hjl.tools added a comment.

In https://reviews.llvm.org/D53919#1282692, @efriedma wrote:

> As far as I know, according to the ABI docs, it's impossible to return a 
> 256-bit vector from a function if AVX is disabled.
>
> Given that we aren't rejecting the testcase, we're effectively implementing a 
> new "no-AVX" ABI variant.  That variant is not defined anywhere, so we might 
> as well pick the fastest convention, returning the value in registers.  I'm 
> not sure why you would want to return the vector in memory instead.


Not  a new "no-AVX" ABI variant.  It should be pre-AVX ABI.


Repository:
  rC Clang

https://reviews.llvm.org/D53919



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