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authorvlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4>2010-08-17 09:10:13 +0000
committervlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4>2010-08-17 09:10:13 +0000
commitc9583bdfe064e1069828e518533f7bc29a8fdddb (patch)
tree2400842d4095628b8486fbeabaf7bc7b8af4ed02 /src/mul_2ui.c
parent50ac5b5985174201c7fa6e20496cd2b096107001 (diff)
downloadmpfr-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_2ui.c')
-rw-r--r--src/mul_2ui.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/mul_2ui.c b/src/mul_2ui.c
new file mode 100644
index 000000000..dcc5d8a44
--- /dev/null
+++ b/src/mul_2ui.c
@@ -0,0 +1,63 @@
+/* mpfr_mul_2ui -- 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_2ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int n, mpfr_rnd_t rnd_mode)
+{
+ int inexact;
+
+ MPFR_LOG_FUNC (("x[%#R]=%R n=%lu 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)) )
+ {
+ /* n will have to be casted to long to make sure that the addition
+ and subtraction below (for overflow detection) are signed */
+ while (MPFR_UNLIKELY(n > LONG_MAX))
+ {
+ int inex2;
+
+ n -= LONG_MAX;
+ inex2 = mpfr_mul_2ui(y, y, LONG_MAX, rnd_mode);
+ if (inex2)
+ return inex2; /* overflow */
+ }
+
+ /* MPFR_EMIN_MIN + (long) n is signed and doesn't lead to an overflow;
+ the first test useful so that the real test can't lead to an
+ overflow. */
+ {
+ mpfr_exp_t exp = MPFR_GET_EXP (y);
+ if (MPFR_UNLIKELY( __gmpfr_emax < MPFR_EMIN_MIN + (long) n ||
+ exp > __gmpfr_emax - (long) n))
+ return mpfr_overflow (y, rnd_mode, MPFR_SIGN(y));
+
+ MPFR_SET_EXP (y, exp + (long) n);
+ }
+ }
+
+ return inexact;
+}