Jeff Allen added the comment:
Here is a patch that improves coverage and addresses the uneven accuracy.
Required accuracy is now specified in ulps. Mostly, I have choses 1 ulp, since
this passed for me on an x86 architecture (and also ARM), but this may be too
ambitious.
I have also responded to the comment relating to erfc:
# XXX Would be better to weaken this test only
# for large x, instead of for all x."
I found I could not contribute the code I used to generate the additional test
cases in Tools/scripts without failing test_tools. (It complained of a missing
dependency. The generator uses mpmath.)
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keywords: +patch
Added file: http://bugs.python.org/file42166/iss26040.patch
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