MPFR version 2.1.2 (released on 3 August 2005)

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MPFR 2.1.2 requires GMP 4.1.0 or higher. This is the latest version of the 2.1 branch, which is no longer supported (newly discovered bugs will probably never be fixed on this branch). Please upgrade to MPFR 2.2.0 (or higher, when new versions are released).


MPFR 2.1.2 can be downloaded in the following archive formats:

The signatures can be checked with Laurent Fousse's key (or grab this key A1696D2B from the keyserver

MPFR is also available as the official Debian package libmpfr-dev.



Fixed bug: exp(-eps) is somtimes wrong when rounding toward zero (the test is also wrong). This is fixed by the mpfr_exp patch (with updated tests).

In addition to the bugs mentioned in the BUGS file:

The following bugs are present in MPFR 2.1.2, but are fixed in the 2.2 branch and above:

Changes from version 2.1.1 to version 2.1.2

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