projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* Copyright (c) 1992, NeXT Computer, Inc. All rights reserved. | |
| 23 | * | |
| 24 | * File: libc/m98k/gen/fp.h | |
| 25 | * Author: Derek B Clegg, NeXT Computer, Inc. | |
| 26 | * | |
| 27 | * HISTORY | |
| 28 | * 11-Nov-92 Derek B Clegg (dclegg@next.com) | |
| 29 | * Created. | |
| 30 | * | |
| 31 | * Common definitions for floating-point numbers. | |
| 32 | */ | |
| 33 | ||
| 34 | /* The following definitions for for double precision IEEE format numbers. */ | |
| 35 | ||
| 36 | #define EXPONENT_BIAS 1023 | |
| 37 | ||
| 38 | #define SIGN_BITS 1 | |
| 39 | #define EXPONENT_BITS 11 | |
| 40 | #define FRACTION_BITS 52 | |
| 41 | #define HI_FRACTION_BITS 20 | |
| 42 | #define LO_FRACTION_BITS 32 | |
| 43 | ||
| 44 | struct double_format { | |
| 45 | unsigned sign: SIGN_BITS; | |
| 46 | unsigned exponent: EXPONENT_BITS; | |
| 47 | unsigned hi_fraction: HI_FRACTION_BITS; | |
| 48 | unsigned lo_fraction: LO_FRACTION_BITS; | |
| 49 | }; | |
| 50 | ||
| 51 | union dbl { | |
| 52 | struct double_format s; | |
| 53 | unsigned int u[2]; | |
| 54 | double value; | |
| 55 | }; | |
| 56 | ||
| 57 | #define PlusInfinity (1.0/0.0) | |
| 58 | #define MinusInfinity (-1.0/0.0) | |
| 59 | ||
| 60 | #define not_a_number(x) ((x) != (x)) | |
| 61 | #define positive_infinity(x) ((x) == PlusInfinity) | |
| 62 | #define negative_infinity(x) ((x) == MinusInfinity) |