Merge ktlim@zizzer:/bk/m5

[gem5.git] / src / cpu / o3 / sat_counter.hh

diff --git a/src/cpu/o3/sat_counter.hh b/src/cpu/o3/sat_counter.hh
index b7cfe642329e7ac480e1ad56bc820c613dbed776..d01fd93ce1b9029bf5a2da24b670c60e690fbd8e 100644 (file)
--- a/src/cpu/o3/sat_counter.hh
+++ b/src/cpu/o3/sat_counter.hh
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005 The Regents of The University of Michigan
+ * Copyright (c) 2005-2006 The Regents of The University of Michigan
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,8 +26,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __CPU_O3_CPU_SAT_COUNTER_HH__
-#define __CPU_O3_CPU_SAT_COUNTER_HH__
+#ifndef __CPU_O3_SAT_COUNTER_HH__
+#define __CPU_O3_SAT_COUNTER_HH__
 
 #include "sim/host.hh"
 
@@ -44,47 +44,70 @@ class SatCounter
     /**
      * Constructor for the counter.
      */
-    SatCounter();
+    SatCounter()
+        : initialVal(0), counter(0)
+    { }
 
     /**
      * Constructor for the counter.
      * @param bits How many bits the counter will have.
      */
-    SatCounter(unsigned bits);
+    SatCounter(unsigned bits)
+        : initialVal(0), maxVal((1 << bits) - 1), counter(0)
+    { }
 
     /**
      * Constructor for the counter.
      * @param bits How many bits the counter will have.
      * @param initial_val Starting value for each counter.
      */
-    SatCounter(unsigned bits, unsigned initial_val);
+    SatCounter(unsigned bits, uint8_t initial_val)
+        : initialVal(initialVal), maxVal((1 << bits) - 1), counter(initial_val)
+    {
+        // Check to make sure initial value doesn't exceed the max
+        // counter value.
+        if (initial_val > maxVal) {
+            fatal("BP: Initial counter value exceeds max size.");
+        }
+    }
 
     /**
      * Sets the number of bits.
      */
-    void setBits(unsigned bits);
+    void setBits(unsigned bits) { maxVal = (1 << bits) - 1; }
+
+    void reset() { counter = initialVal; }
 
     /**
      * Increments the counter's current value.
      */
-    void increment();
+    void increment()
+    {
+        if (counter < maxVal) {
+            ++counter;
+        }
+    }
 
     /**
      * Decrements the counter's current value.
      */
-    void decrement();
+    void decrement()
+    {
+        if (counter > 0) {
+            --counter;
+        }
+    }
 
     /**
      * Read the counter's value.
      */
     const uint8_t read() const
-    {
-        return counter;
-    }
+    { return counter; }
 
   private:
+    uint8_t initialVal;
     uint8_t maxVal;
     uint8_t counter;
 };
 
-#endif // __CPU_O3_CPU_SAT_COUNTER_HH__
+#endif // __CPU_O3_SAT_COUNTER_HH__