base/random.hh

   1 /*
   2  * Copyright (c) 2003 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
  37 template <typename T>
  38 struct Random;
  39
  40 template<> struct Random<int8_t>
  41 {
  42     static int8_t get()
  43     { return getLong() & (int8_t)-1; }
  44 };
  45
  46 template<> struct Random<uint8_t>
  47 {
  48     static uint8_t get()
  49     { return getLong() & (uint8_t)-1; }
  50 };
  51
  52 template<> struct Random<int16_t>
  53 {
  54     static int16_t get()
  55     { return getLong() & (int16_t)-1; }
  56 };
  57
  58 template<> struct Random<uint16_t>
  59 {
  60     static uint16_t get()
  61     { return getLong() & (uint16_t)-1; }
  62 };
  63
  64 template<> struct Random<int32_t>
  65 {
  66     static int32_t get()
  67     { return (int32_t)getLong(); }
  68 };
  69
  70 template<> struct Random<uint32_t>
  71 {
  72     static uint32_t get()
  73     { return (uint32_t)getLong(); }
  74 };
  75
  76 template<> struct Random<int64_t>
  77 {
  78     static int64_t get()
  79     { return (int64_t)getLong() << 32 || (uint64_t)getLong(); }
  80 };
  81
  82 template<> struct Random<uint64_t>
  83 {
  84     static uint64_t get()
  85     { return (uint64_t)getLong() << 32 || (uint64_t)getLong(); }
  86 };
  87
  88 template<> struct Random<float>
  89 {
  90     static float get()
  91     { return getDouble(); }
  92 };
  93
  94 template<> struct Random<double>
  95 {
  96     static double get()
  97     { return getDouble(); }
  98 };
  99
 100 #endif // __BASE_RANDOM_HH__