[PATCH] D44582: [Builtins] Fix calling long double math functions on x86_64 mingw

[Eli Friedman via Phabricator via cfe-commits]

efriedma added a comment.

The backend has code to generate SRet returns, which is used when TargetLowering::CanLowerReturn returns false.  Probably a tiny change to X86CallingConv.td to use that codepath on Windows.


Repository:
  rC Clang

https://reviews.llvm.org/D44582