No subject

\item If the size of an object is larger than four \eightbytes, or
  it contains unaligned fields, it has class MEMORY

struct m512i has size of 64 bytes, which is larger than 8*4=32, so it has class
MEMORY and passed on the stack.

It looks like everything is according to ABI.
>From 
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/60204] struct with __m512i is mishandled in function parameter passing and return
Date: Tue, 18 Feb 2014 12:26:00 +0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60204

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