common/lib/libc/quad/quad.h

   1 /*      $NetBSD: quad.h,v 1.7 2012/08/06 02:31:54 matt Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This software was developed by the Computer Systems Engineering group
   8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   9  * contributed to Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)quad.h      8.1 (Berkeley) 6/4/93
  36  */
  37
  38 /*
  39  * Quad arithmetic.
  40  *
  41  * This library makes the following assumptions:
  42  *
  43  *  - The type long long (aka quad_t) exists.
  44  *
  45  *  - A quad variable is exactly twice as long as `int'.
  46  *
  47  *  - The machine's arithmetic is two's complement.
  48  *
  49  * This library can provide 128-bit arithmetic on a machine with 128-bit
  50  * quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
  51  * with 48-bit ints.
  52  */
  53
  54 #include <sys/types.h>
  55 #if !defined(_KERNEL) && !defined(_STANDALONE)
  56 #include <limits.h>
  57 #else
  58 #include <machine/limits.h>
  59 #endif
  60
  61 #if defined(__ARM_EABI__) && !defined(lint)
  62 #define ARM_EABI_ALIAS(alias,sym)       __strong_alias(alias,sym);
  63 #else
  64 #define ARM_EABI_ALIAS(alias,sym)       /* nothing */
  65 #endif
  66
  67 /*
  68  * Depending on the desired operation, we view a `long long' (aka quad_t) in
  69  * one or more of the following formats.
  70  */
  71 union uu {
  72         quad_t  q;              /* as a (signed) quad */
  73         u_quad_t uq;            /* as an unsigned quad */
  74         int     sl[2];          /* as two signed ints */
  75         u_int   ul[2];          /* as two unsigned ints */
  76 };
  77
  78 /*
  79  * Define high and low parts of a quad_t.
  80  */
  81 #define H               _QUAD_HIGHWORD
  82 #define L               _QUAD_LOWWORD
  83
  84 /*
  85  * Total number of bits in a quad_t and in the pieces that make it up.
  86  * These are used for shifting, and also below for halfword extraction
  87  * and assembly.
  88  */
  89 #define QUAD_BITS       (sizeof(quad_t) * CHAR_BIT)
  90 #define INT_BITS        (sizeof(int) * CHAR_BIT)
  91 #define HALF_BITS       (sizeof(int) * CHAR_BIT / 2)
  92
  93 /*
  94  * Extract high and low shortwords from longword, and move low shortword of
  95  * longword to upper half of long, i.e., produce the upper longword of
  96  * ((quad_t)(x) << (number_of_bits_in_int/2)).  (`x' must actually be u_int.)
  97  *
  98  * These are used in the multiply code, to split a longword into upper
  99  * and lower halves, and to reassemble a product as a quad_t, shifted left
 100  * (sizeof(int)*CHAR_BIT/2).
 101  */
 102 #define HHALF(x)        ((u_int)(x) >> HALF_BITS)
 103 #define LHALF(x)        ((u_int)(x) & (((int)1 << (u_int)HALF_BITS) - 1))
 104 #define LHUP(x)         ((u_int)(x) << (u_int)HALF_BITS)
 105
 106 /*
 107  * XXX
 108  * Compensate for gcc 1 vs gcc 2.  Gcc 1 defines ?sh?di3's second argument
 109  * as u_quad_t, while gcc 2 correctly uses int.  Unfortunately, we still use
 110  * both compilers.
 111  */
 112 #if __GNUC_PREREQ__(2, 0) || defined(lint)
 113 typedef unsigned int    qshift_t;
 114 #else
 115 typedef u_quad_t        qshift_t;
 116 #endif
 117
 118 __BEGIN_DECLS
 119 quad_t __adddi3(quad_t, quad_t);
 120 quad_t __anddi3(quad_t, quad_t);
 121 quad_t __ashldi3(quad_t, qshift_t);
 122 quad_t __ashrdi3(quad_t, qshift_t);
 123 int __cmpdi2(quad_t, quad_t);
 124 quad_t __divdi3(quad_t, quad_t);
 125 quad_t __fixtfdi(long double);
 126 quad_t __fixdfdi(double);
 127 quad_t __fixsfdi(float);
 128 u_quad_t __fixunstfdi(long double);
 129 u_quad_t __fixunsdfdi(double);
 130 u_quad_t __fixunssfdi(float);
 131 long double __floatditf(quad_t);
 132 double __floatdidf(quad_t);
 133 float __floatdisf(quad_t);
 134 long double __floatunditf(u_quad_t);
 135 double __floatundidf(u_quad_t);
 136 float __floatundisf(u_quad_t);
 137 quad_t __iordi3(quad_t, quad_t);
 138 quad_t __lshldi3(quad_t, qshift_t);
 139 quad_t __lshrdi3(quad_t, qshift_t);
 140 quad_t __moddi3(quad_t, quad_t);
 141 quad_t __muldi3(quad_t, quad_t);
 142 quad_t __negdi2(quad_t);
 143 quad_t __one_cmpldi2(quad_t);
 144 u_quad_t __qdivrem(u_quad_t, u_quad_t, u_quad_t *);
 145 quad_t __subdi3(quad_t, quad_t);
 146 int __ucmpdi2(u_quad_t, u_quad_t);
 147 u_quad_t __udivdi3(u_quad_t, u_quad_t );
 148 u_quad_t __umoddi3(u_quad_t, u_quad_t );
 149 quad_t __xordi3(quad_t, quad_t);
 150 __END_DECLS