cpu/beta_cpu/sat_counter.cc

   1 #include "base/misc.hh"
   2 #include "cpu/beta_cpu/sat_counter.hh"
   3
   4 SatCounter::SatCounter()
   5     : maxVal(0), counter(0)
   6 {
   7 }
   8
   9 SatCounter::SatCounter(unsigned bits)
  10     : maxVal((1 << bits) - 1), counter(0)
  11 {
  12 }
  13
  14 SatCounter::SatCounter(unsigned bits, unsigned initial_val)
  15     : maxVal((1 << bits) - 1), counter(initial_val)
  16 {
  17     // Check to make sure initial value doesn't exceed the max counter value.
  18     if (initial_val > maxVal) {
  19         panic("BP: Initial counter value exceeds max size.");
  20     }
  21 }
  22
  23 void
  24 SatCounter::setBits(unsigned bits)
  25 {
  26     maxVal = (1 << bits) - 1;
  27 }
  28
  29 void
  30 SatCounter::increment()
  31 {
  32     if(counter < maxVal) {
  33         ++counter;
  34     }
  35 }
  36
  37 void
  38 SatCounter::decrement()
  39 {
  40     if(counter > 0) {
  41         --counter;
  42     }
  43 }