move: put predictor includes and cc files into the same place

--HG--
rename : src/cpu/2bit_local_pred.cc => src/cpu/pred/2bit_local.cc
rename : src/cpu/o3/2bit_local_pred.hh => src/cpu/pred/2bit_local.hh
rename : src/cpu/btb.cc => src/cpu/pred/btb.cc
rename : src/cpu/o3/btb.hh => src/cpu/pred/btb.hh
rename : src/cpu/ras.cc => src/cpu/pred/ras.cc
rename : src/cpu/o3/ras.hh => src/cpu/pred/ras.hh
rename : src/cpu/tournament_pred.cc => src/cpu/pred/tournament.cc
rename : src/cpu/o3/tournament_pred.hh => src/cpu/pred/tournament.hh

9 files changed, 1259 insertions, 0 deletions

diff --git a/src/cpu/pred/2bit_local.cc b/src/cpu/pred/2bit_local.cc
new file mode 100644
index 000000000..65925fe79
--- /dev/null
+++ b/src/cpu/pred/2bit_local.cc
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2004-2006 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#include "base/intmath.hh"
+#include "base/misc.hh"
+#include "base/trace.hh"
+#include "cpu/pred/2bit_local.hh"
+
+LocalBP::LocalBP(unsigned _localPredictorSize,
+                 unsigned _localCtrBits,
+                 unsigned _instShiftAmt)
+    : localPredictorSize(_localPredictorSize),
+      localCtrBits(_localCtrBits),
+      instShiftAmt(_instShiftAmt)
+{
+    if (!isPowerOf2(localPredictorSize)) {
+        fatal("Invalid local predictor size!\n");
+    }
+
+    localPredictorSets = localPredictorSize / localCtrBits;
+
+    if (!isPowerOf2(localPredictorSets)) {
+        fatal("Invalid number of local predictor sets! Check localCtrBits.\n");
+    }
+
+    // Setup the index mask.
+    indexMask = localPredictorSets - 1;
+
+    DPRINTF(Fetch, "Branch predictor: index mask: %#x\n", indexMask);
+
+    // Setup the array of counters for the local predictor.
+    localCtrs.resize(localPredictorSets);
+
+    for (int i = 0; i < localPredictorSets; ++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);
+}
+
+void
+LocalBP::reset()
+{
+    for (int i = 0; i < localPredictorSets; ++i) {
+        localCtrs[i].reset();
+    }
+}
+
+bool
+LocalBP::lookup(Addr &branch_addr, void * &bp_history)
+{
+    bool taken;
+    uint8_t counter_val;
+    unsigned local_predictor_idx = getLocalIndex(branch_addr);
+
+    DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n",
+            local_predictor_idx);
+
+    counter_val = localCtrs[local_predictor_idx].read();
+
+    DPRINTF(Fetch, "Branch predictor: prediction is %i.\n",
+            (int)counter_val);
+
+    taken = getPrediction(counter_val);
+
+#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
+LocalBP::update(Addr &branch_addr, bool taken, void *bp_history)
+{
+    assert(bp_history == NULL);
+    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);
+
+    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
+LocalBP::getPrediction(uint8_t &count)
+{
+    // Get the MSB of the count
+    return (count >> (localCtrBits - 1));
+}
+
+inline
+unsigned
+LocalBP::getLocalIndex(Addr &branch_addr)
+{
+    return (branch_addr >> instShiftAmt) & indexMask;
+}
diff --git a/src/cpu/pred/2bit_local.hh b/src/cpu/pred/2bit_local.hh
new file mode 100644
index 000000000..8b7bb8463
--- /dev/null
+++ b/src/cpu/pred/2bit_local.hh
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2004-2006 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#ifndef __CPU_O3_2BIT_LOCAL_PRED_HH__
+#define __CPU_O3_2BIT_LOCAL_PRED_HH__
+
+#include <vector>
+
+#include "base/types.hh"
+#include "cpu/o3/sat_counter.hh"
+
+/**
+ * Implements a local predictor that uses the PC to index into a table of
+ * counters.  Note that any time a pointer to the bp_history is given, it
+ * should be NULL using this predictor because it does not have any branch
+ * predictor state that needs to be recorded or updated; the update can be
+ * determined solely by the branch being taken or not taken.
