Re: [PPL-devel] mpz_addmul_ui with ui = 1

On 2009-02-03 08:06:44 +0100, Paul Zimmermann wrote:

   Dear Roberto,

...

// FIXME(0.10.1): the test seems to speed up the GMP computation. if (tableau_ij != 0) { scalar_value = tableau_ij * norm_factor[i]; add_mul_assign(challenger_den, scalar_value, scalar_value); }

inline void add_mul_assign(GMP_Integer& x, const GMP_Integer& y, const GMP_Integer& z) { mpz_addmul(x.get_mpz_t(), y.get_mpz_t(), z.get_mpz_t()); }

I'm ignorant about C++, but maybe the speedup you observe is due to the scalar_value = tableau_ij * norm_factor[i] instruction which is not done any more (which types have scalar_value, tableau_ij and norm_factor[i] ?),

But for the other test, there is no such assignment.