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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- *//* * Main authors: * Christian Schulte <schulte@gecode.org> * Guido Tack <tack@gecode.org> * Vincent Barichard <Vincent.Barichard@univ-angers.fr> * * Copyright: * Christian Schulte, 2004 * Guido Tack, 2006 * Vincent Barichard, 2012 * * This file is part of Gecode, the generic constraint * development environment: * http://www.gecode.org * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */
namespace Gecode { namespace Float { namespace Arithmetic {
/* * Positive bounds consistent squaring * */ template<class VA, class VB> forceinline SqrPlus<VA,VB>::SqrPlus(Home home, VA x0, VB x1) : MixBinaryPropagator<VA,PC_FLOAT_BND,VB,PC_FLOAT_BND>(home,x0,x1) {}
template<class VA, class VB> forceinline ExecStatus SqrPlus<VA,VB>::post(Home home, VA x0, VB x1) { if (x0 == x1) { if (x0.assigned()) return ((x0.val() == 0) || (x0.val() == 1))? ES_OK : ES_FAILED; } else { GECODE_ME_CHECK(x0.eq(home,sqrt(x1.val()))); GECODE_ME_CHECK(x1.eq(home,sqr(x0.val()))); }
(void) new (home) SqrPlus<VA,VB>(home,x0,x1); return ES_OK; }
template<class VA, class VB> forceinline SqrPlus<VA,VB>::SqrPlus(Space& home, SqrPlus<VA,VB>& p) : MixBinaryPropagator<VA,PC_FLOAT_BND,VB,PC_FLOAT_BND>(home,p) {}
template<class VA, class VB> Actor* SqrPlus<VA,VB>::copy(Space& home) { return new (home) SqrPlus<VA,VB>(home,*this); }
template<class VA, class VB> ExecStatus SqrPlus<VA,VB>::propagate(Space& home, const ModEventDelta&) { if (x0 == x1) { if (x0.max() < 1) GECODE_ME_CHECK(x0.eq(home,0)); else if (x0.min() > 0) GECODE_ME_CHECK(x0.eq(home,1)); if (x0.assigned()) return ((x0.val() == 0) || (x0.val() == 1))? home.ES_SUBSUMED(*this) : ES_FAILED; } else { GECODE_ME_CHECK(x0.eq(home,sqrt(x1.val()))); GECODE_ME_CHECK(x1.eq(home,sqr(x0.val()))); if (x0.assigned() || x1.assigned()) return home.ES_SUBSUMED(*this); }
return ES_FIX; }
/* * Bounds consistent squaring * */
template<class View> forceinline Sqr<View>::Sqr(Home home, View x0, View x1) : BinaryPropagator<View,PC_FLOAT_BND>(home,x0,x1) {}
template<class View> forceinline ExecStatus Sqr<View>::post(Home home, View x0, View x1) { GECODE_ME_CHECK(x1.gq(home,0)); if (x0 == x1) { if (x0.assigned()) return ((x0.val() == 0) || (x0.val() == 1))? ES_OK : ES_FAILED; GECODE_ME_CHECK(x1.lq(home,1)); return SqrPlus<FloatView,FloatView>::post(home,x0,x1); } else { if (x0.min() >= 0) return SqrPlus<FloatView,FloatView>::post(home,x0,x1); if (x0.max() <= 0) return SqrPlus<MinusView,FloatView>::post(home,MinusView(x0),x1); GECODE_ME_CHECK(x1.eq(home,sqr(x0.val()))); (void) new (home) Sqr<View>(home,x0,x1); } return ES_OK; }
template<class View> forceinline Sqr<View>::Sqr(Space& home, Sqr<View>& p) : BinaryPropagator<View,PC_FLOAT_BND>(home,p) {}
template<class View> Actor* Sqr<View>::copy(Space& home) { return new (home) Sqr<View>(home,*this); }
template<class View> ExecStatus Sqr<View>::propagate(Space& home, const ModEventDelta&) { assert(x1.min() >= 0); if (x0.min() >= 0) GECODE_REWRITE(*this,(SqrPlus<FloatView,FloatView>::post(home(*this),x0,x1))); if (x0.max() <= 0) GECODE_REWRITE(*this,(SqrPlus<MinusView,FloatView>::post(home(*this), MinusView(x0),x1)));
GECODE_ME_CHECK(x1.eq(home,sqr(x0.val()))); Rounding r; FloatVal z = sqrt(x1.val()); if (x0.min() > -r.sqrt_up(x1.min())) GECODE_ME_CHECK(x0.eq(home,z)); else if (x0.max() < r.sqrt_down(x1.min())) GECODE_ME_CHECK(x0.eq(home,-z)); else GECODE_ME_CHECK(x0.eq(home,hull(z,-z)));
return ES_NOFIX; }
/* * Bounds consistent square root operator * */
template<class A, class B> forceinline Sqrt<A,B>::Sqrt(Home home, A x0, B x1) : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
template<class A, class B> ExecStatus Sqrt<A,B>::post(Home home, A x0, B x1) { GECODE_ME_CHECK(x0.gq(home,0)); if (x0 == x1) { if (x0.assigned()) return ((x0.val() == 0) || (x0.val() == 1))? ES_OK : ES_FAILED; GECODE_ME_CHECK(x0.lq(home,1)); (void) new (home) Sqrt<A,B>(home,x0,x1); } else { GECODE_ME_CHECK(x1.eq(home,sqrt(x0.val()))); (void) new (home) Sqrt<A,B>(home,x0,x1); } return ES_OK; }
template<class A, class B> forceinline Sqrt<A,B>::Sqrt(Space& home, Sqrt<A,B>& p) : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,p) {}
template<class A, class B> Actor* Sqrt<A,B>::copy(Space& home) { return new (home) Sqrt<A,B>(home,*this); }
template<class A, class B> ExecStatus Sqrt<A,B>::propagate(Space& home, const ModEventDelta&) { if (x0 == x1) { if (x0.max() < 1) GECODE_ME_CHECK(x0.eq(home,0)); else if (x0.min() > 0) GECODE_ME_CHECK(x0.eq(home,1)); if (x0.assigned()) return ((x0.val() == 0) || (x0.val() == 1))? home.ES_SUBSUMED(*this) : ES_FAILED; } else { GECODE_ME_CHECK(x0.eq(home,sqr(x1.val()))); GECODE_ME_CHECK(x1.eq(home,sqrt(x0.val()))); if (x0.assigned() || x1.assigned()) return home.ES_SUBSUMED(*this); }
return ES_FIX; }
}}}
// STATISTICS: float-prop