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Postings from December 2017
Niko Tyni wrote: >I assume the 128-bit long doubles on this platform are actually a sum of >two 64-bit doubles, which "does not conform to the IEEE floating-point >standard" [1] and "has serious arithmetic anomalies" [2]. > >If this something that can not be supported, perhaps Configure should >detect such a platform and disable the longdouble setting or error out? A double-double format *can* be well-behaved, if its two halves are constrained to have a fixed exponent difference and all the edge cases are handled properly. I concur that we should detect the badly-behaved ones and reject their use. Can someone offer me an account on one of these PowerPC Linux systems with the suspect long double? Having never experienced a double-double system before, I'd like to experiment to see exactly where the numeric semantics break down, and thus how to efficiently detect the problem. -zeframThread Next