1  /* Truncate argument to nearest integral value not larger than the argument.
       2     Copyright (C) 1997-2018 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4     Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
       5  		  Jakub Jelinek <jj@ultra.linux.cz>, 1999.
       6  
       7     The GNU C Library is free software; you can redistribute it and/or
       8     modify it under the terms of the GNU Lesser General Public
       9     License as published by the Free Software Foundation; either
      10     version 2.1 of the License, or (at your option) any later version.
      11  
      12     The GNU C Library is distributed in the hope that it will be useful,
      13     but WITHOUT ANY WARRANTY; without even the implied warranty of
      14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15     Lesser General Public License for more details.
      16  
      17     You should have received a copy of the GNU Lesser General Public
      18     License along with the GNU C Library; if not, see
      19     <http://www.gnu.org/licenses/>.  */
      20  
      21  #define NO_MATH_REDIRECT
      22  
      23  #include "quadmath-imp.h"
      24  
      25  __float128
      26  truncq (__float128 x)
      27  {
      28    int32_t j0;
      29    uint64_t i0, i1, sx;
      30  
      31    GET_FLT128_WORDS64 (i0, i1, x);
      32    sx = i0 & 0x8000000000000000ULL;
      33    j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
      34    if (j0 < 48)
      35      {
      36        if (j0 < 0)
      37  	/* The magnitude of the number is < 1 so the result is +-0.  */
      38  	SET_FLT128_WORDS64 (x, sx, 0);
      39        else
      40  	SET_FLT128_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
      41      }
      42    else if (j0 > 111)
      43      {
      44        if (j0 == 0x4000)
      45  	/* x is inf or NaN.  */
      46  	return x + x;
      47      }
      48    else
      49      {
      50        SET_FLT128_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
      51      }
      52  
      53    return x;
      54  }