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Introduction

Gnu Mpc is a C library for the arithmetic of complex numbers with arbitrarily high precision and correct rounding of the result. It extends the principles of the IEEE-754 standard for fixed precision real floating point numbers to complex numbers, providing well-defined semantics for every operation. At the same time, speed of operation at high precision is a major design goal.

The library is built upon and follows the same principles as Gnu Mpfr. It is written by Andreas Enge, Mickaël Gastineau, Philippe Théveny and Paul Zimmermann and is distributed under the Gnu Lesser General Public License, either version 3 of the licence, or (at your option) any later version. The Gnu Mpc library has been registered in France by the Agence pour la Protection des Programmes on 2003-02-05 under the number IDDN FR 001 060029 000 R P 2003 000 10000.

News

Version 1.0.1, "Fagus silvatica", released in September 2012, comes with the following bug fixes:

• Switched to automake 1.11.6, see CVE-2012-3386
• #14669: Fixed extraction of CC from gmp.h
• Fixed case of intermediate zero real or imaginary part in mpc_fma, found by hydra with GMP_CHECK_RANDOMIZE=1346362345

Version 1.0, "Fagus silvatica", released in July 2012, comes with the following new features:

• First release as a Gnu package
• Licence change towards LGPLv3+ for the code and GFDLv1.3+ (with no invariant sections) for the documentation
• 100% of all lines are covered by tests
• Renamed functions
  • mpc_mul_2exp to mpc_mul_2ui
  • mpc_div_2exp to mpc_div_2ui
• 0^0, which returned (NaN,NaN) previously, now returns (1,+0)
• Removed compatibility with K&R compilers, which was untestable due to lack of such compilers
• New functions
  • mpc_log10
  mpc_mul_2si, mpc_div_2si
• Speed-ups
  • mpc_fma
• Bug fixes
  • mpc_div and mpc_norm now return a value indicating the effective rounding direction, as the other functions
  • mpc_mul, mpc_sqr and mpc_norm now return correct results even if there are over- or underflows during the computation
  • mpc_asin, mpc_proj, mpc_sqr: Wrong result when input variable has infinite part and equals output variable is corrected
  • mpc_fr_sub: Wrong return value for imaginary part is corrected

The second Mpfr/Mpc developer meeting has been held in Bordeaux from June 25 to 27, 2012.

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