mini-gmp and mpq

[Marc Glisse]

On Tue, 27 Feb 2018, Marco Bodrato wrote:

> The realway to speed-up that loop is to use the suggestion in gmpxx.h to
> compute a rational+1, both for mini-gmp and the full GMP library:
>
> struct __gmp_unary_increment
> {
>  static void eval(mpz_ptr z) { mpz_add_ui(z, z, 1); }
>  static void eval(mpq_ptr q)
>  { mpz_add(mpq_numref(q), mpq_numref(q), mpq_denref(q)); }
>  static void eval(mpf_ptr f) { mpf_add_ui(f, f, 1); }
> };

If I write q = 1 + 1 / q, gmpxx currently generates:
mpq_inv(q, q);
mpz_addmul_ui(num, den, 1);

Not quite optimal yet :-(

-- 
Marc Glisse