#6199: Integer * int is slow
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Reporter: fredrik.johansson | Owner: somebody
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.3.2
Component: basic arithmetic | Resolution:
Keywords: | Author:
Upstream: N/A | Reviewer:
Merged: | Work_issues:
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Comment(by robertwb):
Multiplication on the left has less to gain, as it's going to try to call
int.__mul__ before falling back to this code. Do you think it's worth
doubling the general case penalty to support a smaller relative gain?
People who care about timings this small (e.g. mpmath) can follow such
rules, or ideally write Cython directly. I wrote a mode once that was
verbose about all the coercions used, I could resurrect that somewhere for
more easily tracking down stuff like this.
FWIW, I put {{{_mul_long}}} onto ModuleElement, not just RingElement. The
extra indirection needed to put it in coerce.pyx will make it at least 50%
or more slower, probably much more.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6199#comment:10>
Sage <http://www.sagemath.org>
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