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88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* Complex tangent function for long double. IBM extended format version.
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Copyright (C) 1997,2005,2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <complex.h>
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#include <fenv.h>
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#include <math.h>
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#include <math_ldbl_opt.h>
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#include <math_private.h>
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__complex__ long double
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__ctanl (__complex__ long double x)
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{
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__complex__ long double res;
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if (!isfinite (__real__ x) || !isfinite (__imag__ x))
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{
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if (__isinfl (__imag__ x))
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{
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__real__ res = __copysignl (0.0, __real__ x);
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__imag__ res = __copysignl (1.0, __imag__ x);
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}
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else if (__real__ x == 0.0)
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{
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res = x;
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}
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else
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{
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__real__ res = __nanl ("");
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__imag__ res = __nanl ("");
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#ifdef FE_INVALID
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if (__isinfl (__real__ x))
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feraiseexcept (FE_INVALID);
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#endif
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}
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}
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else
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{
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long double sin2rx, cos2rx;
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long double den;
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__sincosl (2.0 * __real__ x, &sin2rx, &cos2rx);
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den = cos2rx + __ieee754_coshl (2.0 * __imag__ x);
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if (den == 0.0)
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{
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__complex__ long double ez = __cexpl (1.0i * x);
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__complex__ long double emz = __cexpl (-1.0i * x);
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res = (ez - emz) / (ez + emz) * -1.0i;
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}
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else
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{
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__real__ res = sin2rx / den;
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__imag__ res = __ieee754_sinhl (2.0 * __imag__ x) / den;
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}
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/* __gcc_qmul does not respect -0.0 so we need the following fixup. */
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if ((__real__ res == 0.0) && (__real__ x == 0.0))
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__real__ res = __real__ x;
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if ((__real__ res == 0.0) && (__imag__ x == 0.0))
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__imag__ res = __imag__ x;
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}
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return res;
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}
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long_double_symbol (libm, __ctanl, ctanl);
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