[pythran] gmp
- From: Brunet Pierrick <pierrick.brunet@xxxxxxxxxxxxxxxxxxx>
- To: pythran@xxxxxxxxxxxxx
- Date: Sat, 27 Oct 2012 15:54:45 +0200
Hi,
About last commit, I did some modification as I never tested to use a
long as pythran input specification. In the code, we need to use
mpz_class as a constructed type to have a correct behaviour.
Also, I fix another issue un the conversion from pylong to mpz_class.
I tested the code below and get an error:
#export pythran test(long)
def test(a)
for i in xrange(a):
...
Because xrange doesn't support long as input parameter. It looks like
python doesn't support either.
About profiling, I did some test using the binamial law with : 10 by 60.
Result look good and we have almost the same ratio with others numbers.
I just need to find some others bench
In [4]: %timeit test1.test(10,60)
100000 loops, best of 3: 5.26 us per loop
In [5]: %timeit test2.test(10,60)
100000 loops, best of 3: 5.32 us per loop
In [6]: %timeit test3.test(10,60)
100000 loops, best of 3: 11.5 us per loop
Finally, we have another error now:
if we define a long num : a = 1111111111111L
and add a float: b = a +2.5
the result is b = 1111111111113L
Pythran doesn't care about the value after the point.
Issue comme from Assignable specification but we can't do this in
another way as gmp have some limitation about Templates :
http://gmplib.org/manual/C_002b_002b-Interface-Limitations.html#C_002b_002b-Interface-Limitations
The solution can be to concidere long as mpf_class instead of mpz_class.
But if we keep the same precision, we will lose some performance.
Have a good week end.
Other related posts:
