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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2013
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 *
32 */
33
34namespace Gecode { namespace Int {
35
36 template<class IntType>
37 forceinline IntType
38 ceil_div_pp(IntType x, IntType y) {
39 assert((x >= 0) && (y >= 0));
40 /*
41 * This is smarter than it looks: for many cpus, % and / are
42 * implemented by the same instruction and an optimizing compiler
43 * will generate the instruction only once.
44 */
45 return ((x % y) == 0) ? x/y : (x/y + 1);
46 }
47 template<class IntType>
48 forceinline IntType
49 floor_div_pp(IntType x, IntType y) {
50 assert((x >= 0) && (y >= 0));
51 return x / y;
52 }
53
54 template<class IntType>
55 forceinline IntType
56 ceil_div_px(IntType x, IntType y) {
57 assert(x >= 0);
58 return (y >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(x,-y);
59 }
60 template<class IntType>
61 forceinline IntType
62 floor_div_px(IntType x, IntType y) {
63 assert(x >= 0);
64 return (y >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(x,-y);
65 }
66
67 template<class IntType>
68 forceinline IntType
69 ceil_div_xp(IntType x, IntType y) {
70 assert(y >= 0);
71 return (x >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(-x,y);
72 }
73 template<class IntType>
74 forceinline IntType
75 floor_div_xp(IntType x, IntType y) {
76 assert(y >= 0);
77 return (x >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(-x,y);
78 }
79
80 template<class IntType>
81 forceinline IntType
82 ceil_div_xx(IntType x, IntType y) {
83 return (x >= 0) ? ceil_div_px(x,y) : -floor_div_px(-x,y);
84 }
85 template<class IntType>
86 forceinline IntType
87 floor_div_xx(IntType x, IntType y) {
88 return (x >= 0) ? floor_div_px(x,y) : -ceil_div_px(-x,y);
89 }
90
91}}
92
93// STATISTICS: int-prop
94