lib/libm/noieee_src/mathimpl.h

   1 /*      $NetBSD: mathimpl.h,v 1.10 2011/11/02 02:34:56 christos 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. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      @(#)mathimpl.h  8.1 (Berkeley) 6/4/93
  31  */
  32 #ifndef _NOIEEE_SRC_MATHIMPL_H_
  33 #define _NOIEEE_SRC_MATHIMPL_H_
  34
  35 #include <sys/cdefs.h>
  36 #include <math.h>
  37 #include <stdint.h>
  38
  39 #if defined(__vax__) || defined(tahoe)
  40
  41 /* Deal with different ways to concatenate in cpp */
  42 #define cat3(a,b,c)     a ## b ## c
  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) (cat3(__,name,x).d)
  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 #ifdef _LIBM_DECLARE
  70 #  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
  71     const union { uint32_t l[2]; double d; } cat3(__,name,x) = { \
  72         .l = { [0] = cat3t(0x,x1,x2), [1] = cat3t(0x,x3,x4) } };
  73 #elif defined(_LIBM_STATIC)
  74 #  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
  75     static const union { uint32_t l[2]; double d; } cat3(__,name,x) = { \
  76         .l = { [0] = cat3t(0x,x1,x2), [1] = cat3t(0x,x3,x4) } };
  77 #else
  78 #  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
  79         extern const union { uint32_t l[2]; double d; } cat3(__,name,x);
  80 #endif
  81 #  define ic(name, value, bexp, xval)
  82
  83 #else   /* __vax__ or tahoe */
  84
  85    /* Hooray, we have an IEEE machine */
  86 #  undef vccast
  87 #  define vc(name, value, x1,x2,x3,x4, bexp, xval)
  88
  89 #ifdef _LIBM_DECLARE
  90 #  define ic(name, value, bexp, xval) \
  91         const double __CONCAT(__,name) = value;
  92 #elif _LIBM_STATIC
  93 #  define ic(name, value, bexp, xval) \
  94         static const double __CONCAT(__,name) = value;
  95 #else
  96 #  define ic(name, value, bexp, xval) \
  97         extern const double __CONCAT(__,name);
  98 #endif
  99
 100 #endif  /* defined(__vax__)||defined(tahoe) */
 101
 102 #ifdef __vax__
 103 #include <machine/float.h>
 104 #define _TINY   DBL_EPSILON
 105 #define _TINYER DBL_EPSILON
 106 #define _HUGE   DBL_MAX
 107 #else
 108 #define _TINY   1e-300
 109 #define _TINYER 1e-308
 110 #define _HUGE   1e+300
 111 #endif
 112
 113
 114 /*
 115  * Functions internal to the math package, yet not static.
 116  */
 117 extern double   __exp__E(double, double);
 118 extern double   __log__L(double);
 119 extern int      infnan(int);
 120
 121 struct Double {double a, b;};
 122 double __exp__D(double, double);
 123 struct Double __log__D(double);
 124
 125 #endif /* _NOIEEE_SRC_MATHIMPL_H_ */