216 lines
6.4 KiB
C++
Executable File
216 lines
6.4 KiB
C++
Executable File
/* -*- 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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* Guido Tack <tack@gecode.org>
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* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
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*
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* Copyright:
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* Christian Schulte, 2004
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* Guido Tack, 2006
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* Vincent Barichard, 2012
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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 Float { namespace Arithmetic {
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/*
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* Positive bounds consistent squaring
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*
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*/
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template<class VA, class VB>
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forceinline
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SqrPlus<VA,VB>::SqrPlus(Home home, VA x0, VB x1)
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: MixBinaryPropagator<VA,PC_FLOAT_BND,VB,PC_FLOAT_BND>(home,x0,x1) {}
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template<class VA, class VB>
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forceinline ExecStatus
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SqrPlus<VA,VB>::post(Home home, VA x0, VB x1) {
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if (x0 == x1) {
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if (x0.assigned())
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return ((x0.val() == 0) || (x0.val() == 1))? ES_OK : ES_FAILED;
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} else {
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GECODE_ME_CHECK(x0.eq(home,sqrt(x1.val())));
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GECODE_ME_CHECK(x1.eq(home,sqr(x0.val())));
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}
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(void) new (home) SqrPlus<VA,VB>(home,x0,x1);
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return ES_OK;
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}
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template<class VA, class VB>
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forceinline
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SqrPlus<VA,VB>::SqrPlus(Space& home, SqrPlus<VA,VB>& p)
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: MixBinaryPropagator<VA,PC_FLOAT_BND,VB,PC_FLOAT_BND>(home,p) {}
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template<class VA, class VB>
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Actor*
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SqrPlus<VA,VB>::copy(Space& home) {
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return new (home) SqrPlus<VA,VB>(home,*this);
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}
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template<class VA, class VB>
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ExecStatus
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SqrPlus<VA,VB>::propagate(Space& home, const ModEventDelta&) {
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if (x0 == x1) {
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if (x0.max() < 1) GECODE_ME_CHECK(x0.eq(home,0));
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else if (x0.min() > 0) GECODE_ME_CHECK(x0.eq(home,1));
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if (x0.assigned())
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return ((x0.val() == 0) || (x0.val() == 1))? home.ES_SUBSUMED(*this) : ES_FAILED;
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} else {
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GECODE_ME_CHECK(x0.eq(home,sqrt(x1.val())));
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GECODE_ME_CHECK(x1.eq(home,sqr(x0.val())));
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if (x0.assigned() || x1.assigned()) return home.ES_SUBSUMED(*this);
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}
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return ES_FIX;
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}
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/*
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* Bounds consistent squaring
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*
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*/
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template<class View>
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forceinline
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Sqr<View>::Sqr(Home home, View x0, View x1)
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: BinaryPropagator<View,PC_FLOAT_BND>(home,x0,x1) {}
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template<class View>
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forceinline ExecStatus
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Sqr<View>::post(Home home, View x0, View x1) {
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GECODE_ME_CHECK(x1.gq(home,0));
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if (x0 == x1) {
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if (x0.assigned())
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return ((x0.val() == 0) || (x0.val() == 1))? ES_OK : ES_FAILED;
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GECODE_ME_CHECK(x1.lq(home,1));
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return SqrPlus<FloatView,FloatView>::post(home,x0,x1);
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} else {
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if (x0.min() >= 0)
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return SqrPlus<FloatView,FloatView>::post(home,x0,x1);
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if (x0.max() <= 0)
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return SqrPlus<MinusView,FloatView>::post(home,MinusView(x0),x1);
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GECODE_ME_CHECK(x1.eq(home,sqr(x0.val())));
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(void) new (home) Sqr<View>(home,x0,x1);
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}
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return ES_OK;
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}
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template<class View>
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forceinline
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Sqr<View>::Sqr(Space& home, Sqr<View>& p)
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: BinaryPropagator<View,PC_FLOAT_BND>(home,p) {}
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template<class View>
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Actor*
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Sqr<View>::copy(Space& home) {
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return new (home) Sqr<View>(home,*this);
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}
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template<class View>
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ExecStatus
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Sqr<View>::propagate(Space& home, const ModEventDelta&) {
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assert(x1.min() >= 0);
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if (x0.min() >= 0)
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GECODE_REWRITE(*this,(SqrPlus<FloatView,FloatView>::post(home(*this),x0,x1)));
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if (x0.max() <= 0)
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GECODE_REWRITE(*this,(SqrPlus<MinusView,FloatView>::post(home(*this),
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MinusView(x0),x1)));
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GECODE_ME_CHECK(x1.eq(home,sqr(x0.val())));
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Rounding r;
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FloatVal z = sqrt(x1.val());
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if (x0.min() > -r.sqrt_up(x1.min()))
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GECODE_ME_CHECK(x0.eq(home,z));
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else if (x0.max() < r.sqrt_down(x1.min()))
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GECODE_ME_CHECK(x0.eq(home,-z));
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else
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GECODE_ME_CHECK(x0.eq(home,hull(z,-z)));
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return ES_NOFIX;
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}
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/*
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* Bounds consistent square root operator
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*
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*/
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template<class A, class B>
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forceinline
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Sqrt<A,B>::Sqrt(Home home, A x0, B x1)
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: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
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template<class A, class B>
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ExecStatus
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Sqrt<A,B>::post(Home home, A x0, B x1) {
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GECODE_ME_CHECK(x0.gq(home,0));
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if (x0 == x1) {
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if (x0.assigned())
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return ((x0.val() == 0) || (x0.val() == 1))? ES_OK : ES_FAILED;
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GECODE_ME_CHECK(x0.lq(home,1));
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(void) new (home) Sqrt<A,B>(home,x0,x1);
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} else {
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GECODE_ME_CHECK(x1.eq(home,sqrt(x0.val())));
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(void) new (home) Sqrt<A,B>(home,x0,x1);
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}
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return ES_OK;
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}
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template<class A, class B>
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forceinline
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Sqrt<A,B>::Sqrt(Space& home, Sqrt<A,B>& p)
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: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,p) {}
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template<class A, class B>
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Actor*
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Sqrt<A,B>::copy(Space& home) {
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return new (home) Sqrt<A,B>(home,*this);
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}
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template<class A, class B>
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ExecStatus
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Sqrt<A,B>::propagate(Space& home, const ModEventDelta&) {
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if (x0 == x1) {
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if (x0.max() < 1) GECODE_ME_CHECK(x0.eq(home,0));
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else if (x0.min() > 0) GECODE_ME_CHECK(x0.eq(home,1));
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if (x0.assigned())
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return ((x0.val() == 0) || (x0.val() == 1))? home.ES_SUBSUMED(*this) : ES_FAILED;
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} else {
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GECODE_ME_CHECK(x0.eq(home,sqr(x1.val())));
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GECODE_ME_CHECK(x1.eq(home,sqrt(x0.val())));
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if (x0.assigned() || x1.assigned()) return home.ES_SUBSUMED(*this);
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}
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return ES_FIX;
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}
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}}}
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// STATISTICS: float-prop
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