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To further clarify: IEEE 754 calls the process of signaling “raising an exception” and “exception handling", but this is not what anyone else means by “exception”. Under “default exception handling”—what the llvm instructions assume—it is just setting a sticky bit in a status register that you cannot even read under the assumptions of the llvm instructions, hence operations on sNaN are

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> > - Because LLVM reorders and speculates the instruction forms, and because IEEE defines the corresponding IEEE operations as trapping on SNaNs, it is clear that SNaNs are outside of the domain of these LLVM operations. Either