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| os | None |
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| git_commit |
commit 274a4c0c03af8f37108479328285299414268cfa Author: Alcaro <floating@muncher.se> Date: Fri Nov 21 13:59:38 2025 +0100 [libc++] Optimize std::has_single_bit (#133063) Clang translates most implementations of has_single_bit to `(v ^ (v-1)) > v-1` - except the one definition libc++ actually uses. Proof of correctness: https://godbolt.org/z/d61bxW4r1 (Could also be fixed by teaching Clang to optimize better, but making source match output feels clearer to me. And it improves unoptimized performance.) |
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ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 560255 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 560036 | 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 | 2 | 0 |
| Added Tests | 0 | 16 |
| Unchanged Tests | 77 | 64 |
| Total Tests | 80 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 710_omnetpp_r | 1.14% | 8.521 | 8.617 | - | 0.00% | - |
| Performance Improvements - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 723_llvm_r | -1.41% | 11.675 | 11.510 | - | 0.00% | - |
| 727_cppcheck_r | -1.11% | 24.856 | 24.581 | - | 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 |
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