#16453: Cythonize quiver paths
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Reporter: SimonKing | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.4
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/ticket/16453 | e03b66156f5b5212bfeffc937887ae5c29a1a6ca
Dependencies: #15820 | Stopgaps:
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Comment (by SimonKing):
Replying to [comment:79 jdemeyer]:
> And since `_start` and `_end` are C ints, you might as well replace
> {{{
> cdef mp_limb_t h = (hash(self._start)<<4)^hash(self._end)
> }}}
> by something like
> {{{
> cdef Py_hash_t h = self._start*(<Py_hash_t>1073807360) + self._end
> }}}
> (note that hashes should use `Py_hash_t` as type)
Never heard of `Py_hash_t` before---I thought the hash is just a `long`. I
guess you are right that the multiplication with a large number yields a
better hash (by mixing the data) than a simple shift.
--
Ticket URL: <http://trac.sagemath.org/ticket/16453#comment:80>
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