Martijn Vels f87d30cba2 Partially inline basic_string::operator=(const basic_string&) ... Summary: This change partially inlines operator=(const basic_string&) where both the input and current instance are short strings, making the assignment a fixed length inlined memcpy. Assignments where either of the strings are long are delegate to __assign_no_alias<__is_short>(), which is templated for the long / short branch already observed in the caller. Stable: ``` -------------------------------------------------------------------------------- Benchmark Time CPU Iterations -------------------------------------------------------------------------------- BM_StringAssignStr_Empty_Opaque 2.65 ns 2.66 ns 263745536 BM_StringAssignStr_Empty_Transparent 2.95 ns 2.96 ns 236494848 BM_StringAssignStr_Small_Opaque 2.93 ns 2.94 ns 237301760 BM_StringAssignStr_Small_Transparent 2.69 ns 2.69 ns 265809920 BM_StringAssignStr_Large_Opaque 19.6 ns 19.6 ns 35573760 BM_StringAssignStr_Large_Transparent 19.1 ns 19.1 ns 36716544 BM_StringAssignStr_Huge_Opaque 1901 ns 1901 ns 364544 BM_StringAssignStr_Huge_Transparent 1889 ns 1889 ns 360448 ``` Unstable ``` -------------------------------------------------------------------------------- Benchmark Time CPU Iterations -------------------------------------------------------------------------------- BM_StringAssignStr_Empty_Opaque 1.29 ns 1.29 ns 540454912 BM_StringAssignStr_Empty_Transparent 1.11 ns 1.12 ns 628482048 BM_StringAssignStr_Small_Opaque 1.29 ns 1.29 ns 541216768 BM_StringAssignStr_Small_Transparent 1.11 ns 1.11 ns 629469184 BM_StringAssignStr_Large_Opaque 15.6 ns 15.6 ns 44945408 BM_StringAssignStr_Large_Transparent 14.9 ns 14.9 ns 46764032 BM_StringAssignStr_Huge_Opaque 1713 ns 1713 ns 401408 BM_StringAssignStr_Huge_Transparent 1704 ns 1704 ns 397312 ``` Subscribers: libcxx-commits Tags: #libc Differential Revision: https://reviews.llvm.org/D75211		2020-03-02 09:58:11 -05:00
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benchmarks	Add benchmarks for basic_string::erase	2020-02-19 17:09:25 -05:00
cmake	[libc++] Explicitly specify LIBCXX_ENABLE_SHARED to try and fix CI	2020-01-29 17:29:43 -08:00
docs	Reland [libc++] [P0325] Implement to_array from LFTS with updates.	2020-01-31 11:47:18 +01:00
fuzzing	[libc++] Tolerate NaN returning random distributions for now	2019-12-12 17:11:13 -05:00
include	Partially inline basic_string::operator=(const basic_string&)	2020-03-02 09:58:11 -05:00
lib	[libc++] Fix CI and Linux failures after landing D68480	2020-02-24 11:58:25 -05:00
src	Some fixes for open breaks on MacOS and UBSan	2020-02-26 20:51:19 -08:00
test	[libc++] Mark more try_lock tests as possibly flaky.	2020-02-27 13:25:57 -05:00
utils	[libc++] update GCC cherry-pick to build 4.8.5	2020-02-28 13:36:35 -05:00
www	[libc++] Implementation of C++20's P1135R6 for libcxx	2020-02-24 10:59:35 -05:00
.clang-format
.gitignore
appveyor-reqs-install.cmd
appveyor.yml
CMakeLists.txt	[CMake][libcxx] Don't wrap __config_site path in quotes on Windows	2020-01-29 19:37:35 -08:00
CREDITS.TXT
LICENSE.TXT
NOTES.TXT
TODO.TXT