Dear all,

While updating MPIR in Sage, we encountered problems with zn_poly (ok it is 
old and unmaintained, but it will need some work before we can get rid of 
it).
See
http://trac.sagemath.org/sage_trac/ticket/13137#comment:70

I see different possibilities:
* bug in GCC,
* problem with the new FFT (I assume what the nuss_mul test does is to 
compare the zn_poly FFT with the GMP/MPIR (just checked, it is indeed)).

Would you mind having a look?
>From what we gathered the problem appears on
* MacOSX using FSF GCC,
* Cygwin on Windows XP
I did not get this problem on a usual 64 bits Ubuntu 12.04.1 with Uguntu 
GCC 4.6.3.

Cheers,
JP

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