+ */
+class LocalBP
+{
+  public:
+    /**
+     * Default branch predictor constructor.
+     * @param localPredictorSize Size of the local predictor.
+     * @param localCtrBits Number of bits per counter.
+     * @param instShiftAmt Offset amount for instructions to ignore alignment.
+     */
+    LocalBP(unsigned localPredictorSize, unsigned localCtrBits,
+            unsigned instShiftAmt);
+
+    /**
+     * Looks up the given address in the branch predictor and returns
+     * a true/false value as to whether it is taken.
+     * @param branch_addr The address of the branch to look up.
+     * @param bp_history Pointer to any bp history state.
+     * @return Whether or not the branch is taken.
+     */
+    bool lookup(Addr &branch_addr, void * &bp_history);
+
+    /**
+     * Updates the branch predictor with the actual result of a branch.
+     * @param branch_addr The address of the branch to update.
+     * @param taken Whether or not the branch was taken.
+     */
+    void update(Addr &branch_addr, bool taken, void *bp_history);
+
+    void squash(void *bp_history)
+    { assert(bp_history == NULL); }
+
+    void reset();
+
+  private:
+    /**
+     *  Returns the taken/not taken prediction given the value of the
+     *  counter.
+     *  @param count The value of the counter.
+     *  @return The prediction based on the counter value.
+     */
+    inline bool getPrediction(uint8_t &count);
+
+    /** Calculates the local index based on the PC. */
+    inline unsigned getLocalIndex(Addr &PC);
+
+    /** Array of counters that make up the local predictor. */
+    std::vector<SatCounter> localCtrs;
+
+    /** Size of the local predictor. */
+    unsigned localPredictorSize;
+
+    /** Number of sets. */
+    unsigned localPredictorSets;
+
+    /** Number of bits of the local predictor's counters. */
+    unsigned localCtrBits;
+
+    /** Number of bits to shift the PC when calculating index. */
+    unsigned instShiftAmt;
+
+    /** Mask to get index bits. */
+    unsigned indexMask;
+};
+
+#endif // __CPU_O3_2BIT_LOCAL_PRED_HH__
diff --git a/src/cpu/pred/SConscript b/src/cpu/pred/SConscript
new file mode 100644
index 000000000..ce1dab9e2
--- /dev/null
+++ b/src/cpu/pred/SConscript
@@ -0,0 +1,38 @@
+# -*- mode:python -*-
+
+# Copyright (c) 2006 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.
+#
+# Authors: Steve Reinhardt
+
+Import('*')
+
+if 'InOrderCPU' in env['CPU_MODELS'] or 'O3CPU' in env['CPU_MODELS']:
+    Source('2bit_local.cc')
+    Source('btb.cc')
+    Source('ras.cc')
+    Source('tournament.cc')
+    TraceFlag('FreeList')
diff --git a/src/cpu/pred/btb.cc b/src/cpu/pred/btb.cc
new file mode 100644
index 000000000..81676aceb
--- /dev/null
+++ b/src/cpu/pred/btb.cc
@@ -0,0 +1,134 @@
+/*
+ * 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#include "base/intmath.hh"
+#include "base/trace.hh"
+#include "cpu/pred/btb.hh"
+
+DefaultBTB::DefaultBTB(unsigned _numEntries,
+                       unsigned _tagBits,
+                       unsigned _instShiftAmt)
+    : numEntries(_numEntries),
+      tagBits(_tagBits),
+      instShiftAmt(_instShiftAmt)
+{
+    DPRINTF(Fetch, "BTB: Creating BTB object.\n");
+
+    if (!isPowerOf2(numEntries)) {
+        fatal("BTB entries is not a power of 2!");
+    }
+
+    btb.resize(numEntries);
+
+    for (int i = 0; i < numEntries; ++i) {
+        btb[i].valid = false;
+    }
+
+    idxMask = numEntries - 1;
+
+    tagMask = (1 << tagBits) - 1;
+
+    tagShiftAmt = instShiftAmt + floorLog2(numEntries);
+}
+
+void
+DefaultBTB::reset()
+{
+    for (int i = 0; i < numEntries; ++i) {
+        btb[i].valid = false;
+    }
+}
+
+inline
+unsigned
+DefaultBTB::getIndex(const Addr &inst_PC)
+{
+    // Need to shift PC over by the word offset.
