Zimmermann Paul <paul.zimmerm...@inria.fr> writes: Moreover GMP is using Schönhage-Strassen's algorithms, where the pointwise multiplications are not negligible, thus we should have a ratio well above 2/3. However in GMP 5.1.3 the ratio is around 2/3, and sometimes even below: Any explanation? I can speculate, at least.
A significant fraction of the point-wise products' time will be spent in mpn_mul_basecase/mpn_sqr_basecase. The time ration for those is close to 1/2. This ratio seems to be reflected in toom functions. It is also possible that cache effects play a part; squaring will have slightly better spatial and temporal locality. -- Torbjörn _______________________________________________ gmp-devel mailing list gmp-devel@gmplib.org http://gmplib.org/mailman/listinfo/gmp-devel
