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 #ifndef __BASE_BIGINT_HH__
  32 #define __BASE_BIGINT_HH__
  33 // Create a couple of large int types for atomic reads
  34 struct m5_twin64_t {
  35     uint64_t a;
  36     uint64_t b;
  37     inline m5_twin64_t& operator=(const uint64_t x)
  38     {
  39         a = x;
  40         b = x;
  41         return *this;
  42     }
  43 };
  44
  45 struct m5_twin32_t {
  46     uint32_t a;
  47     uint32_t b;
  48     inline m5_twin32_t& operator=(const uint32_t x)
  49     {
  50         a = x;
  51         b = x;
  52         return *this;
  53     }
  54 };
  55
  56
  57 // This is for twin loads (two 64 bit values), not 1 128 bit value (as far as
  58 // endian conversion is concerned!
  59 typedef m5_twin64_t Twin64_t;
  60 typedef m5_twin32_t Twin32_t;
  61
  62
  63 #endif // __BASE_BIGINT_HH__
  64