random.cc revision 4394 
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