1 /* Round long double value to long long int.
2 Copyright (C) 1997-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 #include <math_private.h>
24 #include <libm-alias-ldouble.h>
25 #include <fix-fp-int-convert-overflow.h>
28 __llroundl (_Float128 x
)
35 GET_LDOUBLE_WORDS64 (i0
, i1
, x
);
36 j0
= ((i0
>> 48) & 0x7fff) - 0x3fff;
37 sign
= (i0
& 0x8000000000000000ULL
) != 0 ? -1 : 1;
38 i0
&= 0x0000ffffffffffffLL
;
39 i0
|= 0x0001000000000000LL
;
44 return j0
< -1 ? 0 : sign
;
47 i0
+= 0x0000800000000000LL
>> j0
;
48 result
= i0
>> (48 - j0
);
51 else if (j0
< (int32_t) (8 * sizeof (long long int)) - 1)
54 result
= ((long long int) i0
<< (j0
- 48)) | (i1
<< (j0
- 112));
57 uint64_t j
= i1
+ (0x8000000000000000ULL
>> (j0
- 48));
62 result
= (long long int) i0
;
65 result
= ((long long int) i0
<< (j0
- 48)) | (j
>> (112 - j0
));
67 if (sign
== 1 && result
== LLONG_MIN
)
68 /* Rounding brought the value out of range. */
69 feraiseexcept (FE_INVALID
);
76 /* The number is too large. Unless it rounds to LLONG_MIN,
77 FE_INVALID must be raised and the return value is
80 if (FIX_LDBL_LLONG_CONVERT_OVERFLOW
81 && !(sign
== -1 && x
> (_Float128
) LLONG_MIN
- L(0.5)))
83 feraiseexcept (FE_INVALID
);
84 return sign
== 1 ? LLONG_MAX
: LLONG_MIN
;
86 else if (!FIX_LDBL_LLONG_CONVERT_OVERFLOW
87 && x
<= (_Float128
) LLONG_MIN
- L(0.5))
89 /* If truncation produces LLONG_MIN, the cast will not raise
90 the exception, but may raise "inexact". */
91 feraiseexcept (FE_INVALID
);
95 return (long long int) x
;
101 libm_alias_ldouble (__llround
, llround
)