projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 63551311 | 1 | /* Round long double to integer away from zero. |
| 04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
| 63551311 | 3 | This file is part of the GNU C Library. |
| abfbdde1 UD |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and |
| 5 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. | |
| 63551311 UD |
6 | |
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either | |
| 10 | version 2.1 of the License, or (at your option) any later version. | |
| 63551311 UD |
11 | |
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 15 | Lesser General Public License for more details. |
| 63551311 | 16 | |
| 41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
| 19 | <http://www.gnu.org/licenses/>. */ | |
| 63551311 | 20 | |
| 9755bc46 | 21 | #define NO_MATH_REDIRECT |
| 63551311 UD |
22 | #include <math.h> |
| 23 | ||
| 1ed0291c | 24 | #include <math_private.h> |
| fd3b4e7c | 25 | #include <libm-alias-ldouble.h> |
| 63551311 UD |
26 | |
| 27 | ||
| 15089e04 PM |
28 | _Float128 |
| 29 | __roundl (_Float128 x) | |
| 63551311 UD |
30 | { |
| 31 | int32_t j0; | |
| 24ab7723 | 32 | uint64_t i1, i0; |
| 63551311 | 33 | |
| abfbdde1 UD |
34 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
| 35 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
| 7d0b2575 | 36 | if (j0 < 48) |
| 63551311 UD |
37 | { |
| 38 | if (j0 < 0) | |
| 39 | { | |
| 078d1cf8 JM |
40 | i0 &= 0x8000000000000000ULL; |
| 41 | if (j0 == -1) | |
| 42 | i0 |= 0x3fff000000000000LL; | |
| 43 | i1 = 0; | |
| 63551311 UD |
44 | } |
| 45 | else | |
| 46 | { | |
| 24ab7723 | 47 | uint64_t i = 0x0000ffffffffffffLL >> j0; |
| 63551311 UD |
48 | if (((i0 & i) | i1) == 0) |
| 49 | /* X is integral. */ | |
| 50 | return x; | |
| 078d1cf8 JM |
51 | |
| 52 | i0 += 0x0000800000000000LL >> j0; | |
| 53 | i0 &= ~i; | |
| 54 | i1 = 0; | |
| 63551311 UD |
55 | } |
| 56 | } | |
| abfbdde1 | 57 | else if (j0 > 111) |
| 63551311 UD |
58 | { |
| 59 | if (j0 == 0x4000) | |
| 60 | /* Inf or NaN. */ | |
| 61 | return x + x; | |
| 62 | else | |
| 63 | return x; | |
| 64 | } | |
| 65 | else | |
| 66 | { | |
| 24ab7723 | 67 | uint64_t i = -1ULL >> (j0 - 48); |
| 63551311 UD |
68 | if ((i1 & i) == 0) |
| 69 | /* X is integral. */ | |
| 70 | return x; | |
| 71 | ||
| 24ab7723 | 72 | uint64_t j = i1 + (1LL << (111 - j0)); |
| 078d1cf8 JM |
73 | if (j < i1) |
| 74 | i0 += 1; | |
| 75 | i1 = j; | |
| 63551311 UD |
76 | i1 &= ~i; |
| 77 | } | |
| 78 | ||
| abfbdde1 | 79 | SET_LDOUBLE_WORDS64 (x, i0, i1); |
| 63551311 UD |
80 | return x; |
| 81 | } | |
| fd3b4e7c | 82 | libm_alias_ldouble (__round, round) |