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Diffstat (limited to 'math/s_ctan.c')
| -rw-r--r-- | math/s_ctan.c | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/math/s_ctan.c b/math/s_ctan.c deleted file mode 100644 index 8e8bf2ee2b..0000000000 --- a/math/s_ctan.c +++ /dev/null @@ -1,129 +0,0 @@ -/* Complex tangent function 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 -__ctan (__complex__ double x) -{ - __complex__ double res; - - if (__glibc_unlikely (!isfinite (__real__ x) || !isfinite (__imag__ x))) - { - if (isinf (__imag__ x)) - { - if (isfinite (__real__ x) && fabs (__real__ x) > 1.0) - { - double sinrx, cosrx; - __sincos (__real__ x, &sinrx, &cosrx); - __real__ res = __copysign (0.0, sinrx * cosrx); - } - else - __real__ res = __copysign (0.0, __real__ x); - __imag__ res = __copysign (1.0, __imag__ x); - } - else if (__real__ x == 0.0) - { - res = x; - } - else - { - __real__ res = __nan (""); - __imag__ res = __nan (""); - - if (isinf (__real__ x)) - feraiseexcept (FE_INVALID); - } - } - else - { - double sinrx, cosrx; - double den; - const int t = (int) ((DBL_MAX_EXP - 1) * M_LN2 / 2); - - /* tan(x+iy) = (sin(2x) + i*sinh(2y))/(cos(2x) + cosh(2y)) - = (sin(x)*cos(x) + i*sinh(y)*cosh(y)/(cos(x)^2 + sinh(y)^2). */ - - if (__glibc_likely (fabs (__real__ x) > DBL_MIN)) - { - __sincos (__real__ x, &sinrx, &cosrx); - } - else - { - sinrx = __real__ x; - cosrx = 1.0; - } - - if (fabs (__imag__ x) > t) - { - /* Avoid intermediate overflow when the real part of the - result may be subnormal. Ignoring negligible terms, the - imaginary part is +/- 1, the real part is - sin(x)*cos(x)/sinh(y)^2 = 4*sin(x)*cos(x)/exp(2y). */ - double exp_2t = __ieee754_exp (2 * t); - - __imag__ res = __copysign (1.0, __imag__ x); - __real__ res = 4 * sinrx * cosrx; - __imag__ x = fabs (__imag__ x); - __imag__ x -= t; - __real__ res /= exp_2t; - if (__imag__ x > t) - { - /* Underflow (original imaginary part of x has absolute - value > 2t). */ - __real__ res /= exp_2t; - } - else - __real__ res /= __ieee754_exp (2 * __imag__ x); - } - else - { - double sinhix, coshix; - if (fabs (__imag__ x) > DBL_MIN) - { - sinhix = __ieee754_sinh (__imag__ x); - coshix = __ieee754_cosh (__imag__ x); - } - else - { - sinhix = __imag__ x; - coshix = 1.0; - } - - if (fabs (sinhix) > fabs (cosrx) * DBL_EPSILON) - den = cosrx * cosrx + sinhix * sinhix; - else - den = cosrx * cosrx; - __real__ res = sinrx * cosrx / den; - __imag__ res = sinhix * coshix / den; - } - math_check_force_underflow_complex (res); - } - - return res; -} -weak_alias (__ctan, ctan) -#ifdef NO_LONG_DOUBLE -strong_alias (__ctan, __ctanl) -weak_alias (__ctan, ctanl) -#endif |