[issue12080] decimal.py: performance in _power_exact

Stefan Krah added the comment: Mark Dickinson wrote: > Here's a patch. Stefan, could you please review? Mark, sorry for not replying earlier. The patch looks great. I've also tested the patch in practice: I ran 700,000,000 random tests with an exponent range of [-9, 9]. This t

[issue12080] decimal.py: performance in _power_exact

Mark Dickinson added the comment: Fixed for 3.3 and 2.7. -- resolution: -> fixed status: open -> closed ___ Python tracker ___ ___ P

[issue12080] decimal.py: performance in _power_exact

Roundup Robot added the comment: New changeset 78d79499e7de by Mark Dickinson in branch '2.7': Issue #12080: Fix a performance issue in Decimal._power_exact that caused some corner-case Decimal.__pow__ calls to take an unreasonably long time. http://hg.python.org/cpython/rev/78d79499e7de -

[issue12080] decimal.py: performance in _power_exact

Roundup Robot added the comment: New changeset c3fe54781244 by Mark Dickinson in branch 'default': Issue #12080: Fix a performance issue in Decimal._power_exact that causes some corner-case Decimal.__pow__ calls to take an unreasonably long time. http://hg.python.org/cpython/rev/c3fe54781244 -

[issue12080] decimal.py: performance in _power_exact

Mark Dickinson added the comment: Here's a slightly improved version that adds guards against computing 10**ye for large ye in the case y < 0, ye > 0. -- Added file: http://bugs.python.org/file22069/issue12080_v2.patch ___ Python tracker

[issue12080] decimal.py: performance in _power_exact

Changes by Mark Dickinson : -- stage: -> commit review ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: http://

[issue12080] decimal.py: performance in _power_exact

Mark Dickinson added the comment: Here's a patch. Stefan, could you please review? -- keywords: +patch Added file: http://bugs.python.org/file22068/issue12080.patch ___ Python tracker _

[issue12080] decimal.py: performance in _power_exact

Changes by STINNER Victor : -- nosy: +haypo ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.

[issue12080] decimal.py: performance in _power_exact

Changes by Raymond Hettinger : -- nosy: +rhettinger ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail

[issue12080] decimal.py: performance in _power_exact

Mark Dickinson added the comment: Thanks for the report; I'll try to find some time to look at this. This isn't the first time that I've thought that it might be better just to abandon the aim of getting correctly-rounded results for pow. -- assignee: -> mark.dickinson

[issue12080] decimal.py: performance in _power_exact

New submission from Stefan Krah : I found another performance issue in _power_exact: >>> Decimal(4) ** Decimal("-1.2e-9") ^CTraceback (most recent call last): File "", line 1, in File "/home/stefan/pydev/cpython/Lib/decimal.py", line 2343, in __pow__ ans = self._power_exact(othe