external/bsd/pcc/dist/pcc-libs/libpcc/moddi3.c

   1 /*      $Id: moddi3.c,v 1.1.1.2 2009/09/04 00:27:36 gmcgarry Exp $      */
   2 /*      $NetBSD: moddi3.c,v 1.1 2005/12/20 19:28:51 christos Exp $      */
   3
   4 /*-
   5  * Copyright (c) 1992, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This software was developed by the Computer Systems Engineering group
   9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  10  * contributed to Berkeley.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include "quad.h"
  38
  39 /*
  40  * Return remainder after dividing two signed quads.
  41  *
  42  * XXX  we assume a % b < 0 iff a < 0, but this is actually machine-dependent.
  43  */
  44 quad_t
  45 __moddi3(quad_t a, quad_t b)
  46 {
  47         u_quad_t ua, ub, ur;
  48         int neg = 0;
  49
  50         ua = a;
  51         ub = b;
  52
  53         if (a < 0)
  54                 ua = -ua, neg ^= 1;
  55         if (b < 0)
  56                 ub = -ub;
  57         (void)__qdivrem(ua, ub, &ur);
  58         if (neg)
  59                 ur = -ur;
  60         return (ur);
  61 }