[llvm-bugs] [Bug 28963] AVX512: Support passing ZMM vectors via registers (via __regcall or other calling convention)

[via llvm-bugs]

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

Wenzel Jakob <wenzel.jakob at epfl.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Wenzel Jakob <wenzel.jakob at epfl.ch> ---
(In reply to comment #3)
> > 1. GCC does this by default, even without specifying specific calling
> > conventions. (!). This is ideal from a performance perspective albeit
> > perhaps a bit unorthodox.
> 
> This is a serious compatibility problem, it means that we aren't doing the
> right thing.  Please file a bug showing clang performing a parameter access
> via an inappropriate register (while showing what GCC does).

That's a good point -- thank you for clarifying. I've opened another ticket
about that (Bug 28975) and will close this ticket then.

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