. This greatly accelerates the conversion process, especially for sparse `bitset`s where zero bits dominate. To ensure similar improvements for dense `bitset`s, we exploit symmetry by inverting the bit pattern, allowing us to apply the same optimized traversal technique. Even for uniformly distributed `bitset`s, the proposed approach offers measurable performance gains over the existing implementation. Benchmarks demonstrate substantial improvements, achieving up to 13.5x speedup for sparse `bitset`s with `Pr(true bit) = 0.1`, 16.1x for dense `bitset`s with `Pr(true bit) = 0.9`, and 8.3x for uniformly distributed `bitset`s with `Pr(true bit) = 0.5)`. |
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ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 538271 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 538269 | 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 |
| Performance Improvements | 1 | 0 |
| Added Tests | 0 | 18 |
| Unchanged Tests | 85 | 72 |
| Total Tests | 90 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 735_gem5_r | 1.74% | 13.728 | 13.966 | - | 0.00% | - |
| 709_cactus_r | 1.73% | 19.664 | 20.005 | - | 0.00% | - |
| 721_gcc_r | 1.68% | 12.988 | 13.206 | - | 0.00% | - |
| 707_ntest_r | 1.39% | 18.250 | 18.504 | - | 0.00% | - |
| Performance Improvements - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 710_omnetpp_r | -6.16% | 9.479 | 8.895 | - | 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: 0.15s