1  /* Round long double to integer away from zero.
       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  roundq (__float128 x)
      27  {
      28    int32_t j0;
      29    uint64_t i1, i0;
      30  
      31    GET_FLT128_WORDS64 (i0, i1, x);
      32    j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
      33    if (j0 < 48)
      34      {
      35        if (j0 < 0)
      36  	{
      37  	  i0 &= 0x8000000000000000ULL;
      38  	  if (j0 == -1)
      39  	    i0 |= 0x3fff000000000000LL;
      40  	  i1 = 0;
      41  	}
      42        else
      43  	{
      44  	  uint64_t i = 0x0000ffffffffffffLL >> j0;
      45  	  if (((i0 & i) | i1) == 0)
      46  	    /* X is integral.  */
      47  	    return x;
      48  
      49  	  i0 += 0x0000800000000000LL >> j0;
      50  	  i0 &= ~i;
      51  	  i1 = 0;
      52  	}
      53      }
      54    else if (j0 > 111)
      55      {
      56        if (j0 == 0x4000)
      57  	/* Inf or NaN.  */
      58  	return x + x;
      59        else
      60  	return x;
      61      }
      62    else
      63      {
      64        uint64_t i = -1ULL >> (j0 - 48);
      65        if ((i1 & i) == 0)
      66  	/* X is integral.  */
      67  	return x;
      68  
      69        uint64_t j = i1 + (1LL << (111 - j0));
      70        if (j < i1)
      71  	i0 += 1;
      72        i1 = j;
      73        i1 &= ~i;
      74      }
      75  
      76    SET_FLT128_WORDS64 (x, i0, i1);
      77    return x;
      78  }