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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [lrintq.c] - Blame information for rev 801

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/* Round argument to nearest integral value according to current rounding
   direction.
   Copyright (C) 1997, 1999, 2004, 2006 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"
 
static const __float128 two112[2] =
{
  5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
 -5.19229685853482762853049632922009600E+33Q  /* 0xC06F000000000000, 0 */
};
 
long int
lrintq (__float128 x)
{
  int32_t j0;
  uint64_t i0,i1;
  volatile __float128 w;
  __float128 t;
  long int result;
  int sx;
 
  GET_FLT128_WORDS64 (i0, i1, x);
  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
  sx = i0 >> 63;
  i0 &= 0x0000ffffffffffffLL;
  i0 |= 0x0001000000000000LL;
 
  if (j0 < 48)
    {
      w = two112[sx] + x;
      t = w - two112[sx];
      GET_FLT128_WORDS64 (i0, i1, t);
      j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
      i0 &= 0x0000ffffffffffffLL;
      i0 |= 0x0001000000000000LL;
 
      result = (j0 < 0 ? 0 : 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
        {
          w = two112[sx] + x;
          t = w - two112[sx];
          GET_FLT128_WORDS64 (i0, i1, t);
          j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
          i0 &= 0x0000ffffffffffffLL;
          i0 |= 0x0001000000000000LL;
 
          if (j0 == 48)
            result = (long int) i0;
          else
            result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
        }
    }
  else
    {
      /* The number is too large.  It is left implementation defined
         what happens.  */
      return (long int) x;
    }
 
  return sx ? -result : result;
}

Line No.	Rev	Author	Line
1	740	jeremybenn	`/* Round argument to nearest integral value according to current rounding`
2			`direction.`
3			`Copyright (C) 1997, 1999, 2004, 2006 Free Software Foundation, Inc.`
4			`This file is part of the GNU C Library.`
5			`Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and`
6			`Jakub Jelinek <jj@ultra.linux.cz>, 1999.`
7
8			`The GNU C Library is free software; you can redistribute it and/or`
9			`modify it under the terms of the GNU Lesser General Public`
10			`License as published by the Free Software Foundation; either`
11			`version 2.1 of the License, or (at your option) any later version.`
12
13			`The GNU C Library is distributed in the hope that it will be useful,`
14			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
16			`Lesser General Public License for more details.`
17
18			`You should have received a copy of the GNU Lesser General Public`
19			`License along with the GNU C Library; if not, write to the Free`
20			`Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA`
21			`02111-1307 USA. */`
22
23			`#include "quadmath-imp.h"`
24
25			`static const __float128 two112[2] =`
26			`{`
27			`5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */`
28			`-5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */`
29			`};`
30
31			`long int`
32			`lrintq (__float128 x)`
33			`{`
34			`int32_t j0;`
35			`uint64_t i0,i1;`
36			`volatile __float128 w;`
37			`__float128 t;`
38			`long int result;`
39			`int sx;`
40
41			`GET_FLT128_WORDS64 (i0, i1, x);`
42			`j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;`
43			`sx = i0 >> 63;`
44			`i0 &= 0x0000ffffffffffffLL;`
45			`i0 \|= 0x0001000000000000LL;`
46
47			`if (j0 < 48)`
48			`{`
49			`w = two112[sx] + x;`
50			`t = w - two112[sx];`
51			`GET_FLT128_WORDS64 (i0, i1, t);`
52			`j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;`
53			`i0 &= 0x0000ffffffffffffLL;`
54			`i0 \|= 0x0001000000000000LL;`
55
56			`result = (j0 < 0 ? 0 : i0 >> (48 - j0));`
57			`}`
58			`else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)`
59			`{`
60			`if (j0 >= 112)`
61			`result = ((long int) i0 << (j0 - 48)) \| (i1 << (j0 - 112));`
62			`else`
63			`{`
64			`w = two112[sx] + x;`
65			`t = w - two112[sx];`
66			`GET_FLT128_WORDS64 (i0, i1, t);`
67			`j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;`
68			`i0 &= 0x0000ffffffffffffLL;`
69			`i0 \|= 0x0001000000000000LL;`
70
71			`if (j0 == 48)`
72			`result = (long int) i0;`
73			`else`
74			`result = ((long int) i0 << (j0 - 48)) \| (i1 >> (112 - j0));`
75			`}`
76			`}`
77			`else`
78			`{`
79			`/* The number is too large. It is left implementation defined`
80			`what happens. */`
81			`return (long int) x;`
82			`}`
83
84			`return sx ? -result : result;`
85			`}`

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [lrintq.c] - Blame information for rev 801