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132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/* Complex sine function for double.
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Copyright (C) 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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_private.h"
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__complex__ double
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__csin (__complex__ double x)
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{
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__complex__ double retval;
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int negate = signbit (__real__ x);
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int rcls = fpclassify (__real__ x);
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int icls = fpclassify (__imag__ x);
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__real__ x = fabs (__real__ x);
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if (icls >= FP_ZERO)
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{
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/* Imaginary part is finite. */
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if (rcls >= FP_ZERO)
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{
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/* Real part is finite. */
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double sinh_val = __ieee754_sinh (__imag__ x);
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double cosh_val = __ieee754_cosh (__imag__ x);
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double sinix, cosix;
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__sincos (__real__ x, &sinix, &cosix);
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__real__ retval = cosh_val * sinix;
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__imag__ retval = sinh_val * cosix;
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if (negate)
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__real__ retval = -__real__ retval;
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}
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else
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{
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if (icls == FP_ZERO)
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{
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/* Imaginary part is 0.0. */
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__real__ retval = __nan ("");
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__imag__ retval = __imag__ x;
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#ifdef FE_INVALID
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if (rcls == FP_INFINITE)
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feraiseexcept (FE_INVALID);
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#endif
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}
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else
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{
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__real__ retval = __nan ("");
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__imag__ retval = __nan ("");
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#ifdef FE_INVALID
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feraiseexcept (FE_INVALID);
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#endif
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}
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}
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}
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else if (icls == FP_INFINITE)
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{
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/* Imaginary part is infinite. */
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if (rcls == FP_ZERO)
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{
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/* Real part is 0.0. */
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__real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
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__imag__ retval = __imag__ x;
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}
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else if (rcls > FP_ZERO)
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{
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/* Real part is finite. */
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double sinix, cosix;
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__sincos (__real__ x, &sinix, &cosix);
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__real__ retval = __copysign (HUGE_VAL, sinix);
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__imag__ retval = __copysign (HUGE_VAL, cosix);
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if (negate)
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__real__ retval = -__real__ retval;
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if (signbit (__imag__ x))
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__imag__ retval = -__imag__ retval;
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}
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else
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{
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/* The addition raises the invalid exception. */
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__real__ retval = __nan ("");
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__imag__ retval = HUGE_VAL;
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#ifdef FE_INVALID
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if (rcls == FP_INFINITE)
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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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if (rcls == FP_ZERO)
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__real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
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else
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__real__ retval = __nan ("");
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__imag__ retval = __nan ("");
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}
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return retval;
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}
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weak_alias (__csin, csin)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__csin, __csinl)
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weak_alias (__csin, csinl)
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#endif
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