projects / apple / libc.git / blame
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|---|---|---|
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1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 59e0d9fe A |
6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| 7 | * | |
| 734aad71 A |
8 | * This file contains Original Code and/or Modifications of Original Code |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| e9ce8d39 A |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
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19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| e9ce8d39 A |
22 | * |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | /* Copyright (c) 1992, NeXT Computer, Inc. All rights reserved. | |
| 26 | * | |
| 27 | * File: libc/m98k/gen/fp.h | |
| 28 | * Author: Derek B Clegg, NeXT Computer, Inc. | |
| 29 | * | |
| 30 | * HISTORY | |
| 31 | * 11-Nov-92 Derek B Clegg (dclegg@next.com) | |
| 32 | * Created. | |
| 33 | * | |
| 34 | * Common definitions for floating-point numbers. | |
| 35 | */ | |
| 36 | ||
| 37 | /* The following definitions for for double precision IEEE format numbers. */ | |
| 38 | ||
| 39 | #define EXPONENT_BIAS 1023 | |
| 40 | ||
| 41 | #define SIGN_BITS 1 | |
| 42 | #define EXPONENT_BITS 11 | |
| 43 | #define FRACTION_BITS 52 | |
| 44 | #define HI_FRACTION_BITS 20 | |
| 45 | #define LO_FRACTION_BITS 32 | |
| 46 | ||
| 47 | struct double_format { | |
| 48 | unsigned sign: SIGN_BITS; | |
| 49 | unsigned exponent: EXPONENT_BITS; | |
| 50 | unsigned hi_fraction: HI_FRACTION_BITS; | |
| 51 | unsigned lo_fraction: LO_FRACTION_BITS; | |
| 52 | }; | |
| 53 | ||
| 54 | union dbl { | |
| 55 | struct double_format s; | |
| 56 | unsigned int u[2]; | |
| 57 | double value; | |
| 58 | }; | |
| 59 | ||
| 60 | #define PlusInfinity (1.0/0.0) | |
| 61 | #define MinusInfinity (-1.0/0.0) | |
| 62 | ||
| 63 | #define not_a_number(x) ((x) != (x)) | |
| 64 | #define positive_infinity(x) ((x) == PlusInfinity) | |
| 65 | #define negative_infinity(x) ((x) == MinusInfinity) |