FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/quad.h

     /*      $NetBSD: quad.h,v 1.16 2003/08/07 16:32:10 agc Exp $    */
     
     /*-
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This software was developed by the Computer Systems Engineering group
      * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      * contributed to Berkeley.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)quad.h      8.1 (Berkeley) 6/4/93
     */
    
    /*
     * Quad arithmetic.
     *
     * This library makes the following assumptions:
     *
     *  - The type long long (aka quad_t) exists.
     *
     *  - A quad variable is exactly twice as long as `int'.
     *
     *  - The machine's arithmetic is two's complement.
     *
     * This library can provide 128-bit arithmetic on a machine with 128-bit
     * quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
     * with 48-bit ints.
     */
    
    #include <sys/types.h>
    #if !defined(_KERNEL) && !defined(_STANDALONE)
    #include <limits.h>
    #else
    #include <machine/limits.h>
    #endif
    
    /*
     * Depending on the desired operation, we view a `long long' (aka quad_t) in
     * one or more of the following formats.
     */
    union uu {
            quad_t  q;              /* as a (signed) quad */
            u_quad_t uq;            /* as an unsigned quad */
            int     sl[2];          /* as two signed ints */
            u_int   ul[2];          /* as two unsigned ints */
    };
    
    /*
     * Define high and low parts of a quad_t.
     */
    #define H               _QUAD_HIGHWORD
    #define L               _QUAD_LOWWORD
    
    /*
     * Total number of bits in a quad_t and in the pieces that make it up.
     * These are used for shifting, and also below for halfword extraction
     * and assembly.
     */
    #define QUAD_BITS       (sizeof(quad_t) * CHAR_BIT)
    #define INT_BITS        (sizeof(int) * CHAR_BIT)
    #define HALF_BITS       (sizeof(int) * CHAR_BIT / 2)
    
    /*
     * Extract high and low shortwords from longword, and move low shortword of
     * longword to upper half of long, i.e., produce the upper longword of
     * ((quad_t)(x) << (number_of_bits_in_int/2)).  (`x' must actually be u_int.)
     *
     * These are used in the multiply code, to split a longword into upper
     * and lower halves, and to reassemble a product as a quad_t, shifted left
     * (sizeof(int)*CHAR_BIT/2).
     */
    #define HHALF(x)        ((u_int)(x) >> HALF_BITS)
    #define LHALF(x)        ((u_int)(x) & (((int)1 << HALF_BITS) - 1))
    #define LHUP(x)         ((u_int)(x) << HALF_BITS)
    
   /*
    * XXX
    * Compensate for gcc 1 vs gcc 2.  Gcc 1 defines ?sh?di3's second argument
    * as u_quad_t, while gcc 2 correctly uses int.  Unfortunately, we still use
    * both compilers.
    */
   #if __GNUC_PREREQ__(2, 0) || defined(lint)
   typedef unsigned int    qshift_t;
   #else
   typedef u_quad_t        qshift_t;
   #endif
   
   __BEGIN_DECLS
   quad_t __adddi3 __P((quad_t, quad_t));
   quad_t __anddi3 __P((quad_t, quad_t));
   quad_t __ashldi3 __P((quad_t, qshift_t));
   quad_t __ashrdi3 __P((quad_t, qshift_t));
   int __cmpdi2 __P((quad_t, quad_t ));
   quad_t __divdi3 __P((quad_t, quad_t));
   quad_t __fixdfdi __P((double));
   quad_t __fixsfdi __P((float));
   u_quad_t __fixunsdfdi __P((double));
   u_quad_t __fixunssfdi __P((float));
   double __floatdidf __P((quad_t));
   float __floatdisf __P((quad_t));
   double __floatunsdidf __P((u_quad_t));
   quad_t __iordi3 __P((quad_t, quad_t));
   quad_t __lshldi3 __P((quad_t, qshift_t));
   quad_t __lshrdi3 __P((quad_t, qshift_t));
   quad_t __moddi3 __P((quad_t, quad_t));
   quad_t __muldi3 __P((quad_t, quad_t));
   quad_t __negdi2 __P((quad_t));
   quad_t __one_cmpldi2 __P((quad_t));
   u_quad_t __qdivrem __P((u_quad_t, u_quad_t, u_quad_t *));
   quad_t __subdi3 __P((quad_t, quad_t));
   int __ucmpdi2 __P((u_quad_t, u_quad_t));
   u_quad_t __udivdi3 __P((u_quad_t, u_quad_t ));
   u_quad_t __umoddi3 __P((u_quad_t, u_quad_t ));
   quad_t __xordi3 __P((quad_t, quad_t));
   __END_DECLS

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