sysdeps/m68k/m680x0/fpu/s_csin_template.c

   1 /* Complex sine function.  m68k fpu version
   2    Copyright (C) 1997-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <complex.h>
  21 #include <math.h>
  22 #include "mathimpl.h"
  23
  24 #define s(name) M_SUF (name)
  25 #define m81(func) __m81_u(s(func))
  26
  27 CFLOAT
  28 s(__csin) (CFLOAT x)
  29 {
  30   CFLOAT retval;
  31   unsigned long rx_cond = __m81_test (__real__ x);
  32
  33   if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
  34     {
  35       /* Real part is finite.  */
  36       FLOAT sin_rx, cos_rx;
  37
  38       __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
  39              : "f" (__real__ x));
  40       if (rx_cond & __M81_COND_ZERO)
  41         __real__ retval = __real__ x;
  42       else
  43         __real__ retval = sin_rx * m81(__ieee754_cosh) (__imag__ x);
  44       __imag__ retval = cos_rx * m81(__ieee754_sinh) (__imag__ x);
  45     }
  46   else
  47     {
  48       unsigned long ix_cond = __m81_test (__imag__ x);
  49
  50       __real__ retval = __real__ x - __real__ x;
  51       if (ix_cond & (__M81_COND_ZERO|__M81_COND_INF|__M81_COND_NAN))
  52         __imag__ retval = __imag__ x;
  53       else
  54         __imag__ retval = __real__ retval;
  55     }
  56
  57   return retval;
  58 }
  59 declare_mgen_alias (__csin, csin)