1 /* Truncate argument to nearest integral value not larger than the argument.
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/>. */
19 #define NO_MATH_REDIRECT
22 #include <math_private.h>
23 #include <libm-alias-ldouble.h>
24 #include <math-use-builtins.h>
28 __truncl (_Float128 x
)
30 #if USE_TRUNCL_BUILTIN
31 return __builtin_truncl (x
);
33 /* Use generic implementation. */
37 GET_LDOUBLE_WORDS64 (i0
, i1
, x
);
38 sx
= i0
& 0x8000000000000000ULL
;
39 j0
= ((i0
>> 48) & 0x7fff) - 0x3fff;
43 /* The magnitude of the number is < 1 so the result is +-0. */
44 SET_LDOUBLE_WORDS64 (x
, sx
, 0);
46 SET_LDOUBLE_WORDS64 (x
, i0
& ~(0x0000ffffffffffffLL
>> j0
), 0);
51 /* x is inf or NaN. */
56 SET_LDOUBLE_WORDS64 (x
, i0
, i1
& ~(0xffffffffffffffffULL
>> (j0
- 48)));
60 #endif /* ! USE_TRUNCL_BUILTIN */
62 libm_alias_ldouble (__trunc
, trunc
)