+    return (inst_PC >> instShiftAmt) & idxMask;
+}
+
+inline
+Addr
+DefaultBTB::getTag(const Addr &inst_PC)
+{
+    return (inst_PC >> tagShiftAmt) & tagMask;
+}
+
+bool
+DefaultBTB::valid(const Addr &inst_PC, ThreadID tid)
+{
+    unsigned btb_idx = getIndex(inst_PC);
+
+    Addr inst_tag = getTag(inst_PC);
+
+    assert(btb_idx < numEntries);
+
+    if (btb[btb_idx].valid
+        && inst_tag == btb[btb_idx].tag
+        && btb[btb_idx].tid == tid) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+// @todo Create some sort of return struct that has both whether or not the
+// address is valid, and also the address.  For now will just use addr = 0 to
+// represent invalid entry.
+Addr
+DefaultBTB::lookup(const Addr &inst_PC, ThreadID tid)
+{
+    unsigned btb_idx = getIndex(inst_PC);
+
+    Addr inst_tag = getTag(inst_PC);
+
+    assert(btb_idx < numEntries);
+
+    if (btb[btb_idx].valid
+        && inst_tag == btb[btb_idx].tag
+        && btb[btb_idx].tid == tid) {
+        return btb[btb_idx].target;
+    } else {
+        return 0;
+    }
+}
+
+void
+DefaultBTB::update(const Addr &inst_PC, const Addr &target, ThreadID tid)
+{
+    unsigned btb_idx = getIndex(inst_PC);
+
+    assert(btb_idx < numEntries);
+
+    btb[btb_idx].tid = tid;
+    btb[btb_idx].valid = true;
+    btb[btb_idx].target = target;
+    btb[btb_idx].tag = getTag(inst_PC);
+}
diff --git a/src/cpu/pred/btb.hh b/src/cpu/pred/btb.hh
new file mode 100644
index 000000000..6557522e0
--- /dev/null
+++ b/src/cpu/pred/btb.hh
@@ -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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#ifndef __CPU_O3_BTB_HH__
+#define __CPU_O3_BTB_HH__
+
+#include "base/misc.hh"
+#include "base/types.hh"
+
+class DefaultBTB
+{
+  private:
+    struct BTBEntry
+    {
+        BTBEntry()
+            : tag(0), target(0), valid(false)
+        {
+        }
+
+        /** The entry's tag. */
+        Addr tag;
+
+        /** The entry's target. */
+        Addr target;
+
+        /** The entry's thread id. */
+        ThreadID tid;
+
+        /** Whether or not the entry is valid. */
+        bool valid;
+    };
+
+  public:
+    /** Creates a BTB with the given number of entries, number of bits per
+     *  tag, and instruction offset amount.
+     *  @param numEntries Number of entries for the BTB.
+     *  @param tagBits Number of bits for each tag in the BTB.
+     *  @param instShiftAmt Offset amount for instructions to ignore alignment.
+     */
+    DefaultBTB(unsigned numEntries, unsigned tagBits,
+               unsigned instShiftAmt);
+
+    void reset();
+
+    /** Looks up an address in the BTB. Must call valid() first on the address.
+     *  @param inst_PC The address of the branch to look up.
+     *  @param tid The thread id.
+     *  @return Returns the target of the branch.
+     */
+    Addr lookup(const Addr &inst_PC, ThreadID tid);
+
+    /** Checks if a branch is in the BTB.
+     *  @param inst_PC The address of the branch to look up.
+     *  @param tid The thread id.
+     *  @return Whether or not the branch exists in the BTB.
+     */
+    bool valid(const Addr &inst_PC, ThreadID tid);
+
+    /** Updates the BTB with the target of a branch.
+     *  @param inst_PC The address of the branch being updated.
+     *  @param target_PC The target address of the branch.
+     *  @param tid The thread id.
+     */
+    void update(const Addr &inst_PC, const Addr &target_PC,
+                ThreadID tid);
+
+  private:
+    /** Returns the index into the BTB, based on the branch's PC.
