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 #ifndef _values_h 31 #define _values_h 32 33 /* hardcoded --jrmarino */ 34 #define bsdmachine 1 35 36 /* These values work with any binary representation of integers 37 * where the high-order bit contains the sign. */ 38 39 /* a number used normally for size of a shift */ 40 #if gcos 41 #define BITSPERBYTE 9 42 #else 43 #define BITSPERBYTE 8 44 #endif 45 #define BITS(type) (BITSPERBYTE * (int)sizeof(type)) 46 47 /* short, regular and long ints with only the high-order bit turned on */ 48 #define HIBITS ((short)(1 << BITS(short) - 1)) 49 #define HIBITI (1U << BITS(int) - 1) 50 #define HIBITL (1UL << BITS(long) - 1) 51 52 /* largest short, regular and long int */ 53 #define MAXSHORT ((short)~HIBITS) 54 #define MAXINT ((int)~HIBITI) 55 #define MAXLONG ((long)~HIBITL) 56 57 /* various values that describe the binary floating-point representation 58 * _EXPBASE - the exponent base 59 * DMAXEXP - the maximum exponent of a double (as returned by frexp()) 60 * FMAXEXP - the maximum exponent of a float (as returned by frexp()) 61 * DMINEXP - the minimum exponent of a double (as returned by frexp()) 62 * FMINEXP - the minimum exponent of a float (as returned by frexp()) 63 * MAXDOUBLE - the largest double 64 ((_EXPBASE ** DMAXEXP) * (1 - (_EXPBASE ** -DSIGNIF))) 65 * MAXFLOAT - the largest float 66 ((_EXPBASE ** FMAXEXP) * (1 - (_EXPBASE ** -FSIGNIF))) 67 * MINDOUBLE - the smallest double (_EXPBASE ** (DMINEXP - 1)) 68 * MINFLOAT - the smallest float (_EXPBASE ** (FMINEXP - 1)) 69 * DSIGNIF - the number of significant bits in a double 70 * FSIGNIF - the number of significant bits in a float 71 * DMAXPOWTWO - the largest power of two exactly representable as a double 72 * FMAXPOWTWO - the largest power of two exactly representable as a float 73 * _IEEE - 1 if IEEE standard representation is used 74 * _DEXPLEN - the number of bits for the exponent of a double 75 * _FEXPLEN - the number of bits for the exponent of a float 76 * _HIDDENBIT - 1 if high-significance bit of mantissa is implicit 77 * LN_MAXDOUBLE - the natural log of the largest double -- log(MAXDOUBLE) 78 * LN_MINDOUBLE - the natural log of the smallest double -- log(MINDOUBLE) 79 * LN_MAXFLOAT - the natural log of the largest float 80 * LN_MINFLOAT - the natural log of the smallest float 81 */ 82 #if u3b || u3b5 || sun || bsdmachine 83 #define MAXDOUBLE 1.797693134862315708e+308 84 #define MAXFLOAT ((float)3.40282346638528860e+38) 85 #define MINDOUBLE 4.94065645841246544e-324 86 #define MINFLOAT ((float)1.40129846432481707e-45) 87 #define _IEEE 1 88 #define _DEXPLEN 11 89 #define _HIDDENBIT 1 90 #define DMINEXP (-(DMAXEXP + DSIGNIF - _HIDDENBIT - 3)) 91 #define FMINEXP (-(FMAXEXP + FSIGNIF - _HIDDENBIT - 3)) 92 #define LN_MAXFLOAT 8.8722839052068e+01 93 #define LN_MINFLOAT -1.03278929903432e+02 94 #endif 95 #if pdp11 || vax 96 #define MAXDOUBLE 1.701411834604692293e+38 97 #define MAXFLOAT ((float)1.701411733192644299e+38) 98 /* The following is kludged because the PDP-11 compilers botch the simple form. 99 The kludge causes the constant to be computed at run-time on the PDP-11, 100 even though it is still "folded" at compile-time on the VAX. */ 101 #define MINDOUBLE (0.01 * 2.938735877055718770e-37) 102 #define MINFLOAT ((float)MINDOUBLE) 103 #define _IEEE 0 104 #define _DEXPLEN 8 105 #define _HIDDENBIT 1 106 #define DMINEXP (-DMAXEXP) 107 #define FMINEXP (-FMAXEXP) 108 #endif 109 #if gcos 110 #define MAXDOUBLE 1.7014118346046923171e+38 111 #define MAXFLOAT ((float)1.7014118219281863150e+38) 112 #define MINDOUBLE 2.9387358770557187699e-39 113 #define MINFLOAT ((float)MINDOUBLE) 114 #define _IEEE 0 115 #define _DEXPLEN 8 116 #define _HIDDENBIT 0 117 #define DMINEXP (-(DMAXEXP + 1)) 118 #define FMINEXP (-(FMAXEXP + 1)) 119 #endif 120 #if u370 121 #define _LENBASE 4 122 #else 123 #define _LENBASE 1 124 #endif 125 #define _EXPBASE (1 << _LENBASE) 126 #define _FEXPLEN 8 127 #define DSIGNIF (BITS(double) - _DEXPLEN + _HIDDENBIT - 1) 128 #define FSIGNIF (BITS(float) - _FEXPLEN + _HIDDENBIT - 1) 129 #define DMAXPOWTWO ((double)(1L << (BITS(int) - 2)) * \ 130 (1L << (DSIGNIF - BITS(int) + 1))) 131 #define FMAXPOWTWO ((float)(1L << FSIGNIF - 1)) 132 #define DMAXEXP ((1 << _DEXPLEN - 1) - 1 + _IEEE) 133 #define FMAXEXP ((1 << _FEXPLEN - 1) - 1 + _IEEE) 134 #define LN_MAXDOUBLE (M_LN2 * DMAXEXP) 135 #define LN_MINDOUBLE (M_LN2 * (DMINEXP - 1)) 136 137 #define H_PREC (DSIGNIF % 2 ? (1L << DSIGNIF/2) * M_SQRT2 : 1L << DSIGNIF/2) 138 #define X_EPS (1.0/H_PREC) 139 #define X_PLOSS ((double)(long)(M_PI * H_PREC)) 140 #define X_TLOSS (M_PI * DMAXPOWTWO) 141 #define M_LN2 0.69314718055994530942 142 #define M_PI 3.14159265358979323846 143 #define M_SQRT2 1.41421356237309504880 144 #define MAXBEXP DMAXEXP /* for backward compatibility */ 145 #define MINBEXP DMINEXP /* for backward compatibility */ 146 #define MAXPOWTWO DMAXPOWTWO /* for backward compatibility */ 147 148 #endif /*!_values_h*/ 149