1 /* $NetBSD: mathimpl.h,v 1.4 1998/11/08 19:29:34 ragge Exp $ */ 2 /* 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)mathimpl.h 8.1 (Berkeley) 6/4/93 35 */ 36 37 #include <sys/cdefs.h> 38 #include <math.h> 39 40 #if defined(__vax__)||defined(tahoe) 41 42 /* Deal with different ways to concatenate in cpp */ 43 # ifdef __STDC__ 44 # define cat3(a,b,c) a ## b ## c 45 # else 46 # define cat3(a,b,c) a/**/b/**/c 47 # endif 48 49 /* Deal with vax/tahoe byte order issues */ 50 # ifdef __vax__ 51 # define cat3t(a,b,c) cat3(a,b,c) 52 # else 53 # define cat3t(a,b,c) cat3(a,c,b) 54 # endif 55 56 # define vccast(name) (*(const double *)(cat3(name,,x))) 57 58 /* 59 * Define a constant to high precision on a Vax or Tahoe. 60 * 61 * Args are the name to define, the decimal floating point value, 62 * four 16-bit chunks of the float value in hex 63 * (because the vax and tahoe differ in float format!), the power 64 * of 2 of the hex-float exponent, and the hex-float mantissa. 65 * Most of these arguments are not used at compile time; they are 66 * used in a post-check to make sure the constants were compiled 67 * correctly. 68 * 69 * People who want to use the constant will have to do their own 70 * #define foo vccast(foo) 71 * since CPP cannot do this for them from inside another macro (sigh). 72 * We define "vccast" if this needs doing. 73 */ 74 # define vc(name, value, x1,x2,x3,x4, bexp, xval) \ 75 const static long cat3(name,,x)[] = {cat3t(0x,x1,x2), cat3t(0x,x3,x4)}; 76 77 # define ic(name, value, bexp, xval) ; 78 79 #else /* __vax__ or tahoe */ 80 81 /* Hooray, we have an IEEE machine */ 82 # undef vccast 83 # define vc(name, value, x1,x2,x3,x4, bexp, xval) ; 84 85 # define ic(name, value, bexp, xval) \ 86 const static double name = value; 87 88 #endif /* defined(__vax__)||defined(tahoe) */ 89 90 91 /* 92 * Functions internal to the math package, yet not static. 93 */ 94 extern double __exp__E __P((double, double)); 95 extern double __log__L __P((double)); 96 extern int infnan __P((int)); 97 98 struct Double {double a, b;}; 99 double __exp__D __P((double, double)); 100 struct Double __log__D __P((double)); 101