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initial import of MPFR 3.1.2. changes since 3.0.1:
- Bug fixes (see <http://www.mpfr.org/mpfr-3.1.1/#fixed> or ChangeLog file). - Bug fixes (see <http://www.mpfr.org/mpfr-3.1.0/#fixed> or ChangeLog file). - TLS support is now detected automatically. If TLS is supported, MPFR is built as thread safe by default. To disable TLS explicitly, configure MPFR with --disable-thread-safe. - The mpfr_urandom and mpfr_urandomb functions now return identical values on processors with different word size (assuming the same random seed, and since the GMP random generator does not depend itself on the word size, cf http://gmplib.org/list-archives/gmp-devel/2010-September/001642.html). - The mpfr_add_one_ulp and mpfr_sub_one_ulp macros (which are obsolete and no more documented) will be removed in a future release. - Speed improvement for the mpfr_sqr and mpfr_div functions using Mulders' algorithm. As a consequence, other functions using those routines are also faster. - Much faster formatted output (mpfr_printf, etc.) with %Rg and similar. - New functions mpfr_buildopt_gmpinternals_p, mpfr_buildopt_tune_case, mpfr_frexp, mpfr_grandom and mpfr_z_sub. - New divide-by-zero exception (flag) and associated functions. - Internal change: the logging mechanism has been improved. - Bug fixes, in particular a huge inefficiency in mpfr_exp (when the target precision is less than MPFR_EXP_THRESHOLD) on hard-to-round cases, which can take several minutes.
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