gem5 v24.1.0.1
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simple_btb.hh
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1/*
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39 */
40
41#ifndef __CPU_PRED_SIMPLE_BTB_HH__
42#define __CPU_PRED_SIMPLE_BTB_HH__
43
45#include "base/logging.hh"
46#include "base/types.hh"
47#include "cpu/pred/btb.hh"
48#include "cpu/pred/btb_entry.hh"
51#include "params/SimpleBTB.hh"
52
54{
55
57{
58 public:
59 SimpleBTB(const SimpleBTBParams &params);
60
61 void memInvalidate() override;
62 bool valid(ThreadID tid, Addr instPC) override;
63 const PCