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On Mar 3, 2018, at 15:54, Chris Lattner <clattner at nondot.org> wrote: >> On Mar 2, 2018, at 8:31 AM, Stephen Canon <scanon at apple.com> wrote: >> >> Thanks for expanding, Chris. Responses inline. >> >>>> On Mar 2, 2018, at 12:32 AM, Chris Lattner via llvm-dev <llvm-dev at lists.llvm.org> wrote: >>> >>> <snip>

...1” to fold to undef, right? > > Yes, indeed. Great! Can someone please update LangRef so we codify this for the next time I forget? :-) -Chris -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180304/8b8fd625/attachment.html>

So you don’t think sNaNs can just be treated as if they were qNaNs? I understand why we would want to ignore the signaling part of things, but the rules for operating on NaNs are pretty clear and reasonable to implement. The signaling aspect can, I think, be safely ignored when we are in the mode of assuming the default FP environment. As for the distinction between IEEE and LLVM IR, I would