+     *  @param inst_PC The branch to look up.
+     *  @return Returns the index into the BTB.
+     */
+    inline unsigned getIndex(const Addr &inst_PC);
+
+    /** Returns the tag bits of a given address.
+     *  @param inst_PC The branch's address.
+     *  @return Returns the tag bits.
+     */
+    inline Addr getTag(const Addr &inst_PC);
+
+    /** The actual BTB. */
+    std::vector<BTBEntry> btb;
+
+    /** The number of entries in the BTB. */
+    unsigned numEntries;
+
+    /** The index mask. */
+    unsigned idxMask;
+
+    /** The number of tag bits per entry. */
+    unsigned tagBits;
+
+    /** The tag mask. */
+    unsigned tagMask;
+
+    /** Number of bits to shift PC when calculating index. */
+    unsigned instShiftAmt;
+
+    /** Number of bits to shift PC when calculating tag. */
+    unsigned tagShiftAmt;
+};
+
+#endif // __CPU_O3_BTB_HH__
diff --git a/src/cpu/pred/ras.cc b/src/cpu/pred/ras.cc
new file mode 100644
index 000000000..5af188749
--- /dev/null
+++ b/src/cpu/pred/ras.cc
@@ -0,0 +1,84 @@
+/*
+ * 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#include "cpu/pred/ras.hh"
+
+void
+ReturnAddrStack::init(unsigned _numEntries)
+{
+     numEntries  = _numEntries;
+     usedEntries = 0;
+     tos = 0;
+
+     addrStack.resize(numEntries);
+
+     for (int i = 0; i < numEntries; ++i)
+         addrStack[i] = 0;
+}
+
+void
+ReturnAddrStack::reset()
+{
+    usedEntries = 0;
+    tos = 0;
+    for (int i = 0; i < numEntries; ++i)
+        addrStack[i] = 0;
+}
+
+void
+ReturnAddrStack::push(const Addr &return_addr)
+{
+    incrTos();
+
+    addrStack[tos] = return_addr;
+
+    if (usedEntries != numEntries) {
+        ++usedEntries;
+    }
+}
+
+void
+ReturnAddrStack::pop()
+{
+    if (usedEntries > 0) {
+        --usedEntries;
+    }
+
+    decrTos();
+}
+
+void
+ReturnAddrStack::restore(unsigned top_entry_idx,
+                         const Addr &restored_target)
+{
+    tos = top_entry_idx;
+
+    addrStack[tos] = restored_target;
+}
diff --git a/src/cpu/pred/ras.hh b/src/cpu/pred/ras.hh
new file mode 100644
index 000000000..a36faf79a
--- /dev/null
+++ b/src/cpu/pred/ras.hh
@@ -0,0 +1,100 @@
+/*
+ * 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#ifndef __CPU_O3_RAS_HH__
+#define __CPU_O3_RAS_HH__
+
+#include <vector>
+
+#include "base/types.hh"
+
+/** Return address stack class, implements a simple RAS. */
+class ReturnAddrStack
+{
+  public:
+    /** Creates a return address stack, but init() must be called prior to
+     *  use.
+     */
+    ReturnAddrStack() {}
+
+    /** Initializes RAS with a specified number of entries.
+     *  @param numEntries Number of entries in the RAS.
+     */
+    void init(unsigned numEntries);
+
+    void reset();
+
+    /** Returns the top address on the RAS. */
+    Addr top()
+    { return addrStack[tos]; }
+
+    /** Returns the index of the top of the RAS. */
+    unsigned topIdx()
+    { return tos; }
+
+    /** Pushes an address onto the RAS. */
+    void push(const Addr &return_addr);
+
+    /** Pops the top address from the RAS. */
+    void pop();
+
+    /** Changes index to the top of the RAS, and replaces the top address with
+     *  a new target.
+     *  @param top_entry_idx The index of the RAS that will now be the top.
+     *  @param restored_target The new target address of the new top of the RAS.
