1 files changed, 129 insertions, 0 deletions
diff --git a/cpu/o3/2bit_local_pred.cc b/cpu/o3/2bit_local_pred.cc
new file mode 100644
index 000000000..d9744eec7
--- /dev/null
+++ b/cpu/o3/2bit_local_pred.cc
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2004-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "base/trace.hh"
+#include "cpu/o3/2bit_local_pred.hh"
+
+DefaultBP::DefaultBP(unsigned _localPredictorSize,
+                     unsigned _localCtrBits,
+                     unsigned _instShiftAmt)
+    : localPredictorSize(_localPredictorSize),
+      localCtrBits(_localCtrBits),
+      instShiftAmt(_instShiftAmt)
+{
+    // Should do checks here to make sure sizes are correct (powers of 2).
+
+    // Setup the index mask.
+    indexMask = localPredictorSize - 1;
+
+    DPRINTF(Fetch, "Branch predictor: index mask: %#x\n", indexMask);
+
+    // Setup the array of counters for the local predictor.
+    localCtrs = new SatCounter[localPredictorSize];
+
+    for (int i = 0; i < localPredictorSize; ++i)
+        localCtrs[i].setBits(_localCtrBits);
+
+    DPRINTF(Fetch, "Branch predictor: local predictor size: %i\n",
+            localPredictorSize);
+
+    DPRINTF(Fetch, "Branch predictor: local counter bits: %i\n", localCtrBits);
+
+    DPRINTF(Fetch, "Branch predictor: instruction shift amount: %i\n",
+            instShiftAmt);
+}
+
+bool
+DefaultBP::lookup(Addr &branch_addr)
+{
+    bool taken;
+    uint8_t local_prediction;
+    unsigned local_predictor_idx = getLocalIndex(branch_addr);
+
+    DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n",
+            local_predictor_idx);
+
+    assert(local_predictor_idx < localPredictorSize);
+
+    local_prediction = localCtrs[local_predictor_idx].read();
+
+    DPRINTF(Fetch, "Branch predictor: prediction is %i.\n",
+            (int)local_prediction);
+
+    taken = getPrediction(local_prediction);
+
+#if 0
+    // Speculative update.
+    if (taken) {
+        DPRINTF(Fetch, "Branch predictor: Branch updated as taken.\n");
+        localCtrs[local_predictor_idx].increment();
+    } else {
+        DPRINTF(Fetch, "Branch predictor: Branch updated as not taken.\n");
+        localCtrs[local_predictor_idx].decrement();
+    }
+#endif
+
+    return taken;
+}
+
+void
+DefaultBP::update(Addr &branch_addr, bool taken)
+{
+    unsigned local_predictor_idx;
+
+    // Update the local predictor.
+    local_predictor_idx = getLocalIndex(branch_addr);
+
+    DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n",
+            local_predictor_idx);
+
+    assert(local_predictor_idx < localPredictorSize);
+
+    if (taken) {
+        DPRINTF(Fetch, "Branch predictor: Branch updated as taken.\n");
+        localCtrs[local_predictor_idx].increment();
+    } else {
+        DPRINTF(Fetch, "Branch predictor: Branch updated as not taken.\n");
+        localCtrs[local_predictor_idx].decrement();
+    }
+}
+
+inline
+bool
+DefaultBP::getPrediction(uint8_t &count)
+{
+    // Get the MSB of the count
+    return (count >> (localCtrBits - 1));
+}
+
+inline
+unsigned
+DefaultBP::getLocalIndex(Addr &branch_addr)
+{
+    return (branch_addr >> instShiftAmt) & indexMask;
+}