projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| bc9f6000 | 1 | /* Truncate argument to nearest integral value not larger than the argument. |
| dff8da6b | 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
| bc9f6000 | 3 | This file is part of the GNU C Library. |
| bc9f6000 UD |
4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
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. | |
| bc9f6000 UD |
9 | |
| 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 | |
| 41bdb6e2 | 13 | Lesser General Public License for more details. |
| bc9f6000 | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| bc9f6000 | 18 | |
| 7abf97be | 19 | #define NO_MATH_REDIRECT |
| bc9f6000 UD |
20 | #include <math.h> |
| 21 | ||
| 1ed0291c | 22 | #include <math_private.h> |
| fd3b4e7c | 23 | #include <libm-alias-ldouble.h> |
| 1ac9c1cf | 24 | #include <math-use-builtins.h> |
| bc9f6000 UD |
25 | |
| 26 | ||
| 15089e04 PM |
27 | _Float128 |
| 28 | __truncl (_Float128 x) | |
| bc9f6000 | 29 | { |
| 1ac9c1cf SL |
30 | #if USE_TRUNCL_BUILTIN |
| 31 | return __builtin_truncl (x); | |
| 32 | #else | |
| 33 | /* Use generic implementation. */ | |
| abfbdde1 | 34 | int32_t j0; |
| 24ab7723 | 35 | uint64_t i0, i1, sx; |
| abfbdde1 UD |
36 | |
| 37 | GET_LDOUBLE_WORDS64 (i0, i1, x); | |
| 38 | sx = i0 & 0x8000000000000000ULL; | |
| 39 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
| 40 | if (j0 < 48) | |
| bc9f6000 UD |
41 | { |
| 42 | if (j0 < 0) | |
| 43 | /* The magnitude of the number is < 1 so the result is +-0. */ | |
| abfbdde1 | 44 | SET_LDOUBLE_WORDS64 (x, sx, 0); |
| bc9f6000 | 45 | else |
| abfbdde1 | 46 | SET_LDOUBLE_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0); |
| bc9f6000 | 47 | } |
| abfbdde1 | 48 | else if (j0 > 111) |
| bc9f6000 UD |
49 | { |
| 50 | if (j0 == 0x4000) | |
| 51 | /* x is inf or NaN. */ | |
| 52 | return x + x; | |
| 53 | } | |
| 54 | else | |
| 55 | { | |
| abfbdde1 | 56 | SET_LDOUBLE_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48))); |
| bc9f6000 UD |
57 | } |
| 58 | ||
| 59 | return x; | |
| 1ac9c1cf | 60 | #endif /* ! USE_TRUNCL_BUILTIN */ |
| bc9f6000 | 61 | } |
| fd3b4e7c | 62 | libm_alias_ldouble (__trunc, trunc) |