1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)mathimpl.h 8.1 (Berkeley) 6/4/93 30 */ 31 32 #include <sys/cdefs.h> 33 #include <math.h> 34 35 #if defined(vax)||defined(tahoe) 36 37 /* Deal with different ways to concatenate in cpp */ 38 # ifdef __STDC__ 39 # define cat3(a,b,c) a ## b ## c 40 # else 41 # define cat3(a,b,c) a/**/b/**/c 42 # endif 43 44 /* Deal with vax/tahoe byte order issues */ 45 # ifdef vax 46 # define cat3t(a,b,c) cat3(a,b,c) 47 # else 48 # define cat3t(a,b,c) cat3(a,c,b) 49 # endif 50 51 # define vccast(name) (*(const double *)(cat3(name,,x))) 52 53 /* 54 * Define a constant to high precision on a Vax or Tahoe. 55 * 56 * Args are the name to define, the decimal floating point value, 57 * four 16-bit chunks of the float value in hex 58 * (because the vax and tahoe differ in float format!), the power 59 * of 2 of the hex-float exponent, and the hex-float mantissa. 60 * Most of these arguments are not used at compile time; they are 61 * used in a post-check to make sure the constants were compiled 62 * correctly. 63 * 64 * People who want to use the constant will have to do their own 65 * #define foo vccast(foo) 66 * since CPP cannot do this for them from inside another macro (sigh). 67 * We define "vccast" if this needs doing. 68 */ 69 # define vc(name, value, x1,x2,x3,x4, bexp, xval) \ 70 const static long cat3(name,,x)[] = {cat3t(0x,x1,x2), cat3t(0x,x3,x4)}; 71 72 # define ic(name, value, bexp, xval) ; 73 74 #else /* vax or tahoe */ 75 76 /* Hooray, we have an IEEE machine */ 77 # undef vccast 78 # define vc(name, value, x1,x2,x3,x4, bexp, xval) ; 79 80 # define ic(name, value, bexp, xval) \ 81 const static double name = value; 82 83 #endif /* defined(vax)||defined(tahoe) */ 84 85 86 /* 87 * Functions internal to the math package, yet not static. 88 */ 89 extern double __exp__E(); 90 extern double __log__L(); 91 92 struct Double {double a, b;}; 93 double __exp__D __P((double, double)); 94 struct Double __log__D __P((double)); 95 96 /* 97 * All externs exported after this point 98 */ 99 #if defined(_BLD_ast) && defined(__EXPORT__) 100 #define extern __EXPORT__ 101 #endif 102 103 extern double copysign(double, double); 104