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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/sech.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/sech.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/sech.c b/Build/source/libs/mpfr/mpfr-src/src/sech.c new file mode 100644 index 00000000000..ff8999605f3 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/sech.c @@ -0,0 +1,40 @@ +/* mpfr_sech - Hyperbolic secant function = 1/cosh. + +Copyright 2005-2015 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. */ + +/* The hyperbolic secant function is defined by sech(x)=1/cosh(x): + csc (NaN) = NaN. + csc (+Inf) = csc (-Inf) = 0+. + csc (+0) = csc (-0) = 1. + */ + +#define FUNCTION mpfr_sech +#define INVERSE mpfr_cosh +#define ACTION_NAN(y) do { MPFR_SET_NAN(y); MPFR_RET_NAN; } while (1) +#define ACTION_INF(y) return mpfr_set_ui (y, 0, MPFR_RNDN) +#define ACTION_ZERO(y,x) return mpfr_set_ui (y, 1, rnd_mode) +/* for x near 0, sech(x) = 1 - x^2/2 + ..., more precisely |sech(x)-1| <= x^2/2 + for |x| <= 1. The tiny action is the same as for cos(x). */ +#define ACTION_TINY(y,x,r) \ + MPFR_FAST_COMPUTE_IF_SMALL_INPUT(y, __gmpfr_one, -2 * MPFR_GET_EXP (x), 1, \ + 0, r, inexact = _inexact; goto end) + +#include "gen_inverse.h" |