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> Just define your own rules that are valid on every system; i.e. raise
> an error on an unordered comparison (that's even a requirement in IEC
> 60559). To help math-geeks you could provide C-like "non-signaling"
> methods like isgreater, isgreaterequal, isnan, isnormal, ... in the
> math-lib.

How to implement that in ANSI C?

-- Roberto