| 文件 | 最后提交记录 | 最后更新时间 |
|---|---|---|
[libc++] Move the locale support headers to __locale_dir/locale_base_api/ (#74522) Differential Revision: https://reviews.llvm.org/D147869 | 2 年前 | |
[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 | 8 个月前 |