Add ..versionadded for sys.int_info, update py3k version of · pythoncapi/cpython@d72c7b6 · GitHub
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Add ..versionadded for sys.int_info, update py3k version of
whatsnew/2.7.rst to keep it in sync with the trunk version, and replace SHIFT with PyLong_SHIFT in #error message
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‎Doc/library/sys.rst‎

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‎Doc/whatsnew/2.7.rst‎

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@@ -86,6 +86,30 @@ Some smaller changes made to the core Python language are:
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(Contributed by Fredrik Johansson and Victor Stinner; :issue:`3439`.)
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* Integers are now stored internally either in base 2**15 or in base
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2**30, the base being determined at build time. Previously, they
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were always stored in base 2**15. Using base 2**30 gives
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significant performance improvements on 64-bit machines, but
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benchmark results on 32-bit machines have been mixed. Therefore,
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the default is to use base 2**30 on 64-bit machines and base 2**15
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on 32-bit machines; on Unix, there's a new configure option
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--enable-big-digits that can be used to override this default.
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Apart from the performance improvements this change should be
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invisible to end users, with one exception: for testing and
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debugging purposes there's a new structseq ``sys.long_info`` that
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provides information about the internal format, giving the number of
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bits per digit and the size in bytes of the C type used to store
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each digit::
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>>> import sys
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>>> sys.long_info
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sys.long_info(bits_per_digit=30, sizeof_digit=4)
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(Contributed by Mark Dickinson; :issue:`4258`.)
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.. ======================================================================
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‎Include/longintrepr.h‎

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