#19797: Build GSL in IEEE 754 compliant mode
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.0
Component: packages: | Resolution:
standard | Merged in:
Keywords: | Reviewers:
Authors: Jeroen Demeyer | Work issues:
Report Upstream: Reported | Commit:
upstream. Developers acknowledge | 694feb2d71ebf521cf5f32dba69e0406d16e9f11
bug. | Stopgaps:
Branch: |
u/jdemeyer/ticket/19797 |
Dependencies: #19796 |
-------------------------------------+-------------------------------------
Changes (by rws):
* upstream: N/A => Reported upstream. Developers acknowledge bug.
Old description:
> The following can happen on some hardware architectures due to fused
> multiply-add instructions:
> {{{
> sage: x = CDF(0.99, 0.2)
> sage: x * x.conj()
> 1.0201 + 1.1102230246251575e-19*I
> }}}
>
> It's annoying because it causes doctest failures, for example
> {{{
> sage -t --long --warn-long 62.3 src/sage/symbolic/expression.pyx
> **********************************************************************
> File "src/sage/symbolic/expression.pyx", line 11105, in
> sage.symbolic.expression.Expression._plot_fast_callable
> Failed example:
> plot(s)
> Expected:
> Graphics object consisting of 1 graphics primitive
> Got:
> Graphics object consisting of 0 graphics primitives
> **********************************************************************
> }}}
New description:
The following can happen on some hardware architectures due to fused
multiply-add instructions:
{{{
sage: x = CDF(0.99, 0.2)
sage: x * x.conj()
1.0201 + 1.1102230246251575e-19*I
}}}
It's annoying because it causes doctest failures, for example
{{{
sage -t --long --warn-long 62.3 src/sage/symbolic/expression.pyx
**********************************************************************
File "src/sage/symbolic/expression.pyx", line 11105, in
sage.symbolic.expression.Expression._plot_fast_callable
Failed example:
plot(s)
Expected:
Graphics object consisting of 1 graphics primitive
Got:
Graphics object consisting of 0 graphics primitives
**********************************************************************
}}}
See https://github.com/pynac/pynac/issues/117
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19797#comment:11>
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 https://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
