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| git_commit |
commit 479f9922912e3385655f0ca6e6238aaf09e6320d Author: A. Jiang <de34@live.cn> Date: Thu Jun 5 07:23:49 2025 +0800 [libc++] Fix `basic_string::shrink_to_fit` for constant evaluation (#142712) Currently, when the string shrink into the SSO buffer, the `__rep_.__s` member isn't activated before the `traits_type::copy` call yet, so internal `__builtin_memmove` call writing to the buffer causes constant evaluation failure. The existing test coverage seems a bit defective and doesn't cover this case - `shrink_to_fit` is called on the copy of string after erasure, not the original string object. This PR reorders the `__set_short_size` call, which starts the lifetime of the SSO buffer, before the copy operation. Test coverage is achieved by calling `shrink_to_fit` on the original erased string. |
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ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 539893 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 539857 | 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 |
| Added Tests | 1 | 18 |
| Unchanged Tests | 88 | 72 |
| Total Tests | 90 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 748_flightdm_r | 1.49% | 8.829 | 8.961 | 0.011 | 0.00% | 0.011 |
| Added Tests - execution_time |
|---|
| 735_gem5_r |
| 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: 0.14s