+     */
+    void restore(unsigned top_entry_idx, const Addr &restored_target);
+
+     bool empty() { return usedEntries == 0; }
+
+     bool full() { return usedEntries == numEntries; }
+  private:
+    /** Increments the top of stack index. */
+    inline void incrTos()
+    { if (++tos == numEntries) tos = 0; }
+
+    /** Decrements the top of stack index. */
+    inline void decrTos()
+    { tos = (tos == 0 ? numEntries - 1 : tos - 1); }
+
+    /** The RAS itself. */
+    std::vector<Addr> addrStack;
+
+    /** The number of entries in the RAS. */
+    unsigned numEntries;
+
+    /** The number of used entries in the RAS. */
+    unsigned usedEntries;
+
+    /** The top of stack index. */
+    unsigned tos;
+};
+
+#endif // __CPU_O3_RAS_HH__
diff --git a/src/cpu/pred/tournament.cc b/src/cpu/pred/tournament.cc
new file mode 100644
index 000000000..223e45333
--- /dev/null
+++ b/src/cpu/pred/tournament.cc
@@ -0,0 +1,297 @@
+/*
+ * Copyright (c) 2004-2006 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#include "base/intmath.hh"
+#include "cpu/pred/tournament.hh"
+
+TournamentBP::TournamentBP(unsigned _localPredictorSize,
+                           unsigned _localCtrBits,
+                           unsigned _localHistoryTableSize,
+                           unsigned _localHistoryBits,
+                           unsigned _globalPredictorSize,
+                           unsigned _globalCtrBits,
+                           unsigned _globalHistoryBits,
+                           unsigned _choicePredictorSize,
+                           unsigned _choiceCtrBits,
+                           unsigned _instShiftAmt)
+    : localPredictorSize(_localPredictorSize),
+      localCtrBits(_localCtrBits),
+      localHistoryTableSize(_localHistoryTableSize),
+      localHistoryBits(_localHistoryBits),
+      globalPredictorSize(_globalPredictorSize),
+      globalCtrBits(_globalCtrBits),
+      globalHistoryBits(_globalHistoryBits),
+      choicePredictorSize(_globalPredictorSize),
+      choiceCtrBits(_choiceCtrBits),
+      instShiftAmt(_instShiftAmt)
+{
+    if (!isPowerOf2(localPredictorSize)) {
+        fatal("Invalid local predictor size!\n");
+    }
+
+    //Setup the array of counters for the local predictor
+    localCtrs.resize(localPredictorSize);
+
+    for (int i = 0; i < localPredictorSize; ++i)
+        localCtrs[i].setBits(localCtrBits);
+
+    localPredictorMask = floorPow2(localPredictorSize) - 1;
+
+    if (!isPowerOf2(localHistoryTableSize)) {
+        fatal("Invalid local history table size!\n");
+    }
+
+    //Setup the history table for the local table
+    localHistoryTable.resize(localHistoryTableSize);
+
+    for (int i = 0; i < localHistoryTableSize; ++i)
+        localHistoryTable[i] = 0;
+
+    // Setup the local history mask
+    localHistoryMask = (1 << localHistoryBits) - 1;
+
+    if (!isPowerOf2(globalPredictorSize)) {
+        fatal("Invalid global predictor size!\n");
+    }
+
+    //Setup the array of counters for the global predictor
+    globalCtrs.resize(globalPredictorSize);
+
+    for (int i = 0; i < globalPredictorSize; ++i)
+        globalCtrs[i].setBits(globalCtrBits);
+
+    //Clear the global history
+    globalHistory = 0;
+    // Setup the global history mask
+    globalHistoryMask = (1 << globalHistoryBits) - 1;
+
+    if (!isPowerOf2(choicePredictorSize)) {
+        fatal("Invalid choice predictor size!\n");
+    }
+
+    //Setup the array of counters for the choice predictor
+    choiceCtrs.resize(choicePredictorSize);
+
+    for (int i = 0; i < choicePredictorSize; ++i)
+        choiceCtrs[i].setBits(choiceCtrBits);
+
+    // @todo: Allow for different thresholds between the predictors.
+    threshold = (1 << (localCtrBits - 1)) - 1;
+    threshold = threshold / 2;
+}
+
+inline
+unsigned
+TournamentBP::calcLocHistIdx(Addr &branch_addr)
+{
+    // Get low order bits after removing instruction offset.
