1 /*
2  * Copyright (c) 1988 The Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  *
7  * All recipients should regard themselves as participants in an ongoing
8  * research project and hence should feel obligated to report their
9  * experiences (good or bad) with these elementary function codes, using
10  * the sendbug(8) program, to the authors.
11  *
12  *	@(#)mathimpl.h	5.2 (Berkeley) 06/01/90
13  */
14 
15 #include <math.h>
16 
17 #ifdef __STDC__
18 #define const const
19 #else
20 #define const /**/
21 #endif
22 
23 #if defined(vax)||defined(tahoe)
24 
25 /* Deal with different ways to concatenate in cpp */
26 #  ifdef __STDC__
27 #    define	cat3(a,b,c) a ## b ## c
28 #  else
29 #    define	cat3(a,b,c) a/**/b/**/c
30 #  endif
31 
32 /* Deal with vax/tahoe byte order issues */
33 #  ifdef vax
34 #    define	cat3t(a,b,c) cat3(a,b,c)
35 #  else
36 #    define	cat3t(a,b,c) cat3(a,c,b)
37 #  endif
38 
39 #  define vccast(name) (*(const double *)(cat3(name,,x)))
40 
41    /*
42     * Define a constant to high precision on a Vax or Tahoe.
43     *
44     * Args are the name to define, the decimal floating point value,
45     * four 16-bit chunks of the float value in hex
46     * (because the vax and tahoe differ in float format!), the power
47     * of 2 of the hex-float exponent, and the hex-float mantissa.
48     * Most of these arguments are not used at compile time; they are
49     * used in a post-check to make sure the constants were compiled
50     * correctly.
51     *
52     * People who want to use the constant will have to do their own
53     *     #define foo vccast(foo)
54     * since CPP cannot do this for them from inside another macro (sigh).
55     * We define "vccast" if this needs doing.
56     */
57 #  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
58 	const static long cat3(name,,x)[] = {cat3t(0x,x1,x2), cat3t(0x,x3,x4)};
59 
60 #  define ic(name, value, bexp, xval) ;
61 
62 #else	/* vax or tahoe */
63 
64    /* Hooray, we have an IEEE machine */
65 #  undef vccast
66 #  define vc(name, value, x1,x2,x3,x4, bexp, xval) ;
67 
68 #  define ic(name, value, bexp, xval) \
69 	const static double name = value;
70 
71 #endif	/* defined(vax)||defined(tahoe) */
72 
73 
74 /*
75  * Functions internal to the math package, yet not static.
76  */
77 extern double	exp__E();
78 extern double	log__L();
79 
80