random.cc revision 4395:9acb011a6c35 
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/fenv.hh"
41#include "base/random.hh"
42
43using namespace std;
44
45uint32_t
46getInt32()
47{
48    return mrand48() & 0xffffffff;
49}
50
51double
52getDouble()
53{
54    return drand48();
55}
56
57double
58m5round(double r)
59{
60#if defined(__sun)
61    double val;
62    int oldrnd = m5_fegetround();
63    m5_fesetround(M5_FE_TONEAREST);
64    val = rint(r);
65    m5_fesetround(oldrnd);
66    return val;
67#else
68    return round(r);
69#endif
70}
71
72int64_t
73getUniform(int64_t min, int64_t max)
74{
75    double r;
76    r = drand48() * (max-min) + min;
77
78    return (int64_t)m5round(r);
79}
80
81uint64_t
82getUniformPos(uint64_t min, uint64_t max)
83{
84    double r;
85    r = drand48() * (max-min) + min;
86
87    return (uint64_t)m5round(r);
88}
89