random.hh revision 2632:1bb2f91485ea 
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
29#ifndef __BASE_RANDOM_HH__
30#define __BASE_RANDOM_HH__
31
32#include "sim/host.hh"
33
34long getLong();
35double getDouble();
36uint64_t getUniformPos(uint64_t min, uint64_t max);
37int64_t getUniform(int64_t min, int64_t max);
38
39template <typename T>
40struct Random;
41
42template<> struct Random<int8_t>
43{
44    static int8_t get()
45    { return getLong() & (int8_t)-1; }
46
47    static int8_t uniform(int8_t min, int8_t max)
48    { return getUniform(min, max); }
49};
50
51template<> struct Random<uint8_t>
52{
53    static uint8_t get()
54    { return getLong() & (uint8_t)-1; }
55
56    static uint8_t uniform(uint8_t min, uint8_t max)
57    { return getUniformPos(min, max); }
58};
59
60template<> struct Random<int16_t>
61{
62    static int16_t get()
63    { return getLong() & (int16_t)-1; }
64
65    static int16_t uniform(int16_t min, int16_t max)
66    { return getUniform(min, max); }
67};
68
69template<> struct Random<uint16_t>
70{
71    static uint16_t get()
72    { return getLong() & (uint16_t)-1; }
73
74    static uint16_t uniform(uint16_t min, uint16_t max)
75    { return getUniformPos(min, max); }
76};
77
78template<> struct Random<int32_t>
79{
80    static int32_t get()
81    { return (int32_t)getLong(); }
82
83    static int32_t uniform(int32_t min, int32_t max)
84    { return getUniform(min, max); }
85};
86
87template<> struct Random<uint32_t>
88{
89    static uint32_t get()
90    { return (uint32_t)getLong(); }
91
92    static uint32_t uniform(uint32_t min, uint32_t max)
93    { return getUniformPos(min, max); }
94};
95
96template<> struct Random<int64_t>
97{
98    static int64_t get()
99    { return (int64_t)getLong() << 32 || (uint64_t)getLong(); }
100
101    static int64_t uniform(int64_t min, int64_t max)
102    { return getUniform(min, max); }
103};
104
105template<> struct Random<uint64_t>
106{
107    static uint64_t get()
108    { return (uint64_t)getLong() << 32 || (uint64_t)getLong(); }
109
110    static uint64_t uniform(uint64_t min, uint64_t max)
111    { return getUniformPos(min, max); }
112};
113
114template<> struct Random<float>
115{
116    static float get()
117    { return getDouble(); }
118};
119
120template<> struct Random<double>
121{
122    static double get()
123    { return getDouble(); }
124};
125
126#endif // __BASE_RANDOM_HH__
127