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CariBlog – Blog on Vincent Lefèvre's Research Pages and Computer Arithmetic

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[2021-04-23 17:06:28 UTC]
Patch 12 for GNU MPFR 4.1.0

(CariBlog – MPFR – Software)

Patch 12 of GNU MPFR 4.1.0 is available in the bugs section of the MPFR 4.1.0 page. It fixes some issues with the mpfr_get_str_ndigits function.

[2021-03-09 18:59:08 UTC]
Patches 10 and 11 for GNU MPFR 4.1.0

(CariBlog – MPFR – Software)

Patches 10 and 11 of GNU MPFR 4.1.0 are available in the bugs section of the MPFR 4.1.0 page. The main bug, fixed by patch 10 (among potential compilation failures in unusual cases): the mpfr_set macro (which, by default, is used in place of the function) evaluates its second argument twice.

[2021-02-19 12:55:57 UTC]
Scheduled Outage Concerning mpfr.org

(CariBlog – MPFR)

Due to power outage, the server hosting mpfr.org will be switched off from Tuesday 23 February 2021, 17:00 CET (16:00 UTC) to Wednesday 24 February 2021, 18:00 CET (17:00 UTC), except unpredictable incident. Only the mpfr.org website will be affected. The MPFR mailing-list and InriaForge will still work.

[2021-02-17 21:28:21 UTC]
Patches 8 and 9 for GNU MPFR 4.1.0

(CariBlog – MPFR – Software)

Patches 8 and 9 of GNU MPFR 4.1.0 are available in the bugs section of the MPFR 4.1.0 page.

[2021-02-11 22:34:12 UTC]
7 Patches for GNU MPFR 4.1.0

(CariBlog – MPFR – Software)

Patches 1 to 7 of GNU MPFR 4.1.0 are available in the bugs section of the MPFR 4.1.0 page.

[2021-01-15 17:54:07 UTC]
Scheduled Outage Concerning mpfr.org

(CariBlog – MPFR)

Happy New Year to everyone!

Due to power outage, the server hosting mpfr.org will be switched off from Friday 22 January 2021, 16:00 CET (15:00 UTC) to Monday 25 January 2021, 10:00 CET (09:00 UTC), except unpredictable incident. Only the mpfr.org website will be affected. The MPFR mailing-list and InriaForge will still work.

[2020-06-13 15:26:21 UTC]
GNU MPFR 4.1.0 Release Candidate

(CariBlog – MPFR – Software)

The GNU MPFR 4.1.0 release candidate is available.

Note that the default CFLAGS value for GCC uses an option that has been introduced in GCC 4.1 (released in 2006). So, if you want to build MPFR with a GCC version less than 4.1, you need to provide an explicit CFLAGS. This issue will be fixed in the final release.

[2020-03-31 20:56:38 UTC]
New Patches for GNU MPFR 4.0.2

(CariBlog – MPFR – Software)

Patches 2 to 6 of GNU MPFR 4.0.2 are available in the bugs section of the MPFR 4.0.2 page. The main ones fix underflow/overflow issues that could be visible with the following functions: mpfr_set_ui_2exp, mpfr_set_si_2exp, mpfr_set_uj_2exp, mpfr_set_sj_2exp, mpfr_fmma, mpfr_fmms, mpfr_fma, mpfr_fms.

[2020-02-12 16:39:01 UTC]
mpfr.org Server Down

(CariBlog – MPFR – Software)

The mpfr.org server is currently down (amongst other virtualized servers, hosted at the same place). This is due to unexpected issues following a maintenance concerning the NAS that was done yesterday (2020-02-11 at 17:00 UTC). We still do not know when the server will be back online.

You can still obtain the GNU MPFR source code from the GNU FTP site and from InriaForge.

[Update] The server is now up.

[2019-11-04 00:30:17 UTC]
Nouvelle page web sur le jeu Neopolis

(vinc17 – Lyon – CariBlog)

J'ai écrit une nouvelle page web sur Neopolis, jeu créé par Ben Kaltenbaek, Roland Lamidieu et Lucas Odion, et lancé à Lyon en mars 2019 sous le nom Metropolis, avant d'être renommé en Neopolis en juillet.

J'y donne des informations en tant que joueur aux 5 parties qui ont eu lieu à Lyon, dont celle en cours depuis le début du mois.

J'y ai aussi ajouté une section sur un bug d'affichage, pour lequel j'ai trouvé une explication probable, liée à une mauvaise méthode de calcul en virgule flottante (les valeurs particulières affectées par ce bug correspondent à mon explication).

[2019-04-04 15:58:16 UTC]
New Paper Accurate Complex Multiplication in Floating-Point Arithmetic

(CariBlog – MPFR)

I have a new paper, written with Jean-Michel Muller: Accurate Complex Multiplication in Floating-Point Arithmetic. It has been accepted at the 26th IEEE Symposium on Computer Arithmetic (ARITH 26), which will take place on 10–12 June 2019 in Kyoto, Japan. Abstract:

We deal with accurate complex multiplication in binary floating-point arithmetic, with an emphasis on the case where one of the operands in a double-word number. We provide an algorithm that returns a complex product with normwise relative error bound close to the best possible one, i.e., the rounding unit u.

For testing, comparisons have been done with the naive algorithm in the binary64 (double precision) and binary128 (quadruple precision) formats, and with implementations based on GNU MPFR, on x86_64 and POWER9 machines (the latter is currently the only processor with hardware binary128 support).

[2019-02-02 22:20:20 UTC]
GNU MPFR 4.0.2 is Released

(CariBlog – MPFR – Software)

The GNU MPFR 4.0.2 library (dinde aux marrons, patch level 2) has been released. In addition to bug fixes, this version corrects the mpfr_get_str description in the manual in order to follow the historical behavior and GMP's mpf_get_str function.

[2019-01-09 17:52:18 UTC]
GNU MPFR 4.0.2 Release Candidate

(CariBlog – MPFR – Software)

[2018-12-31 17:35:32 UTC]
Patch 14 for GNU MPFR 4.0.1

(CariBlog – MPFR – Software)

Patch 14 of GNU MPFR 4.0.1 is available in the bugs section of the MPFR 4.0.1 page. It fixes a bug affecting the mpfr_fmma and mpfr_fmms functions in particular cases: in the round-to-nearest mode (MPFR_RNDN), these functions can round in the wrong direction due to a double rounding in the computation.

[2018-07-31 15:57:12 UTC]
Patches 12 and 13 for GNU MPFR 4.0.1

(CariBlog – MPFR – Software)

Patches 12 and 13 of GNU MPFR 4.0.1 are available in the bugs section of the MPFR 4.0.1 page. They fix bugs in the formatted output functions (mpfr_*printf):

  • Patch 12: Possible undefined behavior in case of error: store to null pointer, free of bad pointer, and <stdarg.h> related undefined behavior.

  • Patch 13: The flags for the P length modifier (mpfr_prec_t argument) are ignored; this includes the sign of the field width when the value is provided in argument (by using an asterisk * in the format string).



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