1 /*- 2 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org> 3 * Copyright (c) 2002 David Schultz <das@FreeBSD.ORG> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: src/lib/libc/include/fpmath.h,v 1.4 2008/12/23 22:20:59 marcel Exp $ 28 */ 29 #ifndef _FPMATH_H_ 30 #define _FPMATH_H_ 31 32 // Currently assumes Intel platform 33 #if defined (__i386__) || defined(__x86_64__) 34 #ifdef __LP64__ 35 #include "amd64_fpmath.h" 36 #else 37 #include "i386_fpmath.h" 38 #endif 39 #endif 40 41 #if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) 42 43 /* Definitions provided directly by GCC and Clang. */ 44 #define _LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ 45 #define _BIG_ENDIAN __ORDER_BIG_ENDIAN__ 46 #define _PDP_ENDIAN __ORDER_PDP_ENDIAN__ 47 #define _BYTE_ORDER __BYTE_ORDER__ 48 49 #elif defined(__linux) 50 51 #include <features.h> 52 #include <endian.h> 53 #define _LITTLE_ENDIAN __LITTLE_ENDIAN 54 #define _BIG_ENDIAN __BIG_ENDIAN 55 #define _PDP_ENDIAN __PDP_ENDIAN 56 #define _BYTE_ORDER __BYTE_ORDER 57 58 #elif defined(__APPLE__) 59 60 #include <machine/endian.h> 61 #define _LITTLE_ENDIAN LITTLE_ENDIAN 62 #define _BIG_ENDIAN BIG_ENDIAN 63 #define _PDP_ENDIAN PDP_ENDIAN 64 #define _BYTE_ORDER BYTE_ORDER 65 66 #elif defined(__FreeBSD__) 67 68 #include <machine/endian.h> 69 70 #elif defined(_WIN32) 71 72 #define _LITTLE_ENDIAN 1234 73 #define _BIG_ENDIAN 4321 74 #define _PDP_ENDIAN 3412 75 #define _BYTE_ORDER _LITTLE_ENDIAN 76 #define _FLOAT_WORD_ORDER _LITTLE_ENDIAN 77 #define LITTLE_ENDIAN _LITTLE_ENDIAN 78 #define BIG_ENDIAN _BIG_ENDIAN 79 #define PDP_ENDIAN _PDP_ENDIAN 80 #define BYTE_ORDER _BYTE_ORDER 81 82 #endif 83 84 #ifndef _IEEE_WORD_ORDER 85 #define _IEEE_WORD_ORDER _BYTE_ORDER 86 #endif 87 88 union IEEEf2bits { 89 float f; 90 struct { 91 #if _BYTE_ORDER == _LITTLE_ENDIAN 92 unsigned int man :23; 93 unsigned int exp :8; 94 unsigned int sign :1; 95 #else /* _BIG_ENDIAN */ 96 unsigned int sign :1; 97 unsigned int exp :8; 98 unsigned int man :23; 99 #endif 100 } bits; 101 }; 102 103 #define DBL_MANH_SIZE 20 104 #define DBL_MANL_SIZE 32 105 106 union IEEEd2bits { 107 double d; 108 struct { 109 #if _BYTE_ORDER == _LITTLE_ENDIAN 110 #if _IEEE_WORD_ORDER == _LITTLE_ENDIAN 111 unsigned int manl :32; 112 #endif 113 unsigned int manh :20; 114 unsigned int exp :11; 115 unsigned int sign :1; 116 #if _IEEE_WORD_ORDER == _BIG_ENDIAN 117 unsigned int manl :32; 118 #endif 119 #else /* _BIG_ENDIAN */ 120 unsigned int sign :1; 121 unsigned int exp :11; 122 unsigned int manh :20; 123 unsigned int manl :32; 124 #endif 125 } bits; 126 }; 127 128 #endif 129