bpred_unit.hh (10462:e975e8afba8b) bpred_unit.hh (10785:f56c10663a01)
1/*
2 * Copyright (c) 2011-2012, 2014 ARM Limited
3 * Copyright (c) 2010 The University of Edinburgh
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

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92 */
93 bool predict(const StaticInstPtr &inst, const InstSeqNum &seqNum,
94 TheISA::PCState &pc, ThreadID tid);
95 bool predictInOrder(const StaticInstPtr &inst, const InstSeqNum &seqNum,
96 int asid, TheISA::PCState &instPC,
97 TheISA::PCState &predPC, ThreadID tid);
98
99 // @todo: Rename this function.
1/*
2 * Copyright (c) 2011-2012, 2014 ARM Limited
3 * Copyright (c) 2010 The University of Edinburgh
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

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92 */
93 bool predict(const StaticInstPtr &inst, const InstSeqNum &seqNum,
94 TheISA::PCState &pc, ThreadID tid);
95 bool predictInOrder(const StaticInstPtr &inst, const InstSeqNum &seqNum,
96 int asid, TheISA::PCState &instPC,
97 TheISA::PCState &predPC, ThreadID tid);
98
99 // @todo: Rename this function.
100 virtual void uncondBranch(void * &bp_history) = 0;
100 virtual void uncondBranch(Addr pc, void * &bp_history) = 0;
101
102 /**
103 * Tells the branch predictor to commit any updates until the given
104 * sequence number.
105 * @param done_sn The sequence number to commit any older updates up until.
106 * @param tid The thread id.
107 */
108 void update(const InstSeqNum &done_sn, ThreadID tid);

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255
256 /** Whether this instruction has already mispredicted/updated bp */
257 bool wasSquashed;
258 };
259
260 typedef std::deque<PredictorHistory> History;
261
262 /** Number of the threads for which the branch history is maintained. */
101
102 /**
103 * Tells the branch predictor to commit any updates until the given
104 * sequence number.
105 * @param done_sn The sequence number to commit any older updates up until.
106 * @param tid The thread id.
107 */
108 void update(const InstSeqNum &done_sn, ThreadID tid);

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255
256 /** Whether this instruction has already mispredicted/updated bp */
257 bool wasSquashed;
258 };
259
260 typedef std::deque<PredictorHistory> History;
261
262 /** Number of the threads for which the branch history is maintained. */
263 uint32_t numThreads;
263 const unsigned numThreads;
264
264
265
265 /**
266 * The per-thread predictor history. This is used to update the predictor
267 * as instructions are committed, or restore it to the proper state after
268 * a squash.
269 */
270 std::vector<History> predHist;
271
272 /** The BTB. */

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290 /** Stat for percent times an entry in BTB found. */
291 Stats::Formula BTBHitPct;
292 /** Stat for number of times the RAS is used to get a target. */
293 Stats::Scalar usedRAS;
294 /** Stat for number of times the RAS is incorrect. */
295 Stats::Scalar RASIncorrect;
296
297 protected:
266 /**
267 * The per-thread predictor history. This is used to update the predictor
268 * as instructions are committed, or restore it to the proper state after
269 * a squash.
270 */
271 std::vector<History> predHist;
272
273 /** The BTB. */

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291 /** Stat for percent times an entry in BTB found. */
292 Stats::Formula BTBHitPct;
293 /** Stat for number of times the RAS is used to get a target. */
294 Stats::Scalar usedRAS;
295 /** Stat for number of times the RAS is incorrect. */
296 Stats::Scalar RASIncorrect;
297
298 protected:
299 /** Number of bits to shift instructions by for predictor addresses. */
300 const unsigned instShiftAmt;
301
298 /**
299 * @{
300 * @name PMU Probe points.
301 */
302
303 /**
304 * Helper method to instantiate probe points belonging to this
305 * object.

--- 21 unchanged lines hidden --- 		302 /**
303 * @{
304 * @name PMU Probe points.
305 */
306
307 /**
308 * Helper method to instantiate probe points belonging to this
309 * object.

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