#18358: a cython function that produces long given python input
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/18358 | 8e9148450538c683d50c89d90acf7457feb0cc03
Dependencies: | Stopgaps:
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Changes (by vdelecroix):
* status: needs_work => needs_review
* commit: => 8e9148450538c683d50c89d90acf7457feb0cc03
* branch: => u/vdelecroix/18358
Comment:
Here is an experimental branch with a macro `pyobject_to_long` in
`sage.misc.long`. I do not like the gestion of error but I do not know how
to do better without affecting performance. Please tell me.
It is used in `Integer.__pow__` and `Rational.__pow__` as a proof of
concept. And we win 20 precious nano seconds when the exponent is a small
Sage Integer (~10%):
{{{
sage: timeit("2**5", number=400000, repeat=20)
400000 loops, best of 20: 248 ns per loop
sage: timeit("(2/3)**2", number=100000, repeat=20)
100000 loops, best of 20: 1.1 µs per loop
}}}
against
{{{
sage: timeit("2**5", number=400000, repeat=20)
400000 loops, best of 20: 228 ns per loop
sage: timeit("(2/3)**2", number=100000, repeat=20)
200000 loops, best of 30: 990 ns per loop
}}}
Vincent
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=524393b4aa89d93d8cc6831480e07c7350c06535
524393b]||{{{Trac 18290: upgrade sets and cartesian products}}}||
||[http://git.sagemath.org/sage.git/commit/?id=6e1e22d1ae7c494773df4b161690d707762558c7
6e1e22d]||{{{Trac 18290: better doc + remove duplications}}}||
||[http://git.sagemath.org/sage.git/commit/?id=671e6ecff8079a28f9b43fda96da29530ba454a8
671e6ec]||{{{Trac 18290: fix doctest in combinat/tutorial}}}||
||[http://git.sagemath.org/sage.git/commit/?id=0378c4a5319972501b1d982c3670085f139c1dd4
0378c4a]||{{{Trac 18290: fix doctest in categories/enumerated_sets.py}}}||
||[http://git.sagemath.org/sage.git/commit/?id=925b2e062bb86212916b73c831f9333f312db4b5
925b2e0]||{{{Trac 18290: fix doctests}}}||
||[http://git.sagemath.org/sage.git/commit/?id=8e9148450538c683d50c89d90acf7457feb0cc03
8e91484]||{{{Trac 18358: macro to cast Python object to C long}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/18358#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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