summaryrefslogtreecommitdiff
path: root/Build/source/libs/mpfr/mpfr-3.1.2/src/div_2si.c
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-3.1.2/src/div_2si.c')
-rw-r--r--Build/source/libs/mpfr/mpfr-3.1.2/src/div_2si.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-3.1.2/src/div_2si.c b/Build/source/libs/mpfr/mpfr-3.1.2/src/div_2si.c
new file mode 100644
index 00000000000..5de15b9f632
--- /dev/null
+++ b/Build/source/libs/mpfr/mpfr-3.1.2/src/div_2si.c
@@ -0,0 +1,60 @@
+/* mpfr_div_2si -- divide a floating-point number by a power of two
+
+Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+Contributed by the AriC 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_div_2si (mpfr_ptr y, mpfr_srcptr x, long int n, mpfr_rnd_t rnd_mode)
+{
+ int inexact;
+
+ MPFR_LOG_FUNC
+ (("x[%Pu]=%.*Rg n=%ld rnd=%d",
+ mpfr_get_prec(x), mpfr_log_prec, x, n, rnd_mode),
+ ("y[%Pu]=%.*Rg inexact=%d",
+ mpfr_get_prec(y), mpfr_log_prec, y, inexact));
+
+ if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
+ return mpfr_set (y, x, rnd_mode);
+ else
+ {
+ mpfr_exp_t exp = MPFR_GET_EXP (x);
+ MPFR_SETRAW (inexact, y, x, exp, rnd_mode);
+ 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));
+ }
+ else if (MPFR_UNLIKELY(n < 0 && (__gmpfr_emax < MPFR_EMIN_MIN - n ||
+ exp > __gmpfr_emax + n)) )
+ return mpfr_overflow (y, rnd_mode, MPFR_SIGN(y));
+
+ MPFR_SET_EXP (y, exp - n);
+ }
+
+ MPFR_RET (inexact);
+}