sysdeps/m68k/fpu/s_cexp.c

   1 /* Complex exponential 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(__cexp) (__complex__ float_type x)
  38 {
  39   __complex__ float_type retval;
  40   unsigned long ix_cond;
  41
  42   ix_cond = __m81_test (__imag__ x);
  43
  44   if ((ix_cond & (__M81_COND_NAN|__M81_COND_INF)) == 0)
  45     {
  46       /* Imaginary part is finite.  */
  47       float_type exp_val = m81(__ieee754_exp) (__real__ x);
  48
  49       __real__ retval = __imag__ retval = exp_val;
  50       if (m81(__finite) (exp_val))
  51         {
  52           float_type sin_ix, cos_ix;
  53           __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_ix), "=f" (cos_ix)
  54                  : "f" (__imag__ x));
  55           __real__ retval *= cos_ix;
  56           if (ix_cond & __M81_COND_ZERO)
  57             __imag__ retval = __imag__ x;
  58           else
  59             __imag__ retval *= sin_ix;
  60         }
  61       else
  62         {
  63           /* Compute the sign of the result.  */
  64           float_type remainder, pi_2;
  65           int quadrant;
  66
  67           __asm ("fmovecr %#0,%0\n\tfscale%.w %#-1,%0" : "=f" (pi_2));
  68           __asm ("fmod%.x %2,%0\n\tfmove%.l %/fpsr,%1"
  69                  : "=f" (remainder), "=dm" (quadrant)
  70                  : "f" (pi_2), "0" (__imag__ x));
  71           quadrant = (quadrant >> 16) & 0x83;
  72           if (quadrant & 0x80)
  73             quadrant ^= 0x83;
  74           switch (quadrant)
  75             {
  76             default:
  77               break;
  78             case 1:
  79               __real__ retval = -__real__ retval;
  80               break;
  81             case 2:
  82               __real__ retval = -__real__ retval;
  83             case 3:
  84               __imag__ retval = -__imag__ retval;
  85               break;
  86             }
  87           if (ix_cond & __M81_COND_ZERO && !m81(__isnan) (exp_val))
  88             __imag__ retval = __imag__ x;
  89         }
  90     }
  91   else
  92     {
  93       unsigned long rx_cond = __m81_test (__real__ x);
  94
  95       if (rx_cond & __M81_COND_INF)
  96         {
  97           /* Real part is infinite.  */
  98           if (rx_cond & __M81_COND_NEG)
  99             {
 100               __real__ retval = __imag__ retval = 0.0;
 101               if (ix_cond & __M81_COND_NEG)
 102                 __imag__ retval = -__imag__ retval;
 103             }
 104           else
 105             {
 106               __real__ retval = __real__ x;
 107               __imag__ retval = __imag__ x - __imag__ x;
 108             }
 109         }
 110       else
 111         __real__ retval = __imag__ retval = __imag__ x - __imag__ x;
 112     }
 113
 114   return retval;
 115 }
 116 #define weak_aliasx(a,b) weak_alias(a,b)
 117 weak_aliasx (s(__cexp), s(cexp))