https://bugs.llvm.org/show_bug.cgi?id=51488

            Bug ID: 51488
           Summary: Add neon_cnt  and neon_addv8 for 64-bit ARM for parity
                    with MSVC
           Product: clang
           Version: 12.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected]

Hello.
I started to work on popcount optimization on ARM64:
https://github.com/microsoft/STL/pull/2127
and I found linking errors with clang-cl.
Could you provide neon_cnt and neon_addv8? (Also neon_cntq, neon_addvq8 for
future optimizing bitset:
https://github.com/microsoft/STL/issues/2129#issuecomment-899300269)

```
__n64  neon_cnt(__n64);
__n128 neon_cntq(__n128);
__n8  neon_addv8(__n64);
__n8  neon_addvq8(__n128);
```

Or do you already provide similar intrinsics with different names?
I am slightly worried that they are not _Ugly.
So maybe I should ask Microsoft as well, maybe they should rename it if you
already have it with suitable names...

I used Windows 10 x86-64, Visual Studio 2022 Preview 3, Clang 12 from Visual
Studio.

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