Revert "Reapply "[libc++] Explicitly convert to masks in SIMD code (#107983)"" (#122022)

Reverts llvm/llvm-project#121352

Triggers "vector type should not be a bool!" on:
```
bool a[100];

Revert "Reapply "[libc++] Explicitly convert to masks in SIMD code (#107983)"" (#122022)

Reverts llvm/llvm-project#121352

Triggers "vector type should not be a bool!" on:
```
bool a[100];
bool b[100];
auto t = std::mismatch(std::begin(a), std::end(a), std::begin(b), std::end(b));
```

https://godbolt.org/z/Y73s3sdef

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[libc++] Put _LIBCPP_NODEBUG on all internal aliases (#118710)

This significantly reduces the amount of debug information generated
for codebases using libc++, without hurting the debugging experie

[libc++] Put _LIBCPP_NODEBUG on all internal aliases (#118710)

This significantly reduces the amount of debug information generated
for codebases using libc++, without hurting the debugging experience.

show more ...

Reapply "[libc++] Explicitly convert to masks in SIMD code (#107983)" (#121352)

This reverts commit 0ea40bf02138c02e7680ce6fa8169502f2a8bd42.

Passes with https://github.com/llvm/llvm-project/issu

Reapply "[libc++] Explicitly convert to masks in SIMD code (#107983)" (#121352)

This reverts commit 0ea40bf02138c02e7680ce6fa8169502f2a8bd42.

Passes with https://github.com/llvm/llvm-project/issues/121365 fix:
https://lab.llvm.org/buildbot/#/builders/55/builds/4930

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[libc++] Granularize <cstddef> includes (#108696)

Revert "[libc++] Explicitly convert to masks in SIMD code (#107983)"

This reverts commit 1603f99a37c5b179a21dbb8000c39a471a950927.

Reason: buildbot breakage e.g., https://lab.llvm.org/buildbot/#/bu

Revert "[libc++] Explicitly convert to masks in SIMD code (#107983)"

This reverts commit 1603f99a37c5b179a21dbb8000c39a471a950927.

Reason: buildbot breakage e.g., https://lab.llvm.org/buildbot/#/builders/55/builds/2061
llvm-libc++-shared.cfg.in :: std/algorithms/alg.nonmodifying/alg.starts_with/ranges.starts_with.pass.cpp
llvm-libc++-shared.cfg.in :: std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
llvm-libc++-shared.cfg.in :: std/algorithms/alg.nonmodifying/mismatch/ranges_mismatch.pass.cpp
...

(Buildbot re-run passed with the previous revision, 1fc288bf481726393c73133eef9aa73c0f78312e)

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[libc++] Explicitly convert to masks in SIMD code (#107983)

This makes it clearer when we use masks and avoids MSan complaining.

[libc++][NFC] Use [[__nodiscard__]] unconditionally (#80454)

`__has_cpp_attribute(__nodiscard__)` is always true now, so we might as
well replace `_LIBCPP_NODISCARD`. It's one less macro that can r

[libc++][NFC] Use [[__nodiscard__]] unconditionally (#80454)

`__has_cpp_attribute(__nodiscard__)` is always true now, so we might as
well replace `_LIBCPP_NODISCARD`. It's one less macro that can result in
bad diagnostics.

show more ...

[libc++] Fix endianness for algorithm mismatch (#93082)

This PR is required to fix
`std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp` test for
big endian platrofrms such as z/OS.

[libc++][z/OS] Correct a definition of __native_vector_size (#91995)

Fix `std/ranges/range.adaptors/range.lazy.split/general.pass.cpp` which
started failing on z/OS after this
[commit](https://git

[libc++][z/OS] Correct a definition of __native_vector_size (#91995)

Fix `std/ranges/range.adaptors/range.lazy.split/general.pass.cpp` which
started failing on z/OS after this
[commit](https://github.com/llvm/llvm-project/commit/985c1a44f8d49e0af).

This test case is passing on other platforms such as AIX. This is
because the `__ALTIVEC__` macro is defined and `__mismatch` under
`_LIBCPP_VECTORIZE_ALGORITHMS` guard is compiled out. However, on z/OS
`_LIBCPP_VECTORIZE_ALGORITHMS` is defined. Analyzing the algorithm of
`__mismatch` shows that the culprit is the definition of
`__native_vector_size` which was defined wrongly as 1. This PR corrects
the definition of `__native_vector_size` and fixes the affected test.

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[libc++] Vectorize std::mismatch with trivially equality comparable types (#87716)

[libc++] Removes Clang-16 support. (#87810)

With the release of Clang-18 we no longer officially support Clang-16.

[libc++] Optimize the two range overload of mismatch (#86853)

```
-----------------------------------------------------------------------------
Benchmark

[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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[libc++] Vectorize mismatch (#73255)

```
---------------------------------------------------
Benchmark old new
--------------------------------------------------

[libc++] Vectorize mismatch (#73255)

```
---------------------------------------------------
Benchmark old new
---------------------------------------------------
bm_mismatch<char>/1 0.835 ns 2.37 ns
bm_mismatch<char>/2 1.44 ns 2.60 ns
bm_mismatch<char>/3 2.06 ns 2.83 ns
bm_mismatch<char>/4 2.60 ns 3.29 ns
bm_mismatch<char>/5 3.15 ns 3.77 ns
bm_mismatch<char>/6 3.82 ns 4.17 ns
bm_mismatch<char>/7 4.29 ns 4.52 ns
bm_mismatch<char>/8 4.78 ns 4.86 ns
bm_mismatch<char>/16 9.06 ns 7.54 ns
bm_mismatch<char>/64 31.7 ns 19.1 ns
bm_mismatch<char>/512 249 ns 8.16 ns
bm_mismatch<char>/4096 1956 ns 44.2 ns
bm_mismatch<char>/32768 15498 ns 501 ns
bm_mismatch<char>/262144 123965 ns 4479 ns
bm_mismatch<char>/1048576 495668 ns 21306 ns
bm_mismatch<short>/1 0.710 ns 2.12 ns
bm_mismatch<short>/2 1.03 ns 2.66 ns
bm_mismatch<short>/3 1.29 ns 3.56 ns
bm_mismatch<short>/4 1.68 ns 4.29 ns
bm_mismatch<short>/5 1.96 ns 5.18 ns
bm_mismatch<short>/6 2.59 ns 5.91 ns
bm_mismatch<short>/7 2.86 ns 6.63 ns
bm_mismatch<short>/8 3.19 ns 7.33 ns
bm_mismatch<short>/16 5.48 ns 13.0 ns
bm_mismatch<short>/64 16.6 ns 4.06 ns
bm_mismatch<short>/512 130 ns 13.8 ns
bm_mismatch<short>/4096 985 ns 93.8 ns
bm_mismatch<short>/32768 7846 ns 1002 ns
bm_mismatch<short>/262144 63217 ns 10637 ns
bm_mismatch<short>/1048576 251782 ns 42471 ns
bm_mismatch<int>/1 0.716 ns 1.91 ns
bm_mismatch<int>/2 1.21 ns 2.49 ns
bm_mismatch<int>/3 1.38 ns 3.46 ns
bm_mismatch<int>/4 1.71 ns 4.04 ns
bm_mismatch<int>/5 2.00 ns 4.98 ns
bm_mismatch<int>/6 2.43 ns 5.67 ns
bm_mismatch<int>/7 3.05 ns 6.38 ns
bm_mismatch<int>/8 3.22 ns 7.09 ns
bm_mismatch<int>/16 5.18 ns 12.8 ns
bm_mismatch<int>/64 16.6 ns 5.28 ns
bm_mismatch<int>/512 129 ns 25.2 ns
bm_mismatch<int>/4096 1009 ns 201 ns
bm_mismatch<int>/32768 7776 ns 2144 ns
bm_mismatch<int>/262144 62371 ns 20551 ns
bm_mismatch<int>/1048576 254750 ns 90097 ns
```

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