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-/*
- * 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: Kevin Lim
- */
-
-#ifndef __CPU_OZONE_NULL_PREDICTOR_HH__
-#define __CPU_OZONE_NULL_PREDICTOR_HH__
-
-#include "base/types.hh"
-#include "cpu/inst_seq.hh"
-
-template <class Impl>
-class NullPredictor
-{
- public:
- typedef typename Impl::Params Params;
- typedef typename Impl::DynInstPtr DynInstPtr;
-
- NullPredictor(Params *p) { }
-
- struct BPredInfo {
- BPredInfo()
- : PC(0), nextPC(0)
- { }
-
- BPredInfo(const Addr &pc, const Addr &next_pc)
- : PC(pc), nextPC(next_pc)
- { }
-
- Addr PC;
- Addr nextPC;
- };
-
- BPredInfo lookup(Addr &PC) { return BPredInfo(PC, PC+4); }
-
- void undo(BPredInfo &bp_info) { return; }
-
- /**
- * Predicts whether or not the instruction is a taken branch, and the
- * target of the branch if it is taken.
- * @param inst The branch instruction.
- * @param PC The predicted PC is passed back through this parameter.
- * @param tid The thread id.
- * @return Returns if the branch is taken or not.
- */
- bool predict(DynInstPtr &inst, Addr &PC, ThreadID tid)
- { return false; }
-
- /**
- * Tells the branch predictor to commit any updates until the given
- * sequence number.
- * @param done_sn The sequence number to commit any older updates up until.
- * @param tid The thread id.
- */
- void update(const InstSeqNum &done_sn, ThreadID tid) { }
-
- /**
- * Squashes all outstanding updates until a given sequence number.
- * @param squashed_sn The sequence number to squash any younger updates up
- * until.
- * @param tid The thread id.
- */
- void squash(const InstSeqNum &squashed_sn, ThreadID tid) { }
-
- /**
- * Squashes all outstanding updates until a given sequence number, and
- * corrects that sn's update with the proper address and taken/not taken.
- * @param squashed_sn The sequence number to squash any younger updates up
- * until.
- * @param corr_target The correct branch target.
- * @param actually_taken The correct branch direction.
- * @param tid The thread id.
- */
- void squash(const InstSeqNum &squashed_sn, const Addr &corr_target,
- bool actually_taken, ThreadID tid)
- { }
-
-};
-
-#endif // __CPU_OZONE_NULL_PREDICTOR_HH__