aboutsummaryrefslogtreecommitdiff
path: root/math/s_ctanh.c
diff options
context:
space:
mode:
Diffstat (limited to 'math/s_ctanh.c')
-rw-r--r--math/s_ctanh.c129
1 files changed, 0 insertions, 129 deletions
diff --git a/math/s_ctanh.c b/math/s_ctanh.c
deleted file mode 100644
index 2d18875..0000000
--- a/math/s_ctanh.c
+++ /dev/null
@@ -1,129 +0,0 @@
-/* Complex hyperbole tangent for double.
- Copyright (C) 1997-2016 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
- The GNU C 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 2.1 of the License, or (at your option) any later version.
-
- The GNU C 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 C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <complex.h>
-#include <fenv.h>
-#include <math.h>
-#include <math_private.h>
-#include <float.h>
-
-__complex__ double
-__ctanh (__complex__ double x)
-{
- __complex__ double res;
-
- if (__glibc_unlikely (!isfinite (__real__ x) || !isfinite (__imag__ x)))
- {
- if (isinf (__real__ x))
- {
- __real__ res = __copysign (1.0, __real__ x);
- if (isfinite (__imag__ x) && fabs (__imag__ x) > 1.0)
- {
- double sinix, cosix;
- __sincos (__imag__ x, &sinix, &cosix);
- __imag__ res = __copysign (0.0, sinix * cosix);
- }
- else
- __imag__ res = __copysign (0.0, __imag__ x);
- }
- else if (__imag__ x == 0.0)
- {
- res = x;
- }
- else
- {
- __real__ res = __nan ("");
- __imag__ res = __nan ("");
-
- if (isinf (__imag__ x))
- feraiseexcept (FE_INVALID);
- }
- }
- else
- {
- double sinix, cosix;
- double den;
- const int t = (int) ((DBL_MAX_EXP - 1) * M_LN2 / 2);
-
- /* tanh(x+iy) = (sinh(2x) + i*sin(2y))/(cosh(2x) + cos(2y))
- = (sinh(x)*cosh(x) + i*sin(y)*cos(y))/(sinh(x)^2 + cos(y)^2). */
-
- if (__glibc_likely (fabs (__imag__ x) > DBL_MIN))
- {
- __sincos (__imag__ x, &sinix, &cosix);
- }
- else
- {
- sinix = __imag__ x;
- cosix = 1.0;
- }
-
- if (fabs (__real__ x) > t)
- {
- /* Avoid intermediate overflow when the imaginary part of
- the result may be subnormal. Ignoring negligible terms,
- the real part is +/- 1, the imaginary part is
- sin(y)*cos(y)/sinh(x)^2 = 4*sin(y)*cos(y)/exp(2x). */
- double exp_2t = __ieee754_exp (2 * t);
-
- __real__ res = __copysign (1.0, __real__ x);
- __imag__ res = 4 * sinix * cosix;
- __real__ x = fabs (__real__ x);
- __real__ x -= t;
- __imag__ res /= exp_2t;
- if (__real__ x > t)
- {
- /* Underflow (original real part of x has absolute value
- > 2t). */
- __imag__ res /= exp_2t;
- }
- else
- __imag__ res /= __ieee754_exp (2 * __real__ x);
- }
- else
- {
- double sinhrx, coshrx;
- if (fabs (__real__ x) > DBL_MIN)
- {
- sinhrx = __ieee754_sinh (__real__ x);
- coshrx = __ieee754_cosh (__real__ x);
- }
- else
- {
- sinhrx = __real__ x;
- coshrx = 1.0;
- }
-
- if (fabs (sinhrx) > fabs (cosix) * DBL_EPSILON)
- den = sinhrx * sinhrx + cosix * cosix;
- else
- den = cosix * cosix;
- __real__ res = sinhrx * coshrx / den;
- __imag__ res = sinix * cosix / den;
- }
- math_check_force_underflow_complex (res);
- }
-
- return res;
-}
-weak_alias (__ctanh, ctanh)
-#ifdef NO_LONG_DOUBLE
-strong_alias (__ctanh, __ctanhl)
-weak_alias (__ctanh, ctanhl)
-#endif