[pythran] Re: cx-limited-range
- From: Mehdi AMINI <joker.eph@xxxxxxxxx>
- To: pythran@xxxxxxxxxxxxx
- Date: Fri, 14 Nov 2014 13:28:35 -0800
On 11/14/14, 1:23 PM, serge Guelton wrote:
On Fri, Nov 14, 2014 at 12:02:15PM -0800, Mehdi AMINI wrote:
Hi,
from pythran/pythonic/patch/README.rst
"""
The implementation of std::complex is very slow, due to the complex limited
range (see `-fcx-limited-range`) feature. Numpy does not implement it, so we
have to conform to numpy's version.
"""
Let's focus on the multiplication.
Are you kidding, I explicitly linked the Python division implementation!
So, Python/Numpy behavior and C++ behavior are different with respect to
complex multiplication. What we did is provide a std::complex<T> that
match Python/Numpy behavior. We cannot ask nt2 to follow numpy's
behvaior, so... we hijacked std::complex :-/
You have to ask NT2 to be able to supply your own complex
implementation, hijacking std::complex is a no-no! (non standard I assume)
Mehdi
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