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 2004 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #ifndef _VALUES_H 32 #define _VALUES_H 33 34 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.33 */ 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 #if defined(__STDC__) 56 57 #define HIBITI (1U << (BITS(int) - 1)) 58 #define HIBITL (1UL << (BITS(long) - 1)) 59 60 #else 61 62 #define HIBITI ((unsigned)1 << (BITS(int) - 1)) 63 #define HIBITL (1L << (BITS(long) - 1)) 64 65 #endif 66 67 /* largest short, regular and long int */ 68 #define MAXSHORT ((short)~HIBITS) 69 #define MAXINT ((int)(~HIBITI)) 70 #define MAXLONG ((long)(~HIBITL)) 71 72 /* 73 * various values that describe the binary floating-point representation 74 * _EXPBASE - the exponent base 75 * DMAXEXP - the maximum exponent of a double (as returned by frexp()) 76 * FMAXEXP - the maximum exponent of a float (as returned by frexp()) 77 * DMINEXP - the minimum exponent of a double (as returned by frexp()) 78 * FMINEXP - the minimum exponent of a float (as returned by frexp()) 79 * MAXDOUBLE - the largest double 80 * ((_EXPBASE ** DMAXEXP) * (1 - (_EXPBASE ** -DSIGNIF))) 81 * MAXFLOAT - the largest float 82 * ((_EXPBASE ** FMAXEXP) * (1 - (_EXPBASE ** -FSIGNIF))) 83 * MINDOUBLE - the smallest double (_EXPBASE ** (DMINEXP - 1)) 84 * MINFLOAT - the smallest float (_EXPBASE ** (FMINEXP - 1)) 85 * DSIGNIF - the number of significant bits in a double 86 * FSIGNIF - the number of significant bits in a float 87 * DMAXPOWTWO - the largest power of two exactly representable as a double 88 * FMAXPOWTWO - the largest power of two exactly representable as a float 89 * _IEEE - 1 if IEEE standard representation is used 90 * _DEXPLEN - the number of bits for the exponent of a double 91 * _FEXPLEN - the number of bits for the exponent of a float 92 * _HIDDENBIT - 1 if high-significance bit of mantissa is implicit 93 * LN_MAXDOUBLE - the natural log of the largest double -- log(MAXDOUBLE) 94 * LN_MINDOUBLE - the natural log of the smallest double -- log(MINDOUBLE) 95 * LN_MAXFLOAT - the natural log of the largest float -- log(MAXFLOAT) 96 * LN_MINFLOAT - the natural log of the smallest float -- log(MINFLOAT) 97 */ 98 99 /* 100 * Currently, only IEEE-754 format is supported. 101 */ 102 #if defined(_IEEE_754) 103 #define MAXDOUBLE 1.79769313486231570e+308 104 #define MAXFLOAT ((float)3.40282346638528860e+38) 105 #define MINDOUBLE 4.94065645841246544e-324 106 #define MINFLOAT ((float)1.40129846432481707e-45) 107 #define _IEEE 1 108 #define _DEXPLEN 11 109 #define _HIDDENBIT 1 110 #define _LENBASE 1 111 #define DMINEXP (-(DMAXEXP + DSIGNIF - _HIDDENBIT - 3)) 112 #define FMINEXP (-(FMAXEXP + FSIGNIF - _HIDDENBIT - 3)) 113 #else 114 /* #error is strictly ansi-C, but works as well as anything for K&R systems. */ 115 #error "ISA not supported" 116 #endif 117 118 #define _EXPBASE (1 << _LENBASE) 119 #define _FEXPLEN 8 120 #define DSIGNIF (BITS(double) - _DEXPLEN + _HIDDENBIT - 1) 121 #define FSIGNIF (BITS(float) - _FEXPLEN + _HIDDENBIT - 1) 122 #define DMAXPOWTWO ((double)(1 << (BITS(int) - 2)) * \ 123 (1 << (DSIGNIF - BITS(int) + 1))) 124 #define FMAXPOWTWO ((float)(1 << (FSIGNIF - 1))) 125 #define DMAXEXP ((1 << (_DEXPLEN - 1)) - 1 + _IEEE) 126 #define FMAXEXP ((1 << (_FEXPLEN - 1)) - 1 + _IEEE) 127 #define LN_MAXDOUBLE (M_LN2 * DMAXEXP) 128 #define LN_MAXFLOAT (float)(M_LN2 * FMAXEXP) 129 #define LN_MINDOUBLE (M_LN2 * (DMINEXP - 1)) 130 #define LN_MINFLOAT (float)(M_LN2 * (FMINEXP - 1)) 131 #define H_PREC (DSIGNIF % 2 ? (1 << DSIGNIF/2) * M_SQRT2 : 1 << DSIGNIF/2) 132 #define FH_PREC \ 133 (float)(FSIGNIF % 2 ? (1 << FSIGNIF/2) * M_SQRT2 : 1 << FSIGNIF/2) 134 #define X_EPS (1.0/H_PREC) 135 #define FX_EPS (float)((float)1.0/FH_PREC) 136 #define X_PLOSS ((double)(int)(M_PI * H_PREC)) 137 #define FX_PLOSS ((float)(int)(M_PI * FH_PREC)) 138 #define X_TLOSS (M_PI * DMAXPOWTWO) 139 #define FX_TLOSS (float)(M_PI * FMAXPOWTWO) 140 #define M_LN2 0.69314718055994530942 141 #define M_PI 3.14159265358979323846 142 #define M_SQRT2 1.41421356237309504880 143 #define MAXBEXP DMAXEXP /* for backward compatibility */ 144 #define MINBEXP DMINEXP /* for backward compatibility */ 145 #define MAXPOWTWO DMAXPOWTWO /* for backward compatibility */ 146 147 #ifdef __cplusplus 148 } 149 #endif 150 151 #endif /* _VALUES_H */ 152