Paul Zimmermann Paul.Zimmermann at
Thu May 6 15:34:11 CEST 2010

>   What are the current users of the fraction feature?
> Perhaps MPFR.  Our function mpn/generic/get_str.c passes 1 for the
> fraction argument.

in mpfr_div we currently use mpn_divrem (which interface is exactly what we
need in MPFR, whereas mpn_tdiv_qr would oblige us to allocate an extra limb,
which in most cases will be 0, in contrary with mpfr_div we directly store the
quotient in the result destination).

If mpn_divrem would use that improved div_2 function, MPFR will benefit from


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