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/* 23 * Copyright 1989 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27/* Copyright (c) 1984 AT&T */ 28/* All Rights Reserved */ 29 30#pragma ident "%Z%%M% %I% %E% SMI" 31 32#ifndef _values_h 33#define _values_h 34 35/* These values work with any binary representation of integers 36 * where the high-order bit contains the sign. */ 37 38/* a number used normally for size of a shift */ 39#if gcos 40#define BITSPERBYTE 9 41#else 42#define BITSPERBYTE 8 43#endif 44#define BITS(type) (BITSPERBYTE * (int)sizeof(type)) 45 46/* short, regular and long ints with only the high-order bit turned on */ 47#define HIBITS ((short)(1 << BITS(short) - 1)) 48#define HIBITI (1U << BITS(int) - 1) 49#define HIBITL (1UL << BITS(long) - 1) 50 51/* largest short, regular and long int */ 52#define MAXSHORT ((short)~HIBITS) 53#define MAXINT ((int)~HIBITI) 54#define MAXLONG ((long)~HIBITL) 55 56/* various values that describe the binary floating-point representation 57 * _EXPBASE - the exponent base 58 * DMAXEXP - the maximum exponent of a double (as returned by frexp()) 59 * FMAXEXP - the maximum exponent of a float (as returned by frexp()) 60 * DMINEXP - the minimum exponent of a double (as returned by frexp()) 61 * FMINEXP - the minimum exponent of a float (as returned by frexp()) 62 * MAXDOUBLE - the largest double 63 ((_EXPBASE ** DMAXEXP) * (1 - (_EXPBASE ** -DSIGNIF))) 64 * MAXFLOAT - the largest float 65 ((_EXPBASE ** FMAXEXP) * (1 - (_EXPBASE ** -FSIGNIF))) 66 * MINDOUBLE - the smallest double (_EXPBASE ** (DMINEXP - 1)) 67 * MINFLOAT - the smallest float (_EXPBASE ** (FMINEXP - 1)) 68 * DSIGNIF - the number of significant bits in a double 69 * FSIGNIF - the number of significant bits in a float 70 * DMAXPOWTWO - the largest power of two exactly representable as a double 71 * FMAXPOWTWO - the largest power of two exactly representable as a float 72 * _IEEE - 1 if IEEE standard representation is used 73 * _DEXPLEN - the number of bits for the exponent of a double 74 * _FEXPLEN - the number of bits for the exponent of a float 75 * _HIDDENBIT - 1 if high-significance bit of mantissa is implicit 76 * LN_MAXDOUBLE - the natural log of the largest double -- log(MAXDOUBLE) 77 * LN_MINDOUBLE - the natural log of the smallest double -- log(MINDOUBLE) 78 * LN_MAXFLOAT - the natural log of the largest float 79 * LN_MINFLOAT - the natural log of the smallest float 80 */ 81#if u3b || u3b5 || sun 82#define MAXDOUBLE 1.797693134862315708e+308 83#define MAXFLOAT ((float)3.40282346638528860e+38) 84#define MINDOUBLE 4.94065645841246544e-324 85#define MINFLOAT ((float)1.40129846432481707e-45) 86#define _IEEE 1 87#define _DEXPLEN 11 88#define _HIDDENBIT 1 89#define DMINEXP (-(DMAXEXP + DSIGNIF - _HIDDENBIT - 3)) 90#define FMINEXP (-(FMAXEXP + FSIGNIF - _HIDDENBIT - 3)) 91#define LN_MAXFLOAT 8.8722839052068e+01 92#define LN_MINFLOAT -1.03278929903432e+02 93#endif 94#if pdp11 || vax 95#define MAXDOUBLE 1.701411834604692293e+38 96#define MAXFLOAT ((float)1.701411733192644299e+38) 97/* The following is kludged because the PDP-11 compilers botch the simple form. 98 The kludge causes the constant to be computed at run-time on the PDP-11, 99 even though it is still "folded" at compile-time on the VAX. */ 100#define MINDOUBLE (0.01 * 2.938735877055718770e-37) 101#define MINFLOAT ((float)MINDOUBLE) 102#define _IEEE 0 103#define _DEXPLEN 8 104#define _HIDDENBIT 1 105#define DMINEXP (-DMAXEXP) 106#define FMINEXP (-FMAXEXP) 107#endif 108#if gcos 109#define MAXDOUBLE 1.7014118346046923171e+38 110#define MAXFLOAT ((float)1.7014118219281863150e+38) 111#define MINDOUBLE 2.9387358770557187699e-39 112#define MINFLOAT ((float)MINDOUBLE) 113#define _IEEE 0 114#define _DEXPLEN 8 115#define _HIDDENBIT 0 116#define DMINEXP (-(DMAXEXP + 1)) 117#define FMINEXP (-(FMAXEXP + 1)) 118#endif 119#if u370 120#define _LENBASE 4 121#else 122#define _LENBASE 1 123#endif 124#define _EXPBASE (1 << _LENBASE) 125#define _FEXPLEN 8 126#define DSIGNIF (BITS(double) - _DEXPLEN + _HIDDENBIT - 1) 127#define FSIGNIF (BITS(float) - _FEXPLEN + _HIDDENBIT - 1) 128#define DMAXPOWTWO ((double)(1L << BITS(long) - 2) * \ 129 (1L << DSIGNIF - BITS(long) + 1)) 130#define FMAXPOWTWO ((float)(1L << FSIGNIF - 1)) 131#define DMAXEXP ((1 << _DEXPLEN - 1) - 1 + _IEEE) 132#define FMAXEXP ((1 << _FEXPLEN - 1) - 1 + _IEEE) 133#define LN_MAXDOUBLE (M_LN2 * DMAXEXP) 134#define LN_MINDOUBLE (M_LN2 * (DMINEXP - 1)) 135 136#define H_PREC (DSIGNIF % 2 ? (1L << DSIGNIF/2) * M_SQRT2 : 1L << DSIGNIF/2) 137#define X_EPS (1.0/H_PREC) 138#define X_PLOSS ((double)(long)(M_PI * H_PREC)) 139#define X_TLOSS (M_PI * DMAXPOWTWO) 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#endif /*!_values_h*/ 148