1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 2014 Garrett D'Amore <garrett@damore.org> 28 * 29 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 30 * Use is subject to license terms. 31 */ 32 33 #ifndef _VALUES_H 34 #define _VALUES_H 35 36 #include <sys/isa_defs.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /* 43 * These values work with any binary representation of integers 44 * where the high-order bit contains the sign. 45 */ 46 47 /* a number used normally for size of a shift */ 48 #define BITSPERBYTE 8 49 50 #define BITS(type) (BITSPERBYTE * (long)sizeof (type)) 51 52 /* short, regular and long ints with only the high-order bit turned on */ 53 #define HIBITS ((short)(1 << (BITS(short) - 1))) 54 55 #define HIBITI (1U << (BITS(int) - 1)) 56 #define HIBITL (1UL << (BITS(long) - 1)) 57 58 /* largest short, regular and long int */ 59 #define MAXSHORT ((short)~HIBITS) 60 #define MAXINT ((int)(~HIBITI)) 61 #define MAXLONG ((long)(~HIBITL)) 62 63 /* 64 * various values that describe the binary floating-point representation 65 * _EXPBASE - the exponent base 66 * DMAXEXP - the maximum exponent of a double (as returned by frexp()) 67 * FMAXEXP - the maximum exponent of a float (as returned by frexp()) 68 * DMINEXP - the minimum exponent of a double (as returned by frexp()) 69 * FMINEXP - the minimum exponent of a float (as returned by frexp()) 70 * MAXDOUBLE - the largest double 71 * ((_EXPBASE ** DMAXEXP) * (1 - (_EXPBASE ** -DSIGNIF))) 72 * MAXFLOAT - the largest float 73 * ((_EXPBASE ** FMAXEXP) * (1 - (_EXPBASE ** -FSIGNIF))) 74 * MINDOUBLE - the smallest double (_EXPBASE ** (DMINEXP - 1)) 75 * MINFLOAT - the smallest float (_EXPBASE ** (FMINEXP - 1)) 76 * DSIGNIF - the number of significant bits in a double 77 * FSIGNIF - the number of significant bits in a float 78 * DMAXPOWTWO - the largest power of two exactly representable as a double 79 * FMAXPOWTWO - the largest power of two exactly representable as a float 80 * _IEEE - 1 if IEEE standard representation is used 81 * _DEXPLEN - the number of bits for the exponent of a double 82 * _FEXPLEN - the number of bits for the exponent of a float 83 * _HIDDENBIT - 1 if high-significance bit of mantissa is implicit 84 * LN_MAXDOUBLE - the natural log of the largest double -- log(MAXDOUBLE) 85 * LN_MINDOUBLE - the natural log of the smallest double -- log(MINDOUBLE) 86 * LN_MAXFLOAT - the natural log of the largest float -- log(MAXFLOAT) 87 * LN_MINFLOAT - the natural log of the smallest float -- log(MINFLOAT) 88 */ 89 90 /* 91 * Currently, only IEEE-754 format is supported. 92 */ 93 #if defined(_IEEE_754) 94 #define MAXDOUBLE 1.79769313486231570e+308 95 #define MAXFLOAT ((float)3.40282346638528860e+38) 96 #define MINDOUBLE 4.94065645841246544e-324 97 #define MINFLOAT ((float)1.40129846432481707e-45) 98 #define _IEEE 1 99 #define _DEXPLEN 11 100 #define _HIDDENBIT 1 101 #define _LENBASE 1 102 #define DMINEXP (-(DMAXEXP + DSIGNIF - _HIDDENBIT - 3)) 103 #define FMINEXP (-(FMAXEXP + FSIGNIF - _HIDDENBIT - 3)) 104 #else 105 /* #error is strictly ansi-C, but works as well as anything for K&R systems. */ 106 #error "ISA not supported" 107 #endif 108 109 #define _EXPBASE (1 << _LENBASE) 110 #define _FEXPLEN 8 111 #define DSIGNIF (BITS(double) - _DEXPLEN + _HIDDENBIT - 1) 112 #define FSIGNIF (BITS(float) - _FEXPLEN + _HIDDENBIT - 1) 113 #define DMAXPOWTWO ((double)(1 << (BITS(int) - 2)) * \ 114 (1 << (DSIGNIF - BITS(int) + 1))) 115 #define FMAXPOWTWO ((float)(1 << (FSIGNIF - 1))) 116 #define DMAXEXP ((1 << (_DEXPLEN - 1)) - 1 + _IEEE) 117 #define FMAXEXP ((1 << (_FEXPLEN - 1)) - 1 + _IEEE) 118 #define LN_MAXDOUBLE (M_LN2 * DMAXEXP) 119 #define LN_MAXFLOAT (float)(M_LN2 * FMAXEXP) 120 #define LN_MINDOUBLE (M_LN2 * (DMINEXP - 1)) 121 #define LN_MINFLOAT (float)(M_LN2 * (FMINEXP - 1)) 122 #define H_PREC (DSIGNIF % 2 ? (1 << DSIGNIF/2) * M_SQRT2 : 1 << DSIGNIF/2) 123 #define FH_PREC \ 124 (float)(FSIGNIF % 2 ? (1 << FSIGNIF/2) * M_SQRT2 : 1 << FSIGNIF/2) 125 #define X_EPS (1.0/H_PREC) 126 #define FX_EPS (float)((float)1.0/FH_PREC) 127 #define X_PLOSS ((double)(int)(M_PI * H_PREC)) 128 #define FX_PLOSS ((float)(int)(M_PI * FH_PREC)) 129 #define X_TLOSS (M_PI * DMAXPOWTWO) 130 #define FX_TLOSS (float)(M_PI * FMAXPOWTWO) 131 #define M_LN2 0.69314718055994530942 132 #define M_PI 3.14159265358979323846 133 #define M_SQRT2 1.41421356237309504880 134 #define MAXBEXP DMAXEXP /* for backward compatibility */ 135 #define MINBEXP DMINEXP /* for backward compatibility */ 136 #define MAXPOWTWO DMAXPOWTWO /* for backward compatibility */ 137 138 #ifdef __cplusplus 139 } 140 #endif 141 142 #endif /* _VALUES_H */ 143