1  /* Implement modf for m68k.
       2     Copyright (C) 1996-2023 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 <math.h>
      20  #include "mathimpl.h"
      21  
      22  FLOAT
      23  M_DECL_FUNC (__modf) (FLOAT x, FLOAT *iptr)
      24  {
      25    FLOAT x_int, result;
      26    unsigned long x_cond;
      27  
      28    __asm ("fintrz%.x %1, %0" : "=f" (x_int) : "f" (x));
      29    *iptr = x_int;
      30    x_cond = __m81_test (x);
      31    if (x_cond & __M81_COND_INF)
      32      {
      33        result = 0;
      34        if (x_cond & __M81_COND_NEG)
      35  	result = -result;
      36      }
      37    else if (x_cond & __M81_COND_ZERO)
      38      result = x;
      39    else
      40      result = x - x_int;
      41    return result;
      42  }
      43  declare_mgen_alias (__modf, modf)