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/mul_2si.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/mul_2si.c')
-rw-r--r-- | src/mul_2si.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/mul_2si.c b/src/mul_2si.c new file mode 100644 index 000000000..392348d0e --- /dev/null +++ b/src/mul_2si.c @@ -0,0 +1,56 @@ +/* mpfr_mul_2si -- multiply a floating-point number by a power of two + +Copyright 1999, 2001, 2002, 2003, 2004, 2005, 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_mul_2si (mpfr_ptr y, mpfr_srcptr x, long int n, mpfr_rnd_t rnd_mode) +{ + int inexact; + + MPFR_LOG_FUNC (("x[%#R]=%R n=%ld rnd=%d", x, x, n, rnd_mode), + ("y[%#R]=%R inexact=%d", y, y, inexact)); + + inexact = MPFR_UNLIKELY(y != x) ? mpfr_set (y, x, rnd_mode) : 0; + + if (MPFR_LIKELY( MPFR_IS_PURE_FP(y)) ) + { + mpfr_exp_t exp = MPFR_GET_EXP (y); + if (MPFR_UNLIKELY( n > 0 && (__gmpfr_emax < MPFR_EMIN_MIN + n || + exp > __gmpfr_emax - n))) + return mpfr_overflow (y, rnd_mode, MPFR_SIGN(y)); + + else if (MPFR_UNLIKELY(n < 0 && (__gmpfr_emin > MPFR_EMAX_MAX + n || + exp < __gmpfr_emin - n))) + { + if (rnd_mode == MPFR_RNDN && + (__gmpfr_emin > MPFR_EMAX_MAX + (n + 1) || + exp < __gmpfr_emin - (n + 1) || + (inexact >= 0 && mpfr_powerof2_raw (y)))) + rnd_mode = MPFR_RNDZ; + return mpfr_underflow (y, rnd_mode, MPFR_SIGN(y)); + } + MPFR_SET_EXP (y, exp + n); + } + + return inexact; +} |