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* these are dependencies for gcc 4 Graphite engine build. * CLooG 0.18.0 includes ISL 0.11.1 which is the backend that the build script enables. * PPL is needed by GCC build even if it isn't the chosen backend.
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/* Random_Number_Generator class implementation: inline functions.
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Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
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Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
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This file is part of the Parma Polyhedra Library (PPL).
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The PPL is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The PPL is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
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For the most up-to-date information see the Parma Polyhedra Library
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site: http://www.cs.unipr.it/ppl/ . */
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#ifndef PPL_Random_Number_Generator_inlines_hh
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#define PPL_Random_Number_Generator_inlines_hh 1
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#include <ctime>
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namespace Parma_Polyhedra_Library {
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namespace Implementation {
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namespace Random_Numbers {
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template <typename T>
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class Random_Number_Generator_Aux {
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public:
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Random_Number_Generator_Aux(unsigned int max_bits) {
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if (std::numeric_limits<T>::is_bounded) {
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assign_r(zmin, std::numeric_limits<T>::min(), ROUND_NOT_NEEDED);
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assign_r(zrange, std::numeric_limits<T>::max(), ROUND_NOT_NEEDED);
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zrange -= zmin;
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++zrange;
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}
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else if (std::numeric_limits<T>::is_signed) {
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zmin = 1;
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zmin <<= (max_bits - 1);
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zmin = -zmin;
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}
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else {
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assign_r(zmin, std::numeric_limits<T>::min(), ROUND_NOT_NEEDED);
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}
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}
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mpz_class zmin;
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mpz_class zrange;
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};
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} // namespace Random_Numbers
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} // namespace Implementation
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inline
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Random_Number_Generator::Random_Number_Generator()
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: rand(gmp_randinit_default), max_bits(512) {
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// Seed the random number generator with the current time.
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rand.seed((unsigned long) time(0));
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}
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inline
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Random_Number_Generator::Random_Number_Generator(const unsigned long seed)
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: rand(gmp_randinit_default), max_bits(512) {
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// Seed the random number generator with the given value.
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rand.seed(seed);
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}
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template <typename T>
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inline void
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Random_Number_Generator::get(T& x, unsigned int info) {
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using Implementation::Random_Numbers::Random_Number_Generator_Aux;
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used(info);
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static Random_Number_Generator_Aux<T> aux(max_bits);
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mpz_class n;
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if (std::numeric_limits<T>::is_bounded) {
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n = rand.get_z_range(aux.zrange);
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}
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else {
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n = rand.get_z_bits(max_bits);
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}
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n += aux.zmin;
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assign_r(x, n, ROUND_NOT_NEEDED);
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}
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} // namespace Parma_Polyhedra_Library
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#endif // !defined(PPL_Random_Number_Generator_inlines_hh)
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