#18215: Huge speed up for hash of quadratic number field elements
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: number fields | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/18215 | 3ec20b4245a23f27931b00e54256743709e38e18
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:8 ncohen]:
> Hello,
>
> Can you tell where this `42082631` comes from?
This is to avoid conflicts for small values of `a` and `b`. It avoids
conflicts between `a=1, b=-1` and `a=b=0`.
> Also, is it true that `mpz_pythonhash(self.b)` is zero when `self.b` is
0 ?
Yes. This is the same algorithm as Python hash for `int/long`.
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Ticket URL: <http://trac.sagemath.org/ticket/18215#comment:9>
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