#15820: Improve efficiency of the path semigroup
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Reporter: SimonKing | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.2
Component: algebra | Resolution:
Keywords: quiver path algebra efficiency | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #12630 | Stopgaps:
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Comment (by SimonKing):
I have fixed the problems in [attachment:path_test.pyx].
It was:
1. bitshift by a wrong offset, and
2. the bits that aren't used (e.g., the last 4 bits of an uint64_t when
storing 12 arrows of size 5 bits) should be kept blank.
The latter involves an additional bitwise "and". So, probably the timings
will slightly deteriorate.
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Ticket URL: <http://trac.sagemath.org/ticket/15820#comment:6>
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