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