src/base/bigint.hh

   1 /*
   2  * Copyright (c) 2006 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: Ali Saidi
  29  */
  30
  31 #include <iostream>
  32
  33 #include "base/misc.hh"
  34 #include "base/types.hh"
  35
  36 #ifndef __BASE_BIGINT_HH__
  37 #define __BASE_BIGINT_HH__
  38 // Create a couple of large int types for atomic reads
  39 struct m5_twin64_t {
  40     uint64_t a;
  41     uint64_t b;
  42     m5_twin64_t() : a(0), b(0)
  43     {}
  44     m5_twin64_t(const uint64_t x) : a(x), b(x)
  45     {}
  46     inline m5_twin64_t& operator=(const uint64_t x)
  47     {
  48         a = x;
  49         b = x;
  50         return *this;
  51     }
  52
  53     operator uint64_t()
  54     {
  55         panic("Tried to cram a twin64_t into an integer!\n");
  56         return a;
  57     }
  58 };
  59
  60 struct m5_twin32_t {
  61     uint32_t a;
  62     uint32_t b;
  63     m5_twin32_t()
  64     {}
  65     m5_twin32_t(const uint32_t x)
  66     {
  67         a = x;
  68         b = x;
  69     }
  70     inline m5_twin32_t& operator=(const uint32_t x)
  71     {
  72         a = x;
  73         b = x;
  74         return *this;
  75     }
  76
  77     operator uint32_t()
  78     {
  79         panic("Tried to cram a twin32_t into an integer!\n");
  80         return a;
  81     }
  82 };
  83
  84
  85 // This is for twin loads (two 64 bit values), not 1 128 bit value (as far as
  86 // endian conversion is concerned!
  87 typedef m5_twin64_t Twin64_t;
  88 typedef m5_twin32_t Twin32_t;
  89
  90 // Output operator overloads
  91 std::ostream & operator << (std::ostream & os, const Twin64_t & t);
  92 std::ostream & operator << (std::ostream & os, const Twin32_t & t);
  93
  94 #endif // __BASE_BIGINT_HH__
  95