[PATCH] MPI helper of comparison, Least Leak Intended

[NIIBE Yutaka]

NIIBE Yutaka <gniibe at fsij.org> wrote:
> Jussi Kivilinna <jussi.kivilinna at iki.fi> wrote:
>>    int
>>    _gcry_mpih_cmp_lli (mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size)
>>    {
>>      mpi_size_t i;
>>      mpi_limb_t res_gt = 0;
>>      mpi_limb_t res_lt = 0;
>>
>>      for (i = 0; i < size ; i++)
>>        {
>>          mpi_limb_t gt, lt, eq, neq;
>>          gt = mpih_ct_limb_greater_than (up[i], vp[i]);
>>          lt = mpih_ct_limb_less_than (up[i], vp[i]);
>>          neq = ct_limb_gen_mask(gt | lt);
>>          eq = ct_limb_gen_inv_mask(gt | lt);
>>          res_gt = (eq & res_gt) | (neq & gt);
>>          res_lt = (eq & res_lt) | (neq & lt);
>>        }
>>
>>      return (int)(res_gt - res_lt); /* return 0 if U==V, 1 if U>V, -1 if U<V */
>>    }
>
> Please apply and push this version, because it's the way the function
> name suggests (returning -1, 0, 1).

I'm going to push this implementation to master.
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