Announce: GNU MPFR 3.0.0 is released

Vincent Lefevre vincent at
Thu Jun 10 14:37:26 CEST 2010

GNU MPFR 3.0.0 ("boudin aux pommes") is now available for download
from the MPFR web site:

from INRIAGForge:

and from the GNU FTP site:

Thanks very much to those who sent us bug reports and/or tested
the release candidates.

The MD5's:
f45bac3584922c8004a10060ab1a8f9f  mpfr-3.0.0.tar.bz2
2458a1616f05b7f04f049de2d209c6a7  mpfr-3.0.0.tar.gz
8ab3bef2864b8c6e6a291f5603141bbd  mpfr-3.0.0.tar.xz

Changes from versions 2.4.* to version 3.0.0:
- MPFR 3.0.0 is binary incompatible with previous versions but (almost)
  API compatible.  More precisely the obsolete functions mpfr_random
  and mpfr_random2 have been removed, the meaning of the return type
  of the function mpfr_get_f has changed, and the return type of the
  function mpfr_get_z is now int instead of void.  In practice, this
  should not break any existing code.
- MPFR is now distributed under the GNU Lesser General Public License
  version 3 or later (LGPL v3+).
- Rounding modes GMP_RNDx are now MPFR_RNDx (GMP_RNDx kept for
- A new rounding mode (MPFR_RNDA) is available to round away from zero.
- The rounding mode type is now mpfr_rnd_t (as in previous versions,
  both mpfr_rnd_t and mp_rnd_t are accepted, but mp_rnd_t may be
  removed in the future).
- The precision type is now mpfr_prec_t (as in previous versions, both
  mpfr_prec_t and mp_prec_t are accepted, but mp_prec_t may be removed
  in the future) and it is now signed (it was unsigned in MPFR 2.*, but
  this was not documented). In practice, this change should not affect
  existing code that assumed nothing on the precision type.
- MPFR now has its own exponent type mpfr_exp_t, which is currently
  the same as GMP's mp_exp_t.
- Functions mpfr_random and mpfr_random2 have been removed.
- mpfr_get_f and mpfr_get_z now return a ternary value.
- mpfr_strtofr now accepts bases from 37 to 62.
- mpfr_custom_get_mantissa was renamed to mpfr_custom_get_significand
  (mpfr_custom_get_mantissa is still available via a #define).
- Functions mpfr_get_si, mpfr_get_ui, mpfr_get_sj, mpfr_get_uj,
  mpfr_get_z and mpfr_get_z_2exp no longer have cases with undefined
  behavior; in these cases, the behavior is now specified, and in
  particular, the erange flag is set.
- New functions mpfr_buildopt_tls_p and mpfr_buildopt_decimal_p giving
  information about options used at MPFR build time.
- New function mpfr_regular_p.
- New function mpfr_set_zero.
- New function mpfr_digamma.
- New function mpfr_ai (incomplete, experimental).
- New functions mpfr_set_flt and mpfr_get_flt to convert from/to the
  float type.
- New function mpfr_urandom.
- New function mpfr_set_z_2exp (companion to mpfr_get_z_2exp, which
  was renamed from mpfr_get_z_exp in previous versions).
- Speed improvement for large operands in the trigonometric functions
  (mpfr_sin, mpfr_cos, mpfr_tan, mpfr_sin_cos): speedup of about 2.5
  for 10^5 digits, of about 5 for 10^6 digits.
- Speed improvement for large operands of the inverse trigonometric
  functions (arcsin, arccos, arctan): about 2 for 10^3 digits, up to
  2.7 for 10^6 digits.
- Some documentation files are installed in $docdir.
- The detection of a GMP build directory (more precisely, the internal
  header files of GMP) was previously done separately from the use of
  the --with-gmp-build configure option. This was not consistent with
  the documentation and with other parts of the configure script. So,
  as of MPFR 3.0.0, the internal header files of GMP are now used if
  and only if the --with-gmp-build configure option is given.
- The configure script recognizes some extra "long double" formats
  (double big endian, double little endian, double-double big endian).
- MPFR manual: added "API Compatibility" section.
- Test coverage: 97.1% lines of code.
- Bug fixes.

You can send success and failure reports to <mpfr at>, and give
us the canonical system name (by running the "./config.guess" script),
the processor and the compiler version, in order to complete the
"Platforms Known to Support MPFR" section of the MPFR 3.0.0 web page.


Vincent Lefèvre <vincent at> - Web: <>
100% accessible validated (X)HTML - Blog: <>
Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)

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