#17819: Use unsigned long for Integer.divisors
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-6.6
Component: c_lib | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/17819 | 3bc79b71b49aa37b7307174f29e228a6c2bc81f6
Dependencies: #17794, #10257 | Stopgaps:
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Description changed by jdemeyer:
Old description:
> The `divisors` method of `Integer` is implemented using `long long` if
> possible. However, it would be better to use `unsigned long` for this.
> One advantage is that we no longer need the `mpz_set_longlong()`
> functions from `c_lib`. This will also be faster for small inputs on
> 32-bit systems.
New description:
The `divisors` method of `Integer` is implemented using `long long` if
possible. However, it would be better to use `unsigned long` for this. One
advantage is that we no longer need the `mpz_set_longlong()` functions
from `c_lib`. This will also be faster for small inputs on 32-bit systems.
On 64-bit systems, there should be no speed difference (except perhaps a
small speed-up due to skipping the `mpz_longlong` overhead and the fact
that we use 64 instead of 63 bits).
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Ticket URL: <http://trac.sagemath.org/ticket/17819#comment:22>
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