random.cc revision 4045 
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#if defined(__sun)
33#include <ieeefp.h>
34#endif
35#ifdef __SUNPRO_CC
36#include <stdlib.h>
37#include <math.h>
38#endif
39
40#include <cstdlib>
41#include <cmath>
42
43#include "base/random.hh"
44
45using namespace std;
46
47uint32_t
48getInt32()
49{
50    return mrand48() & 0xffffffff;
51}
52
53double
54getDouble()
55{
56    return drand48();
57}
58
59double
60m5round(double r)
61{
62#if defined(__sun)
63    double val;
64    fp_rnd oldrnd = fpsetround(FP_RN);
65    val = rint(r);
66    fpsetround(oldrnd);
67    return val;
68#else
69    return round(r);
70#endif
71}
72
73int64_t
74getUniform(int64_t min, int64_t max)
75{
76    double r;
77    r = drand48() * (max-min) + min;
78
79    return (int64_t)m5round(r);
80}
81
82uint64_t
83getUniformPos(uint64_t min, uint64_t max)
84{
85    double r;
86    r = drand48() * (max-min) + min;
87
88    return (uint64_t)m5round(r);
89}
90