#11257: Avoid a coercion when computing an element to the power of 0
---------------------------+------------------------------------------------
Reporter: nborie | Owner: nborie
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: performance | Keywords: coercion, element, power, zero
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Changes (by nborie):
* status: new => needs_review
Comment:
With the patch applied, same tests give:
{{{
sage: K = CyclotomicField(46)
sage: z = K.gen()
sage: %prun z^0
2 function calls in 0.000 CPU seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.000 0.000 <string>:1(<module>)
1 0.000 0.000 0.000 0.000 {method 'disable' of
'_lsprof.Profiler' objects}
sage: %prun z^3
2 function calls in 0.000 CPU seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.000 0.000 <string>:1(<module>)
1 0.000 0.000 0.000 0.000 {method 'disable' of
'_lsprof.Profiler' objects}
}}}
And
{{{
sage: timeit('z^0')
625 loops, best of 3: 1.01 µs per loop
sage: timeit('z^3')
625 loops, best of 3: 7.68 µs per loop
}}}
We will see what the builbot will say. What pass, what crash ....
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11257#comment:1>
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