projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| dfd2257a | 1 | /* Round long double value to long long int. |
| bfff8b1b | 2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
| dfd2257a | 3 | This file is part of the GNU C Library. |
| abfbdde1 | 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and |
| 350635a5 | 5 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. |
| dfd2257a 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. | |
| dfd2257a 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. |
| dfd2257a | 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/>. */ | |
| dfd2257a | 20 | |
| 8afdb7ac JM |
21 | #include <fenv.h> |
| 22 | #include <limits.h> | |
| dfd2257a UD |
23 | #include <math.h> |
| 24 | ||
| 1ed0291c | 25 | #include <math_private.h> |
| c4d17461 | 26 | #include <fix-fp-int-convert-overflow.h> |
| dfd2257a UD |
27 | |
| 28 | long long int | |
| 15089e04 | 29 | __llroundl (_Float128 x) |
| dfd2257a | 30 | { |
| abfbdde1 UD |
31 | int64_t j0; |
| 32 | u_int64_t i1, i0; | |
| dfd2257a UD |
33 | long long int result; |
| 34 | int sign; | |
| 35 | ||
| abfbdde1 UD |
36 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
| 37 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
| 38 | sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1; | |
| 39 | i0 &= 0x0000ffffffffffffLL; | |
| 40 | i0 |= 0x0001000000000000LL; | |
| dfd2257a | 41 | |
| abfbdde1 | 42 | if (j0 < 48) |
| dfd2257a UD |
43 | { |
| 44 | if (j0 < 0) | |
| 45 | return j0 < -1 ? 0 : sign; | |
| 46 | else | |
| 47 | { | |
| abfbdde1 UD |
48 | i0 += 0x0000800000000000LL >> j0; |
| 49 | result = i0 >> (48 - j0); | |
| dfd2257a UD |
50 | } |
| 51 | } | |
| cc3fa755 | 52 | else if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) |
| dfd2257a | 53 | { |
| abfbdde1 UD |
54 | if (j0 >= 112) |
| 55 | result = ((long long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); | |
| dfd2257a UD |
56 | else |
| 57 | { | |
| abfbdde1 | 58 | u_int64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48)); |
| dfd2257a UD |
59 | if (j < i1) |
| 60 | ++i0; | |
| 61 | ||
| 39007ae3 UD |
62 | if (j0 == 48) |
| 63 | result = (long long int) i0; | |
| 64 | else | |
| 8afdb7ac JM |
65 | { |
| 66 | result = ((long long int) i0 << (j0 - 48)) | (j >> (112 - j0)); | |
| 67 | #ifdef FE_INVALID | |
| 68 | if (sign == 1 && result == LLONG_MIN) | |
| 69 | /* Rounding brought the value out of range. */ | |
| 70 | feraiseexcept (FE_INVALID); | |
| 71 | #endif | |
| 72 | } | |
| dfd2257a UD |
73 | } |
| 74 | } | |
| 75 | else | |
| 76 | { | |
| 8afdb7ac JM |
77 | /* The number is too large. Unless it rounds to LLONG_MIN, |
| 78 | FE_INVALID must be raised and the return value is | |
| 79 | unspecified. */ | |
| 80 | #ifdef FE_INVALID | |
| c4d17461 | 81 | if (FIX_LDBL_LLONG_CONVERT_OVERFLOW |
| 02bbfb41 | 82 | && !(sign == -1 && x > (_Float128) LLONG_MIN - L(0.5))) |
| c4d17461 SL |
83 | { |
| 84 | feraiseexcept (FE_INVALID); | |
| 85 | return sign == 1 ? LLONG_MAX : LLONG_MIN; | |
| 86 | } | |
| 87 | else if (!FIX_LDBL_LLONG_CONVERT_OVERFLOW | |
| 02bbfb41 | 88 | && x <= (_Float128) LLONG_MIN - L(0.5)) |
| 8afdb7ac JM |
89 | { |
| 90 | /* If truncation produces LLONG_MIN, the cast will not raise | |
| 91 | the exception, but may raise "inexact". */ | |
| 92 | feraiseexcept (FE_INVALID); | |
| 93 | return LLONG_MIN; | |
| 94 | } | |
| 95 | #endif | |
| dfd2257a UD |
96 | return (long long int) x; |
| 97 | } | |
| 98 | ||
| 99 | return sign * result; | |
| 100 | } | |
| 101 | ||
| 102 | weak_alias (__llroundl, llroundl) |