[llvm-bugs] [Bug 28963] AVX512: Update __vectorcall calling conventions

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28963

David Majnemer <david.majnemer at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |david.majnemer at gmail.com
         Resolution|---                         |INVALID

--- Comment #1 from David Majnemer <david.majnemer at gmail.com> ---
Clang's __vectorcall is an implementation of an MSVC calling convention.

Our implementation of __vectorcall must be compatible with theirs or else we
risk violating the ABI.

Microsoft's documentation does not say that __m512 objects participate in the
__vectorcall ABI: https://msdn.microsoft.com/en-us/library/dn375768.aspx

Please feel free to reopen if you can show that Clang's behavior is
incompatible with MSVC's with respect to __m512.

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