1  /* Complex sine function.  m68k fpu version
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <complex.h>
      20  #include <math.h>
      21  #include "mathimpl.h"
      22  
      23  #define s(name) M_SUF (name)
      24  #define m81(func) __m81_u(s(func))
      25  
      26  CFLOAT
      27  s(__csin) (CFLOAT x)
      28  {
      29    CFLOAT retval;
      30    unsigned long rx_cond = __m81_test (__real__ x);
      31  
      32    if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
      33      {
      34        /* Real part is finite.  */
      35        FLOAT sin_rx, cos_rx;
      36  
      37        __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
      38  	     : "f" (__real__ x));
      39        if (rx_cond & __M81_COND_ZERO)
      40  	__real__ retval = __real__ x;
      41        else
      42  	__real__ retval = sin_rx * m81(__ieee754_cosh) (__imag__ x);
      43        __imag__ retval = cos_rx * m81(__ieee754_sinh) (__imag__ x);
      44      }
      45    else
      46      {
      47        unsigned long ix_cond = __m81_test (__imag__ x);
      48  
      49        __real__ retval = __real__ x - __real__ x;
      50        if (ix_cond & (__M81_COND_ZERO|__M81_COND_INF|__M81_COND_NAN))
      51  	__imag__ retval = __imag__ x;
      52        else
      53  	__imag__ retval = __real__ retval;
      54      }
      55  
      56    return retval;
      57  }
      58  declare_mgen_alias (__csin, csin)