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

[H.J Lu via Phabricator via cfe-commits]

hjl.tools added a comment.

In https://reviews.llvm.org/D53919#1282748, @efriedma wrote:

> 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?


X86-64 compilers created before AVX was introduced.   Say clang 1.0 doesn't know AVX and returns it in memory.  So should clang 7.0 with -mno-avx.


Repository:
  rC Clang

https://reviews.llvm.org/D53919