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  1. #include <iostream>
  2. #include <cstdint>
  3.  
  4. struct Addr {
  5.     uint32_t offset :  6;
  6.     uint32_t index  : 10;
  7.     uint32_t tag    : 16;
  8.  
  9.     Addr(uint32_t addr);
  10.  
  11.     operator uint32_t();
  12.  
  13.     void output();
  14. };
  15.  
  16. Addr::Addr(uint32_t addr)
  17.   : offset(addr & 0x3F),
  18.     index((addr & 0xFFC0) >> 6),
  19.     tag((addr & 0xFFFF0000) >> 16)
  20. {}
  21.  
  22.  
  23. Addr::operator uint32_t() {
  24.     return ((offset) | (index << 6) | (tag << 16));
  25. }
  26.  
  27. void Addr::output() {
  28.     std::cout << "Offset: " << std::dec << offset << "\t\t("  << std::hex << offset << ")\n"
  29.               << "Index:  " << std::dec << index  << "   \t(" << std::hex << index  << ")\n"
  30.               << "Tag:    " << std::dec << tag    << (tag > 999 ? "\t(" : "\t\t(")
  31.               												  << std::hex << tag    << ")\n";
  32. }
  33.  
  34. int main() {
  35.     Addr addr = 0xFFFFFFFF;
  36.     addr.output();
  37.     std::cout << std::hex << static_cast<uint32_t>(addr) << std::endl;
  38.  
  39.     std::cout << "And now, a couple changes...\n";
  40.     addr.offset = 0x1A;
  41.     addr.index  = 0x32F;
  42.     addr.output();
  43.     std::cout << std::hex << static_cast<uint32_t>(addr) << std::endl;
  44.  
  45.     std::cout << "Once more...\n";
  46.     addr = 0x12345678;
  47.     addr.output();
  48.     std::cout << std::hex << static_cast<uint32_t>(addr) << std::endl;
  49.  
  50.     std::cout << "And finally...\n";
  51.     addr = 0x00000001;
  52.     addr.output();
  53.     std::cout << std::hex << static_cast<uint32_t>(addr) << std::endl;
  54. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin 
Standard input is empty
stdout 
Offset: 63		(3f)
Index:  1023   	(3ff)
Tag:    65535	(ffff)
ffffffff
And now, a couple changes...
Offset: 26		(1a)
Index:  815   	(32f)
Tag:    65535	(ffff)
ffffcbda
Once more...
Offset: 56		(38)
Index:  345   	(159)
Tag:    4660	(1234)
12345678
And finally...
Offset: 1		(1)
Index:  0   	(0)
Tag:    0		(0)
1
https://ideone.com/dYIXX5
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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