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04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/* Return arc sine of a complex float type.
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Copyright (C) 1997-2019 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 <math.h>
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CFLOAT
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M_DECL_FUNC (__casin) (CFLOAT x)
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{
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CFLOAT res;
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if (isnan (__real__ x) || isnan (__imag__ x))
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{
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if (__real__ x == 0)
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{
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res = x;
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}
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else if (isinf (__real__ x) || isinf (__imag__ x))
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{
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__real__ res = M_NAN;
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__imag__ res = M_COPYSIGN (M_HUGE_VAL, __imag__ x);
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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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__imag__ res = M_NAN;
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}
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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 (__casinh) (y);
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__real__ res = __imag__ y;
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__imag__ res = -__real__ y;
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}
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return res;
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}
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declare_mgen_alias (__casin, casin)
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