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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [lrintq.c] - Blame information for rev 848

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Line No. Rev Author Line
1 740 jeremybenn
/* Round argument to nearest integral value according to current rounding
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   direction.
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   Copyright (C) 1997, 1999, 2004, 2006 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 two112[2] =
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{
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  5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
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 -5.19229685853482762853049632922009600E+33Q  /* 0xC06F000000000000, 0 */
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};
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long int
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lrintq (__float128 x)
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{
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  int32_t j0;
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  uint64_t i0,i1;
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  volatile __float128 w;
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  __float128 t;
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  long int result;
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  int sx;
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  GET_FLT128_WORDS64 (i0, i1, x);
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  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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  sx = i0 >> 63;
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  i0 &= 0x0000ffffffffffffLL;
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  i0 |= 0x0001000000000000LL;
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  if (j0 < 48)
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    {
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      w = two112[sx] + x;
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      t = w - two112[sx];
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      GET_FLT128_WORDS64 (i0, i1, t);
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      j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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      i0 &= 0x0000ffffffffffffLL;
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      i0 |= 0x0001000000000000LL;
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      result = (j0 < 0 ? 0 : i0 >> (48 - j0));
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    }
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  else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
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    {
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      if (j0 >= 112)
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        result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
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      else
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        {
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          w = two112[sx] + x;
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          t = w - two112[sx];
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          GET_FLT128_WORDS64 (i0, i1, t);
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          j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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          i0 &= 0x0000ffffffffffffLL;
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          i0 |= 0x0001000000000000LL;
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          if (j0 == 48)
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            result = (long int) i0;
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          else
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            result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
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        }
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    }
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  else
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    {
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      /* The number is too large.  It is left implementation defined
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         what happens.  */
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      return (long int) x;
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    }
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  return sx ? -result : result;
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}

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