Mark Dickinson <dicki...@gmail.com> added the comment: One other thought: we should check that it's not pow that's at fault here, rather than log2. The test uses math.log2(2.0**n). It would probably be better off using math.log2(ldexp(1.0, n)), or similar: the libm pow operation is also notorious for inaccuracies (due to poor implementations or otherwise) on various platforms.
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