/usr/include/linbox/matrix/abnormal-helpers.h is in liblinbox-dev 1.4.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | /* Copyright (C) 2013 LinBox
* Written by AJS <stachnik@udel.edu>
*
*
*
* ========LICENCE========
* This file is part of the library LinBox.
*
* LinBox is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*/
/*! @file linbox/matrix/abnormal-helpers.h
* @ingroup linbox/matrix
* @brief
*/
#ifndef __LINBOX_ABNORMAL_HELPERS_H
#define __LINBOX_ABNORMAL_HELPERS_H
#include <stdlib.h>
#include <fstream>
namespace LinBox
{
template <class Field>
class AbnormalHelper {
public:
typedef typename Field::Element Element;
typedef typename Field::Element Abnormal;
AbnormalHelper () {}
AbnormalHelper(const Field& F) : field_(&F) {}
void init(const Field& field) { field_=&field; }
inline Abnormal& mulacc(Abnormal& x, const Element& y, const Element& z) const {
field_->mulacc(x,y,z);
return x;
}
inline Element normalize(Abnormal& elt) const {
Element d;
field_->init(d,elt);
return d;
}
protected:
Field* field_;
};
template <>
class AbnormalHelper<Givaro::Modular<double> > {
public:
typedef Givaro::Modular<double> Field;
typedef double Element;
typedef double Abnormal;
AbnormalHelper () {}
AbnormalHelper(const Field& field) {init(field);}
void init(const Field& field) {
modulus_=(double)field.characteristic();
unsigned long long maxDouble = 1ULL<<52;
bound_=(double)maxDouble;
field_=&field;
}
inline Abnormal& mulacc(Abnormal& x, const Element& y, const Element& z) const
{
Element d;
d=y*z;//at most (2**26-1)**2
x=x+d;//at most (2**26-1)**2+(2**52-1)<2**53
maybeNormalize(x);
return x;
}
inline Element& normalize(Abnormal& elt) const
{
return elt=fmod(elt,modulus_);
}
protected:
inline Abnormal& maybeNormalize(Abnormal& elt) const
{
if (elt>=bound_) {
elt=fmod(elt,modulus_);
}
return elt;
}
double modulus_;
double bound_;
const Field* field_;
};
template <>
class AbnormalHelper<Givaro::Modular<uint64_t> > {
public:
typedef Givaro::Modular<uint64_t> Field;
typedef uint64_t Element;
typedef uint64_t Abnormal;
AbnormalHelper () {}
AbnormalHelper(const Field& field) {init(field);}
void init(const Field& field) {
modulus_=field.characteristic();
bound_=(uint64_t)(1ULL<<62);
field_=&field;
}
inline Abnormal& mulacc(Abnormal& x, const Element& y, const Element& z) const
{
Abnormal d;
d=y*z;
x=x+d;
maybeNormalize(x);
return x;
}
inline Element normalize(Abnormal& elt) const
{
return elt=elt%modulus_;
}
protected:
inline Abnormal& maybeNormalize(Abnormal& elt) const
{
if (elt>=bound_) {
elt=elt%modulus_;
}
return elt;
}
Abnormal modulus_;
Abnormal bound_;
const Field* field_;
};
}
#endif // __LINBOX_ABNORMAL_HELPERS_H
// Local Variables:
// mode: C++
// tab-width: 8
// indent-tabs-mode: nil
// c-basic-offset: 8
// End:
// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
|