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On 5 Oct 2010, at 16:48, Arnold Neumaier wrote: > The current exception handling for directed rounding is simply not > well designed; maybe the few existing applications that use it in > the exceptional range also have to work around these inefficiencies. I agree. As for your Q, I see nothing in the IEEE754-2008 conformance rules that forbids providing new modes, as long as the existing ones are kept. John Pryce