[issue12973] int_pow() implementation is incorrect

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 07efe83795b0 by Mark Dickinson in branch '2.7':
Issue #12973: Fix int.__pow__ overflow checks that invoked undefined behaviour, thereby producing incorrect results on Clang.
http://hg.python.org/cpython/rev/07efe83795b0

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nosy: +python-dev

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