| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* IEEE754 floating point arithmetic |
| 2 | * single precision |
| 3 | */ |
| 4 | /* |
| 5 | * MIPS floating point support |
| 6 | * Copyright (C) 1994-2000 Algorithmics Ltd. |
| 7 | * http://www.algor.co.uk |
| 8 | * |
| 9 | * ######################################################################## |
| 10 | * |
| 11 | * This program is free software; you can distribute it and/or modify it |
| 12 | * under the terms of the GNU General Public License (Version 2) as |
| 13 | * published by the Free Software Foundation. |
| 14 | * |
| 15 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 18 | * for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License along |
| 21 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 22 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 23 | * |
| 24 | * ######################################################################## |
| 25 | */ |
| 26 | |
| 27 | |
| 28 | #include "ieee754sp.h" |
| 29 | |
| 30 | int ieee754sp_finite(ieee754sp x) |
| 31 | { |
| 32 | return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; |
| 33 | } |
| 34 | |
| 35 | ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y) |
| 36 | { |
| 37 | CLEARCX; |
| 38 | SPSIGN(x) = SPSIGN(y); |
| 39 | return x; |
| 40 | } |
| 41 | |
| 42 | |
| 43 | ieee754sp ieee754sp_neg(ieee754sp x) |
| 44 | { |
| 45 | COMPXSP; |
| 46 | |
| 47 | EXPLODEXSP; |
| 48 | CLEARCX; |
| 49 | FLUSHXSP; |
| 50 | |
| 51 | if (xc == IEEE754_CLASS_SNAN) { |
| 52 | SETCX(IEEE754_INVALID_OPERATION); |
| 53 | return ieee754sp_nanxcpt(ieee754sp_indef(), "neg"); |
| 54 | } |
| 55 | |
| 56 | if (ieee754sp_isnan(x)) /* but not infinity */ |
| 57 | return ieee754sp_nanxcpt(x, "neg", x); |
| 58 | |
| 59 | /* quick fix up */ |
| 60 | SPSIGN(x) ^= 1; |
| 61 | return x; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | ieee754sp ieee754sp_abs(ieee754sp x) |
| 66 | { |
| 67 | COMPXSP; |
| 68 | |
| 69 | EXPLODEXSP; |
| 70 | CLEARCX; |
| 71 | FLUSHXSP; |
| 72 | |
| 73 | if (xc == IEEE754_CLASS_SNAN) { |
| 74 | SETCX(IEEE754_INVALID_OPERATION); |
| 75 | return ieee754sp_nanxcpt(ieee754sp_indef(), "abs"); |
| 76 | } |
| 77 | |
| 78 | if (ieee754sp_isnan(x)) /* but not infinity */ |
| 79 | return ieee754sp_nanxcpt(x, "abs", x); |
| 80 | |
| 81 | /* quick fix up */ |
| 82 | SPSIGN(x) = 0; |
| 83 | return x; |
| 84 | } |