Merge ktlim@zizzer.eecs.umich.edu:/bk/m5

into zamp.eecs.umich.edu:/z/ktlim2/m5

--HG--
extra : convert_revision : a58535776cf5a3d17f8d9f65144cdf8db54289aa

1 files changed, 43 insertions, 0 deletions

diff --git a/cpu/beta_cpu/sat_counter.cc b/cpu/beta_cpu/sat_counter.cc
new file mode 100644
index 000000000..da095c3e1
--- /dev/null
+++ b/cpu/beta_cpu/sat_counter.cc
@@ -0,0 +1,43 @@
+#include "base/misc.hh"
+#include "cpu/beta_cpu/sat_counter.hh"
+
+SatCounter::SatCounter()
+    : maxVal(0), counter(0)
+{
+}
+
+SatCounter::SatCounter(unsigned bits)
+    : maxVal((1 << bits) - 1), counter(0)
+{
+}
+
+SatCounter::SatCounter(unsigned bits, unsigned initial_val)
+    : maxVal((1 << bits) - 1), counter(initial_val)
+{
+    // Check to make sure initial value doesn't exceed the max counter value.
+    if (initial_val > maxVal) {
+        panic("BP: Initial counter value exceeds max size.");
+    }
+}
+
+void
+SatCounter::setBits(unsigned bits)
+{
+    maxVal = (1 << bits) - 1;
+}
+
+void
+SatCounter::increment()
+{
+    if(counter < maxVal) {
+        ++counter;
+    }
+}
+
+void
+SatCounter::decrement()
+{
+    if(counter > 0) {
+        --counter;
+    }
+}