#12121: floor/ceil can be very slow at integral values
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Reporter: dsm | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.1
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/12121 | 50bdaf3b31aecc326045e48524d2aa4d98186549
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Rebased on what!?
There is one thing I am not happy with. I think we should try to make the
interval much smaller than 1 in
{{{
while x_interval.absolute_diameter() >= 1:
bits *= 2
x_interval = RealIntervalField(bits)(x)
}}}
before trying to simplify the expression. I guess that 2^-30^ would be
much more reasonable and avoid many attempts of (costly) simplification.
What do you think?
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Ticket URL: <http://trac.sagemath.org/ticket/12121#comment:23>
Sage <http://www.sagemath.org>
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