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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [roundq.c] - Blame information for rev 740

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1 740 jeremybenn
/* Round long double to integer away from zero.
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   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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                  Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, write to the Free
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   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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   02111-1307 USA.  */
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#include "quadmath-imp.h"
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static const __float128 huge = 1.0E4930Q;
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__float128
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roundq (__float128 x)
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{
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  int32_t j0;
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  uint64_t i1, i0;
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  GET_FLT128_WORDS64 (i0, i1, x);
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  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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  if (j0 < 31)
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    {
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      if (j0 < 0)
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        {
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          if (huge + x > 0.0)
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            {
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              i0 &= 0x8000000000000000ULL;
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              if (j0 == -1)
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                i0 |= 0x3fff000000000000LL;
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              i1 = 0;
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            }
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        }
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      else
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        {
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          uint64_t i = 0x0000ffffffffffffLL >> j0;
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          if (((i0 & i) | i1) == 0)
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            /* X is integral.  */
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            return x;
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          if (huge + x > 0.0)
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            {
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              /* Raise inexact if x != 0.  */
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              i0 += 0x0000800000000000LL >> j0;
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              i0 &= ~i;
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              i1 = 0;
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            }
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        }
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    }
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  else if (j0 > 111)
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    {
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      if (j0 == 0x4000)
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        /* Inf or NaN.  */
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        return x + x;
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      else
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        return x;
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    }
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  else
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    {
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      uint64_t i = -1ULL >> (j0 - 48);
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      if ((i1 & i) == 0)
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        /* X is integral.  */
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        return x;
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      if (huge + x > 0.0)
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        {
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          /* Raise inexact if x != 0.  */
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          uint64_t j = i1 + (1LL << (111 - j0));
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          if (j < i1)
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            i0 += 1;
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          i1 = j;
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        }
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      i1 &= ~i;
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    }
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  SET_FLT128_WORDS64 (x, i0, i1);
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  return x;
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}

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