Jip J. Dekker
3e72b0e857
git-subtree-dir: software/gecode_on_record git-subtree-split: 37ed9bda495ea87e63217c19a374b5a93bb0078e
95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2013
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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namespace Gecode { namespace Int {
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template<class IntType>
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forceinline IntType
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ceil_div_pp(IntType x, IntType y) {
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assert((x >= 0) && (y >= 0));
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/*
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* This is smarter than it looks: for many cpus, % and / are
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* implemented by the same instruction and an optimizing compiler
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* will generate the instruction only once.
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*/
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return ((x % y) == 0) ? x/y : (x/y + 1);
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}
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template<class IntType>
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forceinline IntType
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floor_div_pp(IntType x, IntType y) {
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assert((x >= 0) && (y >= 0));
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return x / y;
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}
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template<class IntType>
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forceinline IntType
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ceil_div_px(IntType x, IntType y) {
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assert(x >= 0);
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return (y >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(x,-y);
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}
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template<class IntType>
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forceinline IntType
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floor_div_px(IntType x, IntType y) {
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assert(x >= 0);
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return (y >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(x,-y);
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}
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template<class IntType>
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forceinline IntType
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ceil_div_xp(IntType x, IntType y) {
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assert(y >= 0);
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return (x >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(-x,y);
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}
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template<class IntType>
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forceinline IntType
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floor_div_xp(IntType x, IntType y) {
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assert(y >= 0);
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return (x >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(-x,y);
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}
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template<class IntType>
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forceinline IntType
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ceil_div_xx(IntType x, IntType y) {
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return (x >= 0) ? ceil_div_px(x,y) : -floor_div_px(-x,y);
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}
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template<class IntType>
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forceinline IntType
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floor_div_xx(IntType x, IntType y) {
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return (x >= 0) ? floor_div_px(x,y) : -ceil_div_px(-x,y);
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}
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}}
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// STATISTICS: int-prop
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