> On Apr 24, 2016, at 6:08 PM, Xiaodi Wu via swift-evolution > <[email protected]> wrote: > > Something else to consider if you insist that all floating point values must > be "orderable" would be how two NaNs are ordered if they have different > payloads. As far as I'm aware, that goes beyond what IEEE 754 has to say > about total ordering of floating point values.
The IEEE 754 totalOrder predicate is an honest-to-god total order on all canonical members of a format (this includes ordering all NaNs by sign, signalingness, and payload). – Steve
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