1/* Round argument to nearest integral value according to current rounding
2 direction.
3 Copyright (C) 1997-2017 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, see
20 <http://www.gnu.org/licenses/>. */
21
22#include <fenv.h>
23#include <limits.h>
24#include <math.h>
25
26#include <math_private.h>
27#include <fix-fp-int-convert-overflow.h>
28
29static const _Float128 two112[2] =
30{
31 L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
32 L(-5.19229685853482762853049632922009600E+33) /* 0xC06F000000000000, 0 */
33};
34
35long long int
36__llrintl (_Float128 x)
37{
38 int32_t j0;
39 u_int64_t i0,i1;
40 _Float128 w;
41 _Float128 t;
42 long long int result;
43 int sx;
44
45 GET_LDOUBLE_WORDS64 (i0, i1, x);
46 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
47 sx = i0 >> 63;
48 i0 &= 0x0000ffffffffffffLL;
49 i0 |= 0x0001000000000000LL;
50
51 if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
52 {
53#if defined FE_INVALID || defined FE_INEXACT
54 /* X < LLONG_MAX + 1 implied by J0 < 63. */
55 if (x > (_Float128) LLONG_MAX)
56 {
57 /* In the event of overflow we must raise the "invalid"
58 exception, but not "inexact". */
59 t = __nearbyintl (x);
60 feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID);
61 }
62 else
63#endif
64 {
65 w = two112[sx] + x;
66 t = w - two112[sx];
67 }
68 GET_LDOUBLE_WORDS64 (i0, i1, t);
69 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
70 i0 &= 0x0000ffffffffffffLL;
71 i0 |= 0x0001000000000000LL;
72
73 if (j0 < 0)
74 result = 0;
75 else if (j0 <= 48)
76 result = i0 >> (48 - j0);
77 else
78 result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
79 }
80 else
81 {
82 /* The number is too large. Unless it rounds to LLONG_MIN,
83 FE_INVALID must be raised and the return value is
84 unspecified. */
85#if defined FE_INVALID || defined FE_INEXACT
86 if (x < (_Float128) LLONG_MIN
87 && x > (_Float128) LLONG_MIN - 1)
88 {
89 /* If truncation produces LLONG_MIN, the cast will not raise
90 the exception, but may raise "inexact". */
91 t = __nearbyintl (x);
92 feraiseexcept (t == LLONG_MIN ? FE_INEXACT : FE_INVALID);
93 return LLONG_MIN;
94 }
95 else if (FIX_LDBL_LLONG_CONVERT_OVERFLOW && x != (_Float128) LLONG_MIN)
96 {
97 feraiseexcept (FE_INVALID);
98 return sx == 0 ? LLONG_MAX : LLONG_MIN;
99 }
100
101#endif
102 return (long long int) x;
103 }
104
105 return sx ? -result : result;
106}
107
108weak_alias (__llrintl, llrintl)
109