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1 | /* Round __float128 value to long int. |
| 92920cc6 |
2 | Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and |
| 5 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. |
| 6 | |
| 7 | The GNU C Library is free software; you can redistribute it and/or |
| 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. |
| 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 |
| 15 | Lesser General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU Lesser General Public |
| 18 | License along with the GNU C Library; if not, write to the Free |
| 19 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 20 | 02111-1307 USA. */ |
| 21 | |
| 22 | #include "quadmath-imp.h" |
| 23 | |
| 24 | |
| 25 | long int |
| 26 | lroundq (__float128 x) |
| 27 | { |
| 28 | int64_t j0; |
| 29 | uint64_t i1, i0; |
| 30 | long int result; |
| 31 | int sign; |
| 32 | |
| 33 | GET_FLT128_WORDS64 (i0, i1, x); |
| 34 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
| 35 | sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1; |
| 36 | i0 &= 0x0000ffffffffffffLL; |
| 37 | i0 |= 0x0001000000000000LL; |
| 38 | |
| 39 | if (j0 < 48) |
| 40 | { |
| 41 | if (j0 < 0) |
| 42 | return j0 < -1 ? 0 : sign; |
| 43 | else |
| 44 | { |
| 45 | i0 += 0x0000800000000000LL >> j0; |
| 46 | result = i0 >> (48 - j0); |
| 47 | } |
| 48 | } |
| 49 | else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) |
| 50 | { |
| 51 | if (j0 >= 112) |
| 52 | result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); |
| 53 | else |
| 54 | { |
| 55 | uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48)); |
| 56 | if (j < i1) |
| 57 | ++i0; |
| 58 | |
| 59 | if (j0 == 48) |
| 60 | result = (long int) i0; |
| 61 | else |
| 62 | result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0)); |
| 63 | } |
| 64 | } |
| 65 | else |
| 66 | { |
| 67 | /* The number is too large. It is left implementation defined |
| 68 | what happens. */ |
| 69 | return (long int) x; |
| 70 | } |
| 71 | |
| 72 | return sign * result; |
| 73 | } |
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