random.cc revision 4394:dbaff14bb974
1/* 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 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 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 30 */ 31 32#ifdef __SUNPRO_CC 33#include <stdlib.h> 34#include <math.h> 35#endif 36 37#include <cstdlib> 38#include <cmath> 39 40#include "base/random.hh" 41 42using namespace std; 43 44uint32_t 45getInt32() 46{ 47 return mrand48() & 0xffffffff; 48} 49 50double 51getDouble() 52{ 53 return drand48(); 54} 55 56double 57m5round(double r) 58{ 59#if defined(__sun) 60 double val; 61 int oldrnd = m5_fegetround(); 62 m5_fesetround(M5_FP_TONEAREST); 63 val = rint(r); 64 m5_fesetround(oldrnd); 65 return val; 66#else 67 return round(r); 68#endif 69} 70 71int64_t 72getUniform(int64_t min, int64_t max) 73{ 74 double r; 75 r = drand48() * (max-min) + min; 76 77 return (int64_t)m5round(r); 78} 79 80uint64_t 81getUniformPos(uint64_t min, uint64_t max) 82{ 83 double r; 84 r = drand48() * (max-min) + min; 85 86 return (uint64_t)m5round(r); 87} 88