1/* Round float value to long long int.
2 Copyright (C) 1997-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <fenv.h>
21#include <limits.h>
22#include <math.h>
23
24#include <math_private.h>
25#include <libm-alias-float.h>
26#include <fix-fp-int-convert-overflow.h>
27
28
29long long int
30__llroundf (float x)
31{
32 int32_t j0;
33 uint32_t i;
34 long long int result;
35 int sign;
36
37 GET_FLOAT_WORD (i, x);
38 j0 = ((i >> 23) & 0xff) - 0x7f;
39 sign = (i & 0x80000000) != 0 ? -1 : 1;
40 i &= 0x7fffff;
41 i |= 0x800000;
42
43 if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
44 {
45 if (j0 < 0)
46 return j0 < -1 ? 0 : sign;
47 else if (j0 >= 23)
48 result = (long long int) i << (j0 - 23);
49 else
50 {
51 i += 0x400000 >> j0;
52
53 result = i >> (23 - j0);
54 }
55 }
56 else
57 {
58#ifdef FE_INVALID
59 /* The number is too large. Unless it rounds to LLONG_MIN,
60 FE_INVALID must be raised and the return value is
61 unspecified. */
62 if (FIX_FLT_LLONG_CONVERT_OVERFLOW && x != (float) LLONG_MIN)
63 {
64 feraiseexcept (FE_INVALID);
65 return sign == 1 ? LLONG_MAX : LLONG_MIN;
66 }
67#endif
68 return (long long int) x;
69 }
70
71 return sign * result;
72}
73
74libm_alias_float (__llround, llround)
75