diff options
author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2010-08-17 09:10:13 +0000 |
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committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2010-08-17 09:10:13 +0000 |
commit | c9583bdfe064e1069828e518533f7bc29a8fdddb (patch) | |
tree | 2400842d4095628b8486fbeabaf7bc7b8af4ed02 /src/get_z.c | |
parent | 50ac5b5985174201c7fa6e20496cd2b096107001 (diff) | |
download | mpfr-c9583bdfe064e1069828e518533f7bc29a8fdddb.tar.gz |
Source reorganization. In short:
* Added directories and moved related files into them:
- src for the MPFR source files (to build the library).
- doc for documentation files (except INSTALL, README...).
- tools for various tools (scripts) and mbench.
- tune for tuneup-related source files.
- other for other source files (not distributed in tarballs).
Existing directories:
- tests for the source files of the test suite (make check).
- examples for examples.
- m4 for m4 files.
* Renamed configure.in to configure.ac.
* Added/updated Makefile.am files where needed.
* Updated acinclude.m4 and configure.ac (AC_CONFIG_FILES line).
* Updated the documentation (INSTALL, README, doc/README.dev and
doc/mpfr.texi).
* Updated NEWS and TODO.
* Updated the scripts now in tools.
The following script was used:
#!/usr/bin/env zsh
svn mkdir doc other src tools tune
svn mv ${${(M)$(sed -n '/libmpfr_la_SOURCES/,/[^\]$/p' \
Makefile.am):#*.[ch]}:#get_patches.c} mparam_h.in \
round_raw_generic.c jyn_asympt.c src
svn mv mbench check_inits_clears coverage get_patches.sh mpfrlint \
nightly-test update-patchv update-version tools
svn mv bidimensional_sample.c speed.c tuneup.c tune
svn mv *.{c,h} other
svn mv FAQ.html README.dev algorithm* faq.xsl fdl.texi mpfr.texi \
update-faq doc
svn mv configure.in configure.ac
svn cp Makefile.am src/Makefile.am
svn rm replace_all
[Modifying some files, see above]
svn add doc/Makefile.am
svn add tune/Makefile.am
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@7087 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'src/get_z.c')
-rw-r--r-- | src/get_z.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/get_z.c b/src/get_z.c new file mode 100644 index 000000000..6795955e2 --- /dev/null +++ b/src/get_z.c @@ -0,0 +1,61 @@ +/* mpfr_get_z -- get a multiple-precision integer from + a floating-point number + +Copyright 2004, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. +Contributed by the Arenaire and Caramel projects, INRIA. + +This file is part of the GNU MPFR Library. + +The GNU MPFR Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Lesser General Public License as published by +the Free Software Foundation; either version 3 of the License, or (at your +option) any later version. + +The GNU MPFR Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public +License for more details. + +You should have received a copy of the GNU Lesser General Public License +along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see +http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., +51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include "mpfr-impl.h" + +int +mpfr_get_z (mpz_ptr z, mpfr_srcptr f, mpfr_rnd_t rnd) +{ + int inex; + mpfr_t r; + mpfr_exp_t exp; + + if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (f))) + { + if (MPFR_UNLIKELY (MPFR_NOTZERO (f))) + MPFR_SET_ERANGE (); + mpz_set_ui (z, 0); + /* The ternary value is 0 even for infinity. Giving the rounding + direction in this case would not make much sense anyway, and + the direction would not necessarily match rnd. */ + return 0; + } + + exp = MPFR_GET_EXP (f); + /* if exp <= 0, then |f|<1, thus |o(f)|<=1 */ + MPFR_ASSERTN (exp < 0 || exp <= MPFR_PREC_MAX); + mpfr_init2 (r, (exp < (mpfr_exp_t) MPFR_PREC_MIN ? + MPFR_PREC_MIN : (mpfr_prec_t) exp)); + inex = mpfr_rint (r, f, rnd); + MPFR_ASSERTN (inex != 1 && inex != -1); /* integral part of f is + representable in r */ + MPFR_ASSERTN (MPFR_IS_FP (r)); + exp = mpfr_get_z_2exp (z, r); + if (exp >= 0) + mpz_mul_2exp (z, z, exp); + else + mpz_fdiv_q_2exp (z, z, -exp); + mpfr_clear (r); + + return inex; +} |