94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
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/* Return arc hyperbolic cosine for a complex type.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#include <complex.h>
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#include <math.h>
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CFLOAT
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M_DECL_FUNC (__cacosh) (CFLOAT x)
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{
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CFLOAT res;
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int rcls = fpclassify (__real__ x);
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int icls = fpclassify (__imag__ x);
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if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
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{
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if (icls == FP_INFINITE)
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{
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__real__ res = M_HUGE_VAL;
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if (rcls == FP_NAN)
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__imag__ res = M_NAN;
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else
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__imag__ res = M_COPYSIGN ((rcls == FP_INFINITE
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? (__real__ x < 0
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? M_MLIT (M_PI) - M_MLIT (M_PI_4)
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: M_MLIT (M_PI_4))
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: M_MLIT (M_PI_2)), __imag__ x);
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}
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else if (rcls == FP_INFINITE)
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{
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__real__ res = M_HUGE_VAL;
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if (icls >= FP_ZERO)
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__imag__ res = M_COPYSIGN (signbit (__real__ x)
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? M_MLIT (M_PI) : 0, __imag__ x);
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else
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__imag__ res = M_NAN;
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}
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else
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{
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__real__ res = M_NAN;
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if (rcls == FP_ZERO)
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__imag__ res = M_MLIT (M_PI_2);
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else
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__imag__ res = M_NAN;
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}
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}
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else if (rcls == FP_ZERO && icls == FP_ZERO)
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{
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__real__ res = 0;
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__imag__ res = M_COPYSIGN (M_MLIT (M_PI_2), __imag__ x);
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}
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else
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{
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CFLOAT y;
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__real__ y = -__imag__ x;
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__imag__ y = __real__ x;
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y = M_SUF (__kernel_casinh) (y, 1);
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if (signbit (__imag__ x))
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{
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__real__ res = __real__ y;
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__imag__ res = -__imag__ y;
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}
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else
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{
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__real__ res = -__real__ y;
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__imag__ res = __imag__ y;
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}
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}
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return res;
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}
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declare_mgen_alias (__cacosh, cacosh)
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