[PATCH] D53919: [X86] Don't allow illegal vector types to return by direct value on x86-64.

[Eli Friedman via Phabricator via cfe-commits]

efriedma added a comment.

The ABI document before AVX was introduced didn't say anything at all about 256-bit vectors.  So we're talking about compatibility with some other compiler.  Which compiler?


Repository:
  rC Clang

https://reviews.llvm.org/D53919