#9887: slow coercion from integer ring to integer mod ring
---------------------------+------------------------------------------------
Reporter: dmharvey | Owner: tbd
Type: defect | Status: needs_review
Priority: major | Milestone:
Component: performance | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
---------------------------+------------------------------------------------
Changes (by roed):
* status: new => needs_review
Comment:
This depends on #7883, #8333, #8334 and #9814. In particular, you first
need to apply
{{{
333_finite_fields_to_new_coercion.patch
7883_ideals.patch
7883_fixes.patch
7585_9_1_frac_and_coerce_updates.patch
8334_residue_fields-rebased_for_8446.patch
7585_12_1_fixes.patch
9814-2.patch
}}}
from those tickets.
On the other hand, it also addresses the speed issues in #9885, #9884,
#9883 and #9882. It should also fix #9886: the timings indicate that
`ZZ.convert_map_from(R)` is getting called each time, rather than the
morphism being found in the `convert_from_hash,` and I don't know why this
would be the case.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9887#comment:1>
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