random.cc revision 2665
12SN/A/* 21762SN/A * Copyright (c) 2003-2005 The Regents of The University of Michigan 32SN/A * All rights reserved. 42SN/A * 52SN/A * Redistribution and use in source and binary forms, with or without 62SN/A * modification, are permitted provided that the following conditions are 72SN/A * met: redistributions of source code must retain the above copyright 82SN/A * notice, this list of conditions and the following disclaimer; 92SN/A * redistributions in binary form must reproduce the above copyright 102SN/A * notice, this list of conditions and the following disclaimer in the 112SN/A * documentation and/or other materials provided with the distribution; 122SN/A * neither the name of the copyright holders nor the names of its 132SN/A * contributors may be used to endorse or promote products derived from 142SN/A * this software without specific prior written permission. 152SN/A * 162SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 282665Ssaidi@eecs.umich.edu * Authors: Nathan Binkert 292665Ssaidi@eecs.umich.edu * Ali Saidi 302SN/A */ 312SN/A 322SN/A#include <cstdlib> 332SN/A#include <cmath> 342SN/A 3556SN/A#include "sim/param.hh" 3656SN/A#include "base/random.hh" 371954SN/A#include "base/trace.hh" 382SN/A 392SN/Ausing namespace std; 402SN/A 412SN/Aclass RandomContext : public ParamContext 422SN/A{ 432SN/A public: 442SN/A RandomContext(const string &_iniSection) 452SN/A : ::ParamContext(_iniSection) {} 461296SN/A ~RandomContext() {} 472SN/A 482SN/A void checkParams(); 492SN/A}; 502SN/A 512SN/ARandomContext paramContext("random"); 522SN/A 532SN/AParam<unsigned> 542SN/Aseed(¶mContext, "seed", "seed to random number generator", 1); 552SN/A 562SN/Avoid 572SN/ARandomContext::checkParams() 582SN/A{ 591954SN/A ::srand48(seed); 602SN/A} 612SN/A 622SN/Along 632SN/AgetLong() 642SN/A{ 651954SN/A return mrand48(); 662SN/A} 672SN/A 681954SN/Aint64_t 691971SN/AgetUniform(int64_t min, int64_t max) 701954SN/A{ 711954SN/A double r; 721971SN/A r = drand48() * (max-min) + min; 731954SN/A return (int64_t)round(r); 741954SN/A} 751954SN/A 761954SN/Auint64_t 771971SN/AgetUniformPos(uint64_t min, uint64_t max) 781954SN/A{ 791954SN/A double r; 801971SN/A r = drand48() * (max-min) + min; 811954SN/A return (uint64_t)round(r); 821954SN/A} 831954SN/A 841954SN/A 852SN/A// idea for generating a double from erand48 862SN/Adouble 872SN/AgetDouble() 882SN/A{ 892SN/A union { 902SN/A uint32_t _long[2]; 912SN/A uint16_t _short[4]; 922SN/A }; 932SN/A 941954SN/A _long[0] = mrand48(); 951954SN/A _long[1] = mrand48(); 962SN/A 972SN/A return ldexp((double) _short[0], -48) + 982SN/A ldexp((double) _short[1], -32) + 992SN/A ldexp((double) _short[2], -16); 1002SN/A} 101