random.hh revision 2665:a124942bacb8 
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
37long getLong();
38double getDouble();
39uint64_t getUniformPos(uint64_t min, uint64_t max);
40int64_t getUniform(int64_t min, int64_t max);
41
42template <typename T>
43struct Random;
44
45template<> struct Random<int8_t>
46{
47    static int8_t get()
48    { return getLong() & (int8_t)-1; }
49
50    static int8_t uniform(int8_t min, int8_t max)
51    { return getUniform(min, max); }
52};
53
54template<> struct Random<uint8_t>
55{
56    static uint8_t get()
57    { return getLong() & (uint8_t)-1; }
58
59    static uint8_t uniform(uint8_t min, uint8_t max)
60    { return getUniformPos(min, max); }
61};
62
63template<> struct Random<int16_t>
64{
65    static int16_t get()
66    { return getLong() & (int16_t)-1; }
67
68    static int16_t uniform(int16_t min, int16_t max)
69    { return getUniform(min, max); }
70};
71
72template<> struct Random<uint16_t>
73{
74    static uint16_t get()
75    { return getLong() & (uint16_t)-1; }
76
77    static uint16_t uniform(uint16_t min, uint16_t max)
78    { return getUniformPos(min, max); }
79};
80
81template<> struct Random<int32_t>
82{
83    static int32_t get()
84    { return (int32_t)getLong(); }
85
86    static int32_t uniform(int32_t min, int32_t max)
87    { return getUniform(min, max); }
88};
89
90template<> struct Random<uint32_t>
91{
92    static uint32_t get()
93    { return (uint32_t)getLong(); }
94
95    static uint32_t uniform(uint32_t min, uint32_t max)
96    { return getUniformPos(min, max); }
97};
98
99template<> struct Random<int64_t>
100{
101    static int64_t get()
102    { return (int64_t)getLong() << 32 || (uint64_t)getLong(); }
103
104    static int64_t uniform(int64_t min, int64_t max)
105    { return getUniform(min, max); }
106};
107
108template<> struct Random<uint64_t>
109{
110    static uint64_t get()
111    { return (uint64_t)getLong() << 32 || (uint64_t)getLong(); }
112
113    static uint64_t uniform(uint64_t min, uint64_t max)
114    { return getUniformPos(min, max); }
115};
116
117template<> struct Random<float>
118{
119    static float get()
120    { return getDouble(); }
121};
122
123template<> struct Random<double>
124{
125    static double get()
126    { return getDouble(); }
127};
128
129#endif // __BASE_RANDOM_HH__
130