1/* Round argument to nearest integral value according to current rounding
2   direction.
3   Copyright (C) 1997, 2006 Free Software Foundation, Inc.
4   This file is part of the GNU C Library.
5   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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 <math.h>
23
24#include "math_private.h"
25
26static const float two23[2] =
27{
28  8.3886080000e+06, /* 0x4B000000 */
29 -8.3886080000e+06, /* 0xCB000000 */
30};
31
32
33long long int
34__llrintf (float x)
35{
36  int32_t j0;
37  u_int32_t i0;
38  volatile float w;
39  float t;
40  long long int result;
41  int sx;
42
43  GET_FLOAT_WORD (i0, x);
44
45  sx = i0 >> 31;
46  j0 = ((i0 >> 23) & 0xff) - 0x7f;
47  i0 &= 0x7fffff;
48  i0 |= 0x800000;
49
50  if (j0 < (int32_t) (sizeof (long long int) * 8) - 1)
51    {
52      if (j0 >= 23)
53	result = (long long int) i0 << (j0 - 23);
54      else
55	{
56	  w = two23[sx] + x;
57	  t = w - two23[sx];
58	  GET_FLOAT_WORD (i0, t);
59	  j0 = ((i0 >> 23) & 0xff) - 0x7f;
60	  i0 &= 0x7fffff;
61	  i0 |= 0x800000;
62
63	  result = (j0 < 0 ? 0 : i0 >> (23 - j0));
64	}
65    }
66  else
67    {
68      /* The number is too large.  It is left implementation defined
69	 what happens.  */
70      return (long long int) x;
71    }
72
73  return sx ? -result : result;
74}
75
76weak_alias (__llrintf, llrintf)
77