random.cc (8658:f1a69b7246f7) | random.cc (10349:939094c17866) |
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1/* | 1/* |
2 * Copyright (c) 2014 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * |
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2 * Copyright (c) 2003-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright --- 12 unchanged lines hidden (view full) --- 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 * Ali Saidi | 14 * Copyright (c) 2003-2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright --- 12 unchanged lines hidden (view full) --- 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Nathan Binkert 41 * Ali Saidi |
42 * Andreas Hansson |
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30 */ 31 | 43 */ 44 |
32#include <limits> 33#include "base/fenv.hh" 34#include "base/intmath.hh" | 45#include <sstream> 46 |
35#include "base/misc.hh" 36#include "base/random.hh" 37#include "sim/serialize.hh" 38 | 47#include "base/misc.hh" 48#include "base/random.hh" 49#include "sim/serialize.hh" 50 |
39using namespace std; 40 | |
41Random::Random() 42{ | 51Random::Random() 52{ |
43 // default random seed taken from original source | 53 // default random seed |
44 init(5489); 45} 46 47Random::Random(uint32_t s) 48{ 49 init(s); 50} 51 | 54 init(5489); 55} 56 57Random::Random(uint32_t s) 58{ 59 init(s); 60} 61 |
52Random::Random(uint32_t init_key[], int key_length) 53{ 54 init(init_key, key_length); 55} 56 | |
57Random::~Random() 58{ 59} 60 | 62Random::~Random() 63{ 64} 65 |
61// To preserve the uniform random distribution between min and max, 62// and allow all numbers to be represented, we generate a uniform 63// random number to the nearest power of two greater than max. If 64// this number doesn't fall between 0 and max, we try again. Anything 65// else would skew the distribution. 66uint32_t 67Random::genrand(uint32_t max) | 66void 67Random::init(uint32_t s) |
68{ | 68{ |
69 if (max == 0) 70 return 0; 71 if (max == std::numeric_limits<uint32_t>::max()) 72 return genrand(); 73 74 int log = ceilLog2(max + 1); 75 int shift = (sizeof(uint32_t) * 8 - log); 76 uint32_t random; 77 78 do { 79 random = genrand() >> shift; 80 } while (random > max); 81 82 return random; | 69 gen.seed(s); |
83} 84 | 70} 71 |
85uint64_t 86Random::genrand(uint64_t max) | 72void 73Random::serialize(std::ostream &os) |
87{ | 74{ |
88 if (max == 0) 89 return 0; 90 if (max == std::numeric_limits<uint64_t>::max()) 91 return genrand(); | 75 panic("Currently not used anywhere.\n"); |
92 | 76 |
93 int log = ceilLog2(max + 1); 94 int shift = (sizeof(uint64_t) * 8 - log); 95 uint64_t random; 96 97 do { 98 random = (uint64_t)genrand() << 32 | (uint64_t)genrand(); 99 random = random >> shift; 100 } while (random > max); 101 102 return random; | 77 // get the state from the generator 78 std::ostringstream oss; 79 oss << gen; 80 std::string state = oss.str(); 81 paramOut(os, "mt_state", state); |
103} 104 105void | 82} 83 84void |
106Random::serialize(const string &base, ostream &os) | 85Random::unserialize(Checkpoint *cp, const std::string §ion) |
107{ | 86{ |
108 int length = N; 109 paramOut(os, base + ".mti", mti); 110 paramOut(os, base + ".length", length); 111 arrayParamOut(os, base + ".data", mt, length); 112} | 87 panic("Currently not used anywhere.\n"); |
113 | 88 |
114void 115Random::unserialize(const string &base, Checkpoint *cp, const string §ion) 116{ 117 int length; 118 119 paramIn(cp, section, base + ".mti", mti); 120 paramIn(cp, section, base + ".length", length); 121 if (length != N) 122 panic("cant unserialize random number data. length != %d\n", length); 123 124 arrayParamIn(cp, section, base + ".data", mt, length); | 89 // the random generator state did not use to be part of the 90 // checkpoint state, so be forgiving in the unserialization and 91 // keep on going if the parameter is not there 92 std::string state; 93 if (optParamIn(cp, section, "mt_state", state)) { 94 std::istringstream iss(state); 95 iss >> gen; 96 } |
125} 126 127Random random_mt; | 97} 98 99Random random_mt; |