ports/sysdeps/m68k/m680x0/fpu/s_csin.c

   1 /* Complex sine function.  m68k fpu version
   2    Copyright (C) 1997-2012 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <complex.h>
  21 #include <math.h>
  22 #include "mathimpl.h"
  23
  24 #ifndef SUFF
  25 #define SUFF
  26 #endif
  27 #ifndef float_type
  28 #define float_type double
  29 #endif
  30
  31 #define CONCATX(a,b) __CONCAT(a,b)
  32 #define s(name) CONCATX(name,SUFF)
  33 #define m81(func) __m81_u(s(func))
  34
  35 __complex__ float_type
  36 s(__csin) (__complex__ float_type x)
  37 {
  38   __complex__ float_type retval;
  39   unsigned long rx_cond = __m81_test (__real__ x);
  40
  41   if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
  42     {
  43       /* Real part is finite.  */
  44       float_type sin_rx, cos_rx;
  45
  46       __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
  47              : "f" (__real__ x));
  48       if (rx_cond & __M81_COND_ZERO)
  49         __real__ retval = __real__ x;
  50       else
  51         __real__ retval = sin_rx * m81(__ieee754_cosh) (__imag__ x);
  52       __imag__ retval = cos_rx * m81(__ieee754_sinh) (__imag__ x);
  53     }
  54   else
  55     {
  56       unsigned long ix_cond = __m81_test (__imag__ x);
  57
  58       __real__ retval = __real__ x - __real__ x;
  59       if (ix_cond & (__M81_COND_ZERO|__M81_COND_INF|__M81_COND_NAN))
  60         __imag__ retval = __imag__ x;
  61       else
  62         __imag__ retval = __real__ retval;
  63     }
  64
  65   return retval;
  66 }
  67 weak_alias (s(__csin), s(csin))