For completeness, here's the regression tests from the conrttrib modules. I haven't looked into why earthdistance is coming up with such odd results but I suspect it all comes from the same arithmetic source. I don't see any surprising internal dependencies on ieee floating point.
For what it's worth there are a number of mentions in the docs of platforms that have non-ieee semantics behaving differently so I wouldn't say we don't support such platforms. If we could avoid the test failures without weakening the tests for other platforms that would be nice. But I don't see any obvious way to do that.
regression-contrib.diffs
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