projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 63551311 | 1 | /* Round long double to integer away from zero. |
| 6d7e8eda | 2 | Copyright (C) 1997-2023 Free Software Foundation, Inc. |
| 63551311 | 3 | This file is part of the GNU C Library. |
| 63551311 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. | |
| 63551311 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. |
| 63551311 | 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/>. */ |
| 63551311 | 18 | |
| 9755bc46 | 19 | #define NO_MATH_REDIRECT |
| 63551311 UD |
20 | #include <math.h> |
| 21 | ||
| 1ed0291c | 22 | #include <math_private.h> |
| fd3b4e7c | 23 | #include <libm-alias-ldouble.h> |
| f82996f8 | 24 | #include <math-use-builtins.h> |
| 63551311 UD |
25 | |
| 26 | ||
| 15089e04 PM |
27 | _Float128 |
| 28 | __roundl (_Float128 x) | |
| 63551311 | 29 | { |
| f82996f8 SL |
30 | #if USE_ROUNDL_BUILTIN |
| 31 | return __builtin_roundl (x); | |
| 32 | #else | |
| 33 | /* Use generic implementation. */ | |
| 63551311 | 34 | int32_t j0; |
| 24ab7723 | 35 | uint64_t i1, i0; |
| 63551311 | 36 | |
| abfbdde1 UD |
37 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
| 38 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
| 7d0b2575 | 39 | if (j0 < 48) |
| 63551311 UD |
40 | { |
| 41 | if (j0 < 0) | |
| 42 | { | |
| 078d1cf8 JM |
43 | i0 &= 0x8000000000000000ULL; |
| 44 | if (j0 == -1) | |
| 45 | i0 |= 0x3fff000000000000LL; | |
| 46 | i1 = 0; | |
| 63551311 UD |
47 | } |
| 48 | else | |
| 49 | { | |
| 24ab7723 | 50 | uint64_t i = 0x0000ffffffffffffLL >> j0; |
| 63551311 UD |
51 | if (((i0 & i) | i1) == 0) |
| 52 | /* X is integral. */ | |
| 53 | return x; | |
| 078d1cf8 JM |
54 | |
| 55 | i0 += 0x0000800000000000LL >> j0; | |
| 56 | i0 &= ~i; | |
| 57 | i1 = 0; | |
| 63551311 UD |
58 | } |
| 59 | } | |
| abfbdde1 | 60 | else if (j0 > 111) |
| 63551311 UD |
61 | { |
| 62 | if (j0 == 0x4000) | |
| 63 | /* Inf or NaN. */ | |
| 64 | return x + x; | |
| 65 | else | |
| 66 | return x; | |
| 67 | } | |
| 68 | else | |
| 69 | { | |
| 24ab7723 | 70 | uint64_t i = -1ULL >> (j0 - 48); |
| 63551311 UD |
71 | if ((i1 & i) == 0) |
| 72 | /* X is integral. */ | |
| 73 | return x; | |
| 74 | ||
| 24ab7723 | 75 | uint64_t j = i1 + (1LL << (111 - j0)); |
| 078d1cf8 JM |
76 | if (j < i1) |
| 77 | i0 += 1; | |
| 78 | i1 = j; | |
| 63551311 UD |
79 | i1 &= ~i; |
| 80 | } | |
| 81 | ||
| abfbdde1 | 82 | SET_LDOUBLE_WORDS64 (x, i0, i1); |
| 63551311 | 83 | return x; |
| f82996f8 | 84 | #endif /* ! USE_ROUNDL_BUILTIN */ |
| 63551311 | 85 | } |
| fd3b4e7c | 86 | libm_alias_ldouble (__round, round) |