+    return (branch_addr >> instShiftAmt) & (localHistoryTableSize - 1);
+}
+
+inline
+void
+TournamentBP::updateGlobalHistTaken()
+{
+    globalHistory = (globalHistory << 1) | 1;
+    globalHistory = globalHistory & globalHistoryMask;
+}
+
+inline
+void
+TournamentBP::updateGlobalHistNotTaken()
+{
+    globalHistory = (globalHistory << 1);
+    globalHistory = globalHistory & globalHistoryMask;
+}
+
+inline
+void
+TournamentBP::updateLocalHistTaken(unsigned local_history_idx)
+{
+    localHistoryTable[local_history_idx] =
+        (localHistoryTable[local_history_idx] << 1) | 1;
+}
+
+inline
+void
+TournamentBP::updateLocalHistNotTaken(unsigned local_history_idx)
+{
+    localHistoryTable[local_history_idx] =
+        (localHistoryTable[local_history_idx] << 1);
+}
+
+bool
+TournamentBP::lookup(Addr &branch_addr, void * &bp_history)
+{
+    bool local_prediction;
+    unsigned local_history_idx;
+    unsigned local_predictor_idx;
+
+    bool global_prediction;
+    bool choice_prediction;
+
+    //Lookup in the local predictor to get its branch prediction
+    local_history_idx = calcLocHistIdx(branch_addr);
+    local_predictor_idx = localHistoryTable[local_history_idx]
+        & localPredictorMask;
+    local_prediction = localCtrs[local_predictor_idx].read() > threshold;
+
+    //Lookup in the global predictor to get its branch prediction
+    global_prediction = globalCtrs[globalHistory].read() > threshold;
+
+    //Lookup in the choice predictor to see which one to use
+    choice_prediction = choiceCtrs[globalHistory].read() > threshold;
+
+    // Create BPHistory and pass it back to be recorded.
+    BPHistory *history = new BPHistory;
+    history->globalHistory = globalHistory;
+    history->localPredTaken = local_prediction;
+    history->globalPredTaken = global_prediction;
+    history->globalUsed = choice_prediction;
+    bp_history = (void *)history;
+
+    assert(globalHistory < globalPredictorSize &&
+           local_history_idx < localHistoryTableSize &&
+           local_predictor_idx < localPredictorSize);
+
+    // Commented code is for doing speculative update of counters and
+    // all histories.
+    if (choice_prediction) {
+        if (global_prediction) {
+//            updateHistoriesTaken(local_history_idx);
+//            globalCtrs[globalHistory].increment();
+//            localCtrs[local_history_idx].increment();
+            updateGlobalHistTaken();
+            return true;
+        } else {
+//            updateHistoriesNotTaken(local_history_idx);
+//            globalCtrs[globalHistory].decrement();
+//            localCtrs[local_history_idx].decrement();
+            updateGlobalHistNotTaken();
+            return false;
+        }
+    } else {
+        if (local_prediction) {
+//            updateHistoriesTaken(local_history_idx);
+//            globalCtrs[globalHistory].increment();
+//            localCtrs[local_history_idx].increment();
+            updateGlobalHistTaken();
+            return true;
+        } else {
+//            updateHistoriesNotTaken(local_history_idx);
+//            globalCtrs[globalHistory].decrement();
+//            localCtrs[local_history_idx].decrement();
+            updateGlobalHistNotTaken();
+            return false;
+        }
+    }
+}
+
+void
+TournamentBP::uncondBr(void * &bp_history)
+{
+    // Create BPHistory and pass it back to be recorded.
+    BPHistory *history = new BPHistory;
+    history->globalHistory = globalHistory;
+    history->localPredTaken = true;
+    history->globalPredTaken = true;
+    bp_history = static_cast<void *>(history);
+
+    updateGlobalHistTaken();
+}
+
+void
+TournamentBP::update(Addr &branch_addr, bool taken, void *bp_history)
+{
+    unsigned local_history_idx;
+    unsigned local_predictor_idx;
+    unsigned local_predictor_hist;
+
+    // Get the local predictor's current prediction
+    local_history_idx = calcLocHistIdx(branch_addr);
+    local_predictor_hist = localHistoryTable[local_history_idx];
+    local_predictor_idx = local_predictor_hist & localPredictorMask;
+
+    // Update the choice predictor to tell it which one was correct if
+    // there was a prediction.
