random.hh revision 4045:43eb54e807d1
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#ifndef __BASE_RANDOM_HH__ 33#define __BASE_RANDOM_HH__ 34 35#include "sim/host.hh" 36 37uint32_t getUInt32(); 38double getDouble(); 39double m5random(double r); 40uint64_t getUniformPos(uint64_t min, uint64_t max); 41int64_t getUniform(int64_t min, int64_t max); 42 43template <typename T> 44struct Random; 45 46template<> struct Random<int8_t> 47{ 48 static int8_t get() 49 { return getUInt32() & (int8_t)-1; } 50 51 static int8_t uniform(int8_t min, int8_t max) 52 { return getUniform(min, max); } 53}; 54 55template<> struct Random<uint8_t> 56{ 57 static uint8_t get() 58 { return getUInt32() & (uint8_t)-1; } 59 60 static uint8_t uniform(uint8_t min, uint8_t max) 61 { return getUniformPos(min, max); } 62}; 63 64template<> struct Random<int16_t> 65{ 66 static int16_t get() 67 { return getUInt32() & (int16_t)-1; } 68 69 static int16_t uniform(int16_t min, int16_t max) 70 { return getUniform(min, max); } 71}; 72 73template<> struct Random<uint16_t> 74{ 75 static uint16_t get() 76 { return getUInt32() & (uint16_t)-1; } 77 78 static uint16_t uniform(uint16_t min, uint16_t max) 79 { return getUniformPos(min, max); } 80}; 81 82template<> struct Random<int32_t> 83{ 84 static int32_t get() 85 { return (int32_t)getUInt32(); } 86 87 static int32_t uniform(int32_t min, int32_t max) 88 { return getUniform(min, max); } 89}; 90 91template<> struct Random<uint32_t> 92{ 93 static uint32_t get() 94 { return (uint32_t)getUInt32(); } 95 96 static uint32_t uniform(uint32_t min, uint32_t max) 97 { return getUniformPos(min, max); } 98}; 99 100template<> struct Random<int64_t> 101{ 102 static int64_t get() 103 { return (int64_t)getUInt32() << 32 || (uint64_t)getUInt32(); } 104 105 static int64_t uniform(int64_t min, int64_t max) 106 { return getUniform(min, max); } 107}; 108 109template<> struct Random<uint64_t> 110{ 111 static uint64_t get() 112 { return (uint64_t)getUInt32() << 32 || (uint64_t)getUInt32(); } 113 114 static uint64_t uniform(uint64_t min, uint64_t max) 115 { return getUniformPos(min, max); } 116}; 117 118template<> struct Random<float> 119{ 120 static float get() 121 { return getDouble(); } 122}; 123 124template<> struct Random<double> 125{ 126 static double get() 127 { return getDouble(); } 128}; 129 130#endif // __BASE_RANDOM_HH__ 131