sysdeps/m68k/m680x0/fpu/s_csin_template.c

   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)