quad.h

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/*-
 * 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.
 * 4. 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
 * $BSDSUniX$
 */

#ifndef _LIBKERN_QUAD_H_
#define _LIBKERN_QUAD_H_

/*
 * 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 `long'.
 *
 *  - 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 longs, for instance, or 96-bit arithmetic on machines
 * with 48-bit longs.
 */

#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/limits.h>
#include <sys/syslimits.h>

/*
 * 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 */
        quad_t  uq;             /* as an unsigned quad */
        long    sl[2];          /* as two signed longs */
        u_long  ul[2];          /* as two unsigned longs */
};

/*
 * Define high and low longwords.
 */
#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 LONG_BITS       (sizeof(long) * CHAR_BIT)
#define HALF_BITS       (sizeof(long) * 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_long/2)).  (`x' must actually be u_long.)
 *
 * 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(long)*CHAR_BIT/2).
 */
#define HHALF(x)        ((x) >> HALF_BITS)
#define LHALF(x)        ((x) & ((1 << HALF_BITS) - 1))
#define LHUP(x)         ((x) << HALF_BITS)

typedef unsigned int    qshift_t;

quad_t          __ashldi3(quad_t, qshift_t);
quad_t          __ashrdi3(quad_t, qshift_t);
int             __cmpdi2(quad_t a, quad_t b);
quad_t          __divdi3(quad_t a, quad_t b);
quad_t          __lshrdi3(quad_t, qshift_t);
quad_t          __moddi3(quad_t a, quad_t b);
u_quad_t        __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
u_quad_t        __udivdi3(u_quad_t a, u_quad_t b);
u_quad_t        __umoddi3(u_quad_t a, u_quad_t b);
int             __ucmpdi2(u_quad_t a, u_quad_t b);

#endif /* !_LIBKERN_QUAD_H_ */