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

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/* Round long double value to long int.
   Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
                  Jakub Jelinek <jj@ultra.linux.cz>, 1999.
 
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */
 
#include "quadmath-imp.h"
 
 
long int
lroundq (__float128 x)
{
  int64_t j0;
  uint64_t i1, i0;
  long int result;
  int sign;
 
  GET_FLT128_WORDS64 (i0, i1, x);
  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
  sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;
  i0 &= 0x0000ffffffffffffLL;
  i0 |= 0x0001000000000000LL;
 
  if (j0 < 48)
    {
      if (j0 < 0)
        return j0 < -1 ? 0 : sign;
      else
        {
          i0 += 0x0000800000000000LL >> j0;
          result = i0 >> (48 - j0);
        }
    }
  else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
    {
      if (j0 >= 112)
        result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
      else
        {
          uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
          if (j < i1)
            ++i0;
 
          if (j0 == 48)
            result = (long int) i0;
          else
            result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0));
        }
    }
  else
    {
      /* The number is too large.  It is left implementation defined
         what happens.  */
      return (long int) x;
    }
 
  return sign * result;
}

Line No.	Rev	Author	Line
1	740	jeremybenn	`/* Round long double value to long int.`
2			`Copyright (C) 1997, 1999, 2004 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, write to the Free`
19			`Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA`
20			`02111-1307 USA. */`
21
22			`#include "quadmath-imp.h"`
23
24
25			`long int`
26			`lroundq (__float128 x)`
27			`{`
28			`int64_t j0;`
29			`uint64_t i1, i0;`
30			`long int result;`
31			`int sign;`
32
33			`GET_FLT128_WORDS64 (i0, i1, x);`
34			`j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;`
35			`sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;`
36			`i0 &= 0x0000ffffffffffffLL;`
37			`i0 \|= 0x0001000000000000LL;`
38
39			`if (j0 < 48)`
40			`{`
41			`if (j0 < 0)`
42			`return j0 < -1 ? 0 : sign;`
43			`else`
44			`{`
45			`i0 += 0x0000800000000000LL >> j0;`
46			`result = i0 >> (48 - j0);`
47			`}`
48			`}`
49			`else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)`
50			`{`
51			`if (j0 >= 112)`
52			`result = ((long int) i0 << (j0 - 48)) \| (i1 << (j0 - 112));`
53			`else`
54			`{`
55			`uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));`
56			`if (j < i1)`
57			`++i0;`
58
59			`if (j0 == 48)`
60			`result = (long int) i0;`
61			`else`
62			`result = ((long int) i0 << (j0 - 48)) \| (j >> (112 - j0));`
63			`}`
64			`}`
65			`else`
66			`{`
67			`/* The number is too large. It is left implementation defined`
68			`what happens. */`
69			`return (long int) x;`
70			`}`
71
72			`return sign * result;`
73			`}`

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