+    if (bp_history) {
+        BPHistory *history = static_cast<BPHistory *>(bp_history);
+        if (history->localPredTaken != history->globalPredTaken) {
+            // If the local prediction matches the actual outcome,
+            // decerement the counter.  Otherwise increment the
+            // counter.
+            if (history->localPredTaken == taken) {
+                choiceCtrs[globalHistory].decrement();
+            } else if (history->globalPredTaken == taken){
+                choiceCtrs[globalHistory].increment();
+            }
+        }
+
+        // We're done with this history, now delete it.
+        delete history;
+    }
+
+    assert(globalHistory < globalPredictorSize &&
+           local_history_idx < localHistoryTableSize &&
+           local_predictor_idx < localPredictorSize);
+
+    // Update the counters and local history with the proper
+    // resolution of the branch.  Global history is updated
+    // speculatively and restored upon squash() calls, so it does not
+    // need to be updated.
+    if (taken) {
+        localCtrs[local_predictor_idx].increment();
+        globalCtrs[globalHistory].increment();
+
+        updateLocalHistTaken(local_history_idx);
+    } else {
+        localCtrs[local_predictor_idx].decrement();
+        globalCtrs[globalHistory].decrement();
+
+        updateLocalHistNotTaken(local_history_idx);
+    }
+}
+
+void
+TournamentBP::squash(void *bp_history)
+{
+    BPHistory *history = static_cast<BPHistory *>(bp_history);
+
+    // Restore global history to state prior to this branch.
+    globalHistory = history->globalHistory;
+
+    // Delete this BPHistory now that we're done with it.
+    delete history;
+}
+
+#ifdef DEBUG
+int
+TournamentBP::BPHistory::newCount = 0;
+#endif
diff --git a/src/cpu/pred/tournament.hh b/src/cpu/pred/tournament.hh
new file mode 100644
index 000000000..96bd43ed6
--- /dev/null
+++ b/src/cpu/pred/tournament.hh
@@ -0,0 +1,221 @@
+/*
+ * Copyright (c) 2004-2006 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#ifndef __CPU_O3_TOURNAMENT_PRED_HH__
+#define __CPU_O3_TOURNAMENT_PRED_HH__
+
+#include <vector>
+
+#include "base/types.hh"
+#include "cpu/o3/sat_counter.hh"
+
+/**
+ * Implements a tournament branch predictor, hopefully identical to the one
+ * used in the 21264.  It has a local predictor, which uses a local history
+ * table to index into a table of counters, and a global predictor, which
+ * uses a global history to index into a table of counters.  A choice
+ * predictor chooses between the two.  Only the global history register
+ * is speculatively updated, the rest are updated upon branches committing
+ * or misspeculating.
+ */
+class TournamentBP
+{
+  public:
+    /**
+     * Default branch predictor constructor.
+     */
+    TournamentBP(unsigned localPredictorSize,
+                 unsigned localCtrBits,
+                 unsigned localHistoryTableSize,
+                 unsigned localHistoryBits,
+                 unsigned globalPredictorSize,
+                 unsigned globalHistoryBits,
+                 unsigned globalCtrBits,
+                 unsigned choicePredictorSize,
+                 unsigned choiceCtrBits,
+                 unsigned instShiftAmt);
+
+    /**
+     * Looks up the given address in the branch predictor and returns
+     * a true/false value as to whether it is taken.  Also creates a
+     * BPHistory object to store any state it will need on squash/update.
+     * @param branch_addr The address of the branch to look up.
+     * @param bp_history Pointer that will be set to the BPHistory object.
+     * @return Whether or not the branch is taken.
+     */
+    bool lookup(Addr &branch_addr, void * &bp_history);
+
+    /**
+     * Records that there was an unconditional branch, and modifies
+     * the bp history to point to an object that has the previous
+     * global history stored in it.
+     * @param bp_history Pointer that will be set to the BPHistory object.
+     */
+    void uncondBr(void * &bp_history);
+
+    /**
+     * Updates the branch predictor with the actual result of a branch.
+     * @param branch_addr The address of the branch to update.
+     * @param taken Whether or not the branch was taken.
+     * @param bp_history Pointer to the BPHistory object that was created
+     * when the branch was predicted.
+     */
+    void update(Addr &branch_addr, bool taken, void *bp_history);
+
+    /**
+     * Restores the global branch history on a squash.
+     * @param bp_history Pointer to the BPHistory object that has the
+     * previous global branch history in it.
+     */
+    void squash(void *bp_history);
+
+    /** Returns the global history. */
+    inline unsigned readGlobalHist() { return globalHistory; }
+
+  private:
+    /**
+     * Returns if the branch should be taken or not, given a counter
+     * value.
+     * @param count The counter value.
+     */
+    inline bool getPrediction(uint8_t &count);
+
+    /**
+     * Returns the local history index, given a branch address.
+     * @param branch_addr The branch's PC address.
+     */
+    inline unsigned calcLocHistIdx(Addr &branch_addr);
+
+    /** Updates global history as taken. */
+    inline void updateGlobalHistTaken();
+
+    /** Updates global history as not taken. */
+    inline void updateGlobalHistNotTaken();
+
+    /**
+     * Updates local histories as taken.
+     * @param local_history_idx The local history table entry that
+     * will be updated.
+     */
+    inline void updateLocalHistTaken(unsigned local_history_idx);
+
+    /**
+     * Updates local histories as not taken.
+     * @param local_history_idx The local history table entry that
+     * will be updated.
+     */
+    inline void updateLocalHistNotTaken(unsigned local_history_idx);
+
+    /**
+     * The branch history information that is created upon predicting
+     * a branch.  It will be passed back upon updating and squashing,
+     * when the BP can use this information to update/restore its
+     * state properly.
+     */
+    struct BPHistory {
+#ifdef DEBUG
+        BPHistory()
+        { newCount++; }
+        ~BPHistory()
+        { newCount--; }
+
+        static int newCount;
+#endif
+        unsigned globalHistory;
+        bool localPredTaken;
+        bool globalPredTaken;
+        bool globalUsed;
+    };
+
+    /** Local counters. */
+    std::vector<SatCounter> localCtrs;
+
+    /** Size of the local predictor. */
+    unsigned localPredictorSize;
+
+    /** Mask to get the proper index bits into the predictor. */
+    unsigned localPredictorMask;
+
+    /** Number of bits of the local predictor's counters. */
+    unsigned localCtrBits;
+
+    /** Array of local history table entries. */
+    std::vector<unsigned> localHistoryTable;
+
+    /** Size of the local history table. */
+    unsigned localHistoryTableSize;
+
+    /** Number of bits for each entry of the local history table.
+     *  @todo Doesn't this come from the size of the local predictor?
+     */
+    unsigned localHistoryBits;
+
+    /** Mask to get the proper local history. */
+    unsigned localHistoryMask;
+
+    /** Array of counters that make up the global predictor. */
+    std::vector<SatCounter> globalCtrs;
+
+    /** Size of the global predictor. */
+    unsigned globalPredictorSize;
+
+    /** Number of bits of the global predictor's counters. */
+    unsigned globalCtrBits;
+
+    /** Global history register. */
+    unsigned globalHistory;
+
+    /** Number of bits for the global history. */
+    unsigned globalHistoryBits;
+
+    /** Mask to get the proper global history. */
+    unsigned globalHistoryMask;
+
+    /** Array of counters that make up the choice predictor. */
+    std::vector<SatCounter> choiceCtrs;
+
+    /** Size of the choice predictor (identical to the global predictor). */
+    unsigned choicePredictorSize;
+
+    /** Number of bits of the choice predictor's counters. */
+    unsigned choiceCtrBits;
+
+    /** Number of bits to shift the instruction over to get rid of the word
+     *  offset.
+     */
+    unsigned instShiftAmt;
+
+    /** Threshold for the counter value; above the threshold is taken,
+     *  equal to or below the threshold is not taken.
+     */
+    unsigned threshold;
+};
+
+#endif // __CPU_O3_TOURNAMENT_PRED_HH__