1 /* Round argument to nearest integral value according to current rounding
3 Copyright (C) 1997-2018 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.
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.
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.
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/>. */
26 #include <math_private.h>
27 #include <libm-alias-ldouble.h>
28 #include <fix-fp-int-convert-overflow.h>
30 static const _Float128 two112
[2] =
32 L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
33 L(-5.19229685853482762853049632922009600E+33) /* 0xC06F000000000000, 0 */
37 __llrintl (_Float128 x
)
46 GET_LDOUBLE_WORDS64 (i0
, i1
, x
);
47 j0
= ((i0
>> 48) & 0x7fff) - 0x3fff;
49 i0
&= 0x0000ffffffffffffLL
;
50 i0
|= 0x0001000000000000LL
;
52 if (j0
< (int32_t) (8 * sizeof (long long int)) - 1)
54 #if defined FE_INVALID || defined FE_INEXACT
55 /* X < LLONG_MAX + 1 implied by J0 < 63. */
56 if (x
> (_Float128
) LLONG_MAX
)
58 /* In the event of overflow we must raise the "invalid"
59 exception, but not "inexact". */
61 feraiseexcept (t
== LLONG_MAX
? FE_INEXACT
: FE_INVALID
);
69 GET_LDOUBLE_WORDS64 (i0
, i1
, t
);
70 j0
= ((i0
>> 48) & 0x7fff) - 0x3fff;
71 i0
&= 0x0000ffffffffffffLL
;
72 i0
|= 0x0001000000000000LL
;
77 result
= i0
>> (48 - j0
);
79 result
= ((long long int) i0
<< (j0
- 48)) | (i1
>> (112 - j0
));
83 /* The number is too large. Unless it rounds to LLONG_MIN,
84 FE_INVALID must be raised and the return value is
86 #if defined FE_INVALID || defined FE_INEXACT
87 if (x
< (_Float128
) LLONG_MIN
88 && x
> (_Float128
) LLONG_MIN
- 1)
90 /* If truncation produces LLONG_MIN, the cast will not raise
91 the exception, but may raise "inexact". */
93 feraiseexcept (t
== LLONG_MIN
? FE_INEXACT
: FE_INVALID
);
96 else if (FIX_LDBL_LLONG_CONVERT_OVERFLOW
&& x
!= (_Float128
) LLONG_MIN
)
98 feraiseexcept (FE_INVALID
);
99 return sx
== 0 ? LLONG_MAX
: LLONG_MIN
;
103 return (long long int) x
;
106 return sx
? -result
: result
;
109 libm_alias_ldouble (__llrint
, llrint
)