#19040: defuse bool(x!=0) performance bomb
-------------------------------+------------------------
Reporter: rws | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.9
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
-------------------------------+------------------------
Comment (by rws):
Replying to [comment:1 vdelecroix]:
> ` if not x:`
`bool(not x)` calls `PyObject_IsTrue` which calls `Expression.__nonzero__`
which atm tries to prove that `x` is nonzero
> or with `not x` replaced by `x.is_zero()`.
This calls `PyObject_IsTrue` as well.
> So this change would also implies to change all of these in a uniform
way.
Right, `Expression.__nonzero__` will then call `x.is_trivial_zero()` and
everyone who wants a proof needs a dfferent method.
--
Ticket URL: <http://trac.sagemath.org/ticket/19040#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
