#4982: consolidate shifts in polynomial_template
---------------------------+------------------------------------------------
Reporter: robertwb | Owner: tbd
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.3
Component: algebra | Keywords:
Work_issues: | Author: Alex Ghitza
Reviewer: | Merged:
---------------------------+------------------------------------------------
Comment(by malb):
Alex and I were discussing this off-list. The speedup patch does the
following:
* added a new C function which all methods call now
* I inlined it
* and I changed the code to avoid some initialisation
Here is what I got:
'''Vanilla:'''
{{{
sage: P.<x> = GF(2)[]
sage: f = P.random_element(50)
sage: %timeit f<<50
1000000 loops, best of 3: 730 ns per loop
}}}
'''Patch:'''
{{{
sage: P.<x> = GF(2)[]
sage: f = P.random_element(50)
sage: %timeit f<<50
1000000 loops, best of 3: 1.06 µs per loop
}}}
'''Patch + Speed-up:'''
{{{
sage: P.<x> = GF(2)[]
sage: %timeit f<<50
1000000 loops, best of 3: 761 ns per loop
}}}
So there is still some overhead, but I think its acceptable.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4982#comment:7>
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