[all-commits] [llvm/llvm-project] af57ad: [libc++][z/OS] Correct a definition of __native_ve...

[zibi2 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: af57ad6536c7df19e6df7217d9d976067fdaf882
      https://github.com/llvm/llvm-project/commit/af57ad6536c7df19e6df7217d9d976067fdaf882
  Author: zibi2 <62662650+zibi2 at users.noreply.github.com>
  Date:   2024-05-16 (Thu, 16 May 2024)

  Changed paths:
    M libcxx/include/__algorithm/simd_utils.h

  Log Message:
  -----------
  [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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