sysdeps/m68k/fpu/s_ccos.c

   1 /* Complex cosine function.  m68k fpu version
   2    Copyright (C) 1997, 1999 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <complex.h>
  22 #include <math.h>
  23 #include "mathimpl.h"
  24
  25 #ifndef SUFF
  26 #define SUFF
  27 #endif
  28 #ifndef float_type
  29 #define float_type double
  30 #endif
  31
  32 #define CONCATX(a,b) __CONCAT(a,b)
  33 #define s(name) CONCATX(name,SUFF)
  34 #define m81(func) __m81_u(s(func))
  35
  36 __complex__ float_type
  37 s(__ccos) (__complex__ float_type x)
  38 {
  39   __complex__ float_type retval;
  40   unsigned long rx_cond = __m81_test (__real__ x);
  41
  42   if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
  43     {
  44       /* Real part is finite.  */
  45       float_type sin_rx, cos_rx;
  46
  47       __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
  48              : "f" (__real__ x));
  49       __real__ retval = cos_rx * m81(__ieee754_cosh) (__imag__ x);
  50       if (rx_cond & __M81_COND_ZERO)
  51         __imag__ retval = (m81(__signbit) (__imag__ x)
  52                            ? __real__ x : -__real__ x);
  53       else
  54         __imag__ retval = -sin_rx * m81(__ieee754_sinh) (__imag__ x);
  55     }
  56   else
  57     {
  58       unsigned long ix_cond = __m81_test (__imag__ x);
  59
  60       if (ix_cond & __M81_COND_INF)
  61         __real__ retval = s(fabs) (__imag__ x);
  62       else
  63         __real__ retval = __real__ x - __real__ x;
  64       if (ix_cond & __M81_COND_ZERO)
  65         __imag__ retval = __imag__ x;
  66       else
  67         __imag__ retval = __real__ x - __real__ x;
  68     }
  69
  70   return retval;
  71 }
  72 #define weak_aliasx(a,b) weak_alias(a,b)
  73 weak_aliasx (s(__ccos), s(ccos))