lib/libstand/quad.h

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This software was developed by the Computer Systems Engineering group
   6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   7  * contributed to Berkeley.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)quad.h      8.1 (Berkeley) 6/4/93
  34  * $FreeBSD: src/lib/libstand/quad.h,v 1.2 1999/08/28 00:05:33 peter Exp $
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #include <sys/types.h>
  39 #include <limits.h>
  40
  41 _Static_assert(sizeof(quad_t) == sizeof(int) * 2,
  42         "Bitwise function in libstand are broken on this architecture");
  43
  44 /*
  45  * Depending on the desired operation, we view a `long long' (aka quad_t) in
  46  * one or more of the following formats.
  47  */
  48 union uu {
  49         quad_t  q;              /* as a (signed) quad */
  50         quad_t  uq;             /* as an unsigned quad */
  51         int     sl[2];          /* as two signed ints */
  52         u_int   ul[2];          /* as two unsigned ints */
  53 };
  54
  55 /*
  56  * Define high and low longwords.
  57  */
  58 #define H               _QUAD_HIGHWORD
  59 #define L               _QUAD_LOWWORD
  60
  61 #define HALF_BITS       (sizeof(int) * CHAR_BIT / 2)
  62
  63 #define HHALF(x)        ((x) >> HALF_BITS)
  64 #define LHALF(x)        ((x) & ((1 << HALF_BITS) - 1))
  65
  66 u_quad_t        __qdivrem (u_quad_t, u_quad_t, u_quad_t *);
  67 u_quad_t        __udivdi3 (u_quad_t, u_quad_t);
  68 u_quad_t        __umoddi3 (u_quad_t, u_quad_t);