Annotation of sys/lib/libkern/divdi3.c, Revision 1.1.1.1
1.1 nbrk 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:
34: #if defined(LIBC_SCCS) && !defined(lint)
35: static char rcsid[] = "$OpenBSD: divdi3.c,v 1.5 2004/11/28 07:23:41 mickey Exp $";
36: #endif /* LIBC_SCCS and not lint */
37:
38: #include "quad.h"
39:
40: /*
41: * Divide two signed quads.
42: * ??? if -1/2 should produce -1 on this machine, this code is wrong
43: */
44: quad_t
45: __divdi3(quad_t a, quad_t b)
46: {
47: u_quad_t ua, ub, uq;
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, neg ^= 1;
57:
58: uq = __qdivrem(ua, ub, (u_quad_t *)0);
59: if (neg)
60: uq = - uq;
61: return uq;
62: }
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