projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* IEEE754 floating point arithmetic |
| 2 | * double precision: common utilities | |
| 3 | */ | |
| 4 | /* | |
| 5 | * MIPS floating point support | |
| 6 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
| 1da177e4 | 7 | * |
| 1da177e4 LT |
8 | * This program is free software; you can distribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License (Version 2) as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | * | |
| 12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 | * for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU General Public License along | |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
| 3f7cac41 | 19 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 1da177e4 LT |
20 | */ |
| 21 | ||
| 1da177e4 LT |
22 | #include "ieee754dp.h" |
| 23 | ||
| 2209bcb1 | 24 | union ieee754dp ieee754dp_neg(union ieee754dp x) |
| 1da177e4 | 25 | { |
| 232b6ec5 MR |
26 | union ieee754dp y; |
| 27 | ||
| 198f7058 MR |
28 | if (ieee754_csr.abs2008) { |
| 29 | y = x; | |
| 30 | DPSIGN(y) = !DPSIGN(x); | |
| 31 | } else { | |
| 32 | unsigned int oldrm; | |
| 33 | ||
| 34 | oldrm = ieee754_csr.rm; | |
| 35 | ieee754_csr.rm = FPU_CSR_RD; | |
| 36 | y = ieee754dp_sub(ieee754dp_zero(0), x); | |
| 37 | ieee754_csr.rm = oldrm; | |
| 38 | } | |
| 232b6ec5 | 39 | return y; |
| 1da177e4 LT |
40 | } |
| 41 | ||
| 2209bcb1 | 42 | union ieee754dp ieee754dp_abs(union ieee754dp x) |
| 1da177e4 | 43 | { |
| 232b6ec5 MR |
44 | union ieee754dp y; |
| 45 | ||
| 198f7058 MR |
46 | if (ieee754_csr.abs2008) { |
| 47 | y = x; | |
| 48 | DPSIGN(y) = 0; | |
| 49 | } else { | |
| 50 | unsigned int oldrm; | |
| 51 | ||
| 52 | oldrm = ieee754_csr.rm; | |
| 53 | ieee754_csr.rm = FPU_CSR_RD; | |
| 54 | if (DPSIGN(x)) | |
| 55 | y = ieee754dp_sub(ieee754dp_zero(0), x); | |
| 56 | else | |
| 57 | y = ieee754dp_add(ieee754dp_zero(0), x); | |
| 58 | ieee754_csr.rm = oldrm; | |
| 59 | } | |
| 232b6ec5 | 60 | return y; |
| 1da177e4 | 61 | } |