2bit_local.hh (11429:cf5af0cc3be4) 2bit_local.hh (11434:b5aed9d2d54e)
1/*
2 * Copyright (c) 2011, 2014 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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61class LocalBP : public BPredUnit
62{
63 public:
64 /**
65 * Default branch predictor constructor.
66 */
67 LocalBP(const LocalBPParams *params);
68
1/*
2 * Copyright (c) 2011, 2014 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

--- 52 unchanged lines hidden (view full) ---

61class LocalBP : public BPredUnit
62{
63 public:
64 /**
65 * Default branch predictor constructor.
66 */
67 LocalBP(const LocalBPParams *params);
68
69 virtual void uncondBranch(Addr pc, void * &bp_history);
69 virtual void uncondBranch(ThreadID tid, Addr pc, void * &bp_history);
70
71 /**
72 * Looks up the given address in the branch predictor and returns
73 * a true/false value as to whether it is taken.
74 * @param branch_addr The address of the branch to look up.
75 * @param bp_history Pointer to any bp history state.
76 * @return Whether or not the branch is taken.
77 */
70
71 /**
72 * Looks up the given address in the branch predictor and returns
73 * a true/false value as to whether it is taken.
74 * @param branch_addr The address of the branch to look up.
75 * @param bp_history Pointer to any bp history state.
76 * @return Whether or not the branch is taken.
77 */
78 bool lookup(Addr branch_addr, void * &bp_history);
78 bool lookup(ThreadID tid, Addr branch_addr, void * &bp_history);
79
80 /**
81 * Updates the branch predictor to Not Taken if a BTB entry is
82 * invalid or not found.
83 * @param branch_addr The address of the branch to look up.
84 * @param bp_history Pointer to any bp history state.
85 * @return Whether or not the branch is taken.
86 */
79
80 /**
81 * Updates the branch predictor to Not Taken if a BTB entry is
82 * invalid or not found.
83 * @param branch_addr The address of the branch to look up.
84 * @param bp_history Pointer to any bp history state.
85 * @return Whether or not the branch is taken.
86 */
87 void btbUpdate(Addr branch_addr, void * &bp_history);
87 void btbUpdate(ThreadID tid, Addr branch_addr, void * &bp_history);
88
89 /**
90 * Updates the branch predictor with the actual result of a branch.
91 * @param branch_addr The address of the branch to update.
92 * @param taken Whether or not the branch was taken.
93 */
88
89 /**
90 * Updates the branch predictor with the actual result of a branch.
91 * @param branch_addr The address of the branch to update.
92 * @param taken Whether or not the branch was taken.
93 */
94 void update(Addr branch_addr, bool taken, void *bp_history, bool squashed);
94 void update(ThreadID tid, Addr branch_addr, bool taken, void *bp_history,
95 bool squashed);
95
96
96 void retireSquashed(void *bp_history)
97 void retireSquashed(ThreadID tid, void *bp_history)
97 { assert(bp_history == NULL); }
98
98 { assert(bp_history == NULL); }
99
99 void squash(void *bp_history)
100 void squash(ThreadID tid, void *bp_history)
100 { assert(bp_history == NULL); }
101
102 void reset();
103
104 private:
105 /**
106 * Returns the taken/not taken prediction given the value of the
107 * counter.

--- 25 unchanged lines hidden --- 		101 { assert(bp_history == NULL); }
102
103 void reset();
104
105 private:
106 /**
107 * Returns the taken/not taken prediction given the value of the
108 * counter.

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