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Diffstat (limited to 'math/s_ctan_template.c')
-rw-r--r-- | math/s_ctan_template.c | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/math/s_ctan_template.c b/math/s_ctan_template.c deleted file mode 100644 index baf603007f..0000000000 --- a/math/s_ctan_template.c +++ /dev/null @@ -1,130 +0,0 @@ -/* Complex tangent function for a complex float type. - Copyright (C) 1997-2017 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> - -CFLOAT -M_DECL_FUNC (__ctan) (CFLOAT x) -{ - CFLOAT res; - - if (__glibc_unlikely (!isfinite (__real__ x) || !isfinite (__imag__ x))) - { - if (isinf (__imag__ x)) - { - if (isfinite (__real__ x) && M_FABS (__real__ x) > 1) - { - FLOAT sinrx, cosrx; - M_SINCOS (__real__ x, &sinrx, &cosrx); - __real__ res = M_COPYSIGN (0, sinrx * cosrx); - } - else - __real__ res = M_COPYSIGN (0, __real__ x); - __imag__ res = M_COPYSIGN (1, __imag__ x); - } - else if (__real__ x == 0) - { - res = x; - } - else - { - __real__ res = M_NAN; - __imag__ res = M_NAN; - - if (isinf (__real__ x)) - feraiseexcept (FE_INVALID); - } - } - else - { - FLOAT sinrx, cosrx; - FLOAT den; - const int t = (int) ((M_MAX_EXP - 1) * M_MLIT (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 (M_FABS (__real__ x) > M_MIN)) - { - M_SINCOS (__real__ x, &sinrx, &cosrx); - } - else - { - sinrx = __real__ x; - cosrx = 1; - } - - if (M_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). */ - FLOAT exp_2t = M_EXP (2 * t); - - __imag__ res = M_COPYSIGN (1, __imag__ x); - __real__ res = 4 * sinrx * cosrx; - __imag__ x = M_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 /= M_EXP (2 * __imag__ x); - } - else - { - FLOAT sinhix, coshix; - if (M_FABS (__imag__ x) > M_MIN) - { - sinhix = M_SINH (__imag__ x); - coshix = M_COSH (__imag__ x); - } - else - { - sinhix = __imag__ x; - coshix = 1; - } - - if (M_FABS (sinhix) > M_FABS (cosrx) * M_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; -} - -declare_mgen_alias (__ctan, ctan) - -#if M_LIBM_NEED_COMPAT (ctan) -declare_mgen_libm_compat (__ctan, ctan) -#endif |