base/random.hh

   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
  34 long getLong();
  35 double getDouble();
  36 uint64_t getUniformPos(uint64_t min, uint64_t max);
  37 int64_t getUniform(int64_t min, int64_t max);
  38
  39 template <typename T>
  40 struct Random;
  41
  42 template<> 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
  51 template<> 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
  60 template<> 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
  69 template<> 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
  78 template<> 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
  87 template<> 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
  96 template<> 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
 105 template<> 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
 114 template<> struct Random<float>
 115 {
 116     static float get()
 117     { return getDouble(); }
 118 };
 119
 120 template<> struct Random<double>
 121 {
 122     static double get()
 123     { return getDouble(); }
 124 };
 125
 126 #endif // __BASE_RANDOM_HH__