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mathimpl.h revision 1.1 
      1 /*	$NetBSD: mathimpl.h,v 1.1 1995/10/10 23:36:31 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();
     95 extern double	__log__L();
     96 
     97 struct Double {double a, b;};
     98 double __exp__D __P((double, double));
     99 struct Double __log__D __P((double));
    100