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+/*
+ * Copyright (c) 2014 ARM Limited
+ * 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: Mitch Hayenga
+ */
+
+#ifndef __CPU_PRED_INDIRECT_HH__
+#define __CPU_PRED_INDIRECT_HH__
+
+#include <deque>
+
+#include "arch/isa_traits.hh"
+#include "config/the_isa.hh"
+#include "cpu/inst_seq.hh"
+
+class IndirectPredictor
+{
+ public:
+ IndirectPredictor(bool hash_ghr, bool hash_targets,
+ unsigned num_sets, unsigned num_ways,
+ unsigned tag_bits, unsigned path_len,
+ unsigned inst_shift, unsigned num_threads);
+ bool lookup(Addr br_addr, unsigned ghr, TheISA::PCState& br_target,
+ ThreadID tid);
+ void recordIndirect(Addr br_addr, Addr tgt_addr, InstSeqNum seq_num,
+ ThreadID tid);
+ void commit(InstSeqNum seq_num, ThreadID tid);
+ void squash(InstSeqNum seq_num, ThreadID tid);
+ void recordTarget(InstSeqNum seq_num, unsigned ghr,
+ const TheISA::PCState& target, ThreadID tid);
+
+ private:
+ const bool hashGHR;
+ const bool hashTargets;
+ const unsigned numSets;
+ const unsigned numWays;
+ const unsigned tagBits;
+ const unsigned pathLength;
+ const unsigned instShift;
+
+ struct IPredEntry
+ {
+ IPredEntry() : tag(0), target(0) { }
+ Addr tag;
+ TheISA::PCState target;
+ };
+
+ std::vector<std::vector<IPredEntry> > targetCache;
+
+ Addr getSetIndex(Addr br_addr, unsigned ghr, ThreadID tid);
+ Addr getTag(Addr br_addr);
+
+ struct HistoryEntry
+ {
+ HistoryEntry(Addr br_addr, Addr tgt_addr, InstSeqNum seq_num)
+ : pcAddr(br_addr), targetAddr(tgt_addr), seqNum(seq_num) { }
+ Addr pcAddr;
+ Addr targetAddr;
+ InstSeqNum seqNum;
+ };
+
+
+ struct ThreadInfo {
+ ThreadInfo() : headHistEntry(0) { }
+
+ std::deque<HistoryEntry> pathHist;
+ unsigned headHistEntry;
+ };
+
+ std::vector<ThreadInfo> threadInfo;
+};
+
+#endif // __CPU_PRED_INDIRECT_HH__