[all-commits] [llvm/llvm-project] 985c1a: [libc++] Optimize the two range overload of mismat...

[Nikolas Klauser via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 985c1a44f8d49e0afeba907fe29d881c19b319fc
      https://github.com/llvm/llvm-project/commit/985c1a44f8d49e0afeba907fe29d881c19b319fc
  Author: Nikolas Klauser <nikolasklauser at berlin.de>
  Date:   2024-04-01 (Mon, 01 Apr 2024)

  Changed paths:
    M libcxx/benchmarks/algorithms/mismatch.bench.cpp
    M libcxx/include/__algorithm/mismatch.h
    M libcxx/include/__algorithm/ranges_mismatch.h
    M libcxx/include/__algorithm/simd_utils.h
    M libcxx/test/libcxx/transitive_includes/cxx23.csv
    M libcxx/test/libcxx/transitive_includes/cxx26.csv
    M libcxx/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp

  Log Message:
  -----------
  [libc++] Optimize the two range overload of mismatch (#86853)

```
-----------------------------------------------------------------------------
Benchmark                                                 old             new
-----------------------------------------------------------------------------
bm_mismatch_two_range_overload<char>/1               0.941 ns         1.88 ns
bm_mismatch_two_range_overload<char>/2                1.43 ns         2.15 ns
bm_mismatch_two_range_overload<char>/3                1.95 ns         2.55 ns
bm_mismatch_two_range_overload<char>/4                2.58 ns         2.90 ns
bm_mismatch_two_range_overload<char>/5                3.75 ns         3.31 ns
bm_mismatch_two_range_overload<char>/6                5.00 ns         3.83 ns
bm_mismatch_two_range_overload<char>/7                5.59 ns         4.35 ns
bm_mismatch_two_range_overload<char>/8                6.37 ns         4.84 ns
bm_mismatch_two_range_overload<char>/16               11.8 ns         6.72 ns
bm_mismatch_two_range_overload<char>/64               45.5 ns         2.59 ns
bm_mismatch_two_range_overload<char>/512               366 ns         12.6 ns
bm_mismatch_two_range_overload<char>/4096             2890 ns         91.6 ns
bm_mismatch_two_range_overload<char>/32768           23038 ns          758 ns
bm_mismatch_two_range_overload<char>/262144         142813 ns         6573 ns
bm_mismatch_two_range_overload<char>/1048576        366679 ns        26710 ns
bm_mismatch_two_range_overload<short>/1              0.934 ns         1.88 ns
bm_mismatch_two_range_overload<short>/2               1.30 ns         2.58 ns
bm_mismatch_two_range_overload<short>/3               1.76 ns         3.28 ns
bm_mismatch_two_range_overload<short>/4               2.24 ns         3.98 ns
bm_mismatch_two_range_overload<short>/5               2.80 ns         4.92 ns
bm_mismatch_two_range_overload<short>/6               3.58 ns         6.01 ns
bm_mismatch_two_range_overload<short>/7               4.29 ns         7.03 ns
bm_mismatch_two_range_overload<short>/8               4.67 ns         7.39 ns
bm_mismatch_two_range_overload<short>/16              9.86 ns         13.1 ns
bm_mismatch_two_range_overload<short>/64              38.9 ns         4.55 ns
bm_mismatch_two_range_overload<short>/512              348 ns         27.7 ns
bm_mismatch_two_range_overload<short>/4096            2881 ns          225 ns
bm_mismatch_two_range_overload<short>/32768          23111 ns         1715 ns
bm_mismatch_two_range_overload<short>/262144        184846 ns        14416 ns
bm_mismatch_two_range_overload<short>/1048576       742885 ns        57264 ns
bm_mismatch_two_range_overload<int>/1                0.838 ns         1.19 ns
bm_mismatch_two_range_overload<int>/2                 1.19 ns         1.65 ns
bm_mismatch_two_range_overload<int>/3                 1.83 ns         2.06 ns
bm_mismatch_two_range_overload<int>/4                 2.38 ns         2.42 ns
bm_mismatch_two_range_overload<int>/5                 3.60 ns         2.47 ns
bm_mismatch_two_range_overload<int>/6                 3.68 ns         3.05 ns
bm_mismatch_two_range_overload<int>/7                 4.32 ns         3.36 ns
bm_mismatch_two_range_overload<int>/8                 5.18 ns         3.58 ns
bm_mismatch_two_range_overload<int>/16                10.6 ns         2.84 ns
bm_mismatch_two_range_overload<int>/64                39.0 ns         7.78 ns
bm_mismatch_two_range_overload<int>/512                247 ns         53.9 ns
bm_mismatch_two_range_overload<int>/4096              1927 ns          429 ns
bm_mismatch_two_range_overload<int>/32768            15569 ns         3393 ns
bm_mismatch_two_range_overload<int>/262144          125413 ns        28504 ns
bm_mismatch_two_range_overload<int>/1048576         504549 ns       112729 ns
```



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