[PATCH] D28335: [WIP] [RFC] Don't lower floating point intrinsics to libcalls which modify errno

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> I know. I posted an RFC at some point where I detailed how errno is implemented across a wide range of implementations. It is nasty, at least in theory, but practically, it is not as bad as you might fear.

http://lists.llvm.org/pipermail/llvm-dev/2013-November/068154.html ? It looks like the conclusion was actually that it's worse than that: matherr() exists on both glibc and MSVC, which means sqrt(-1) can do anything.


Repository:
  rL LLVM

https://reviews.llvm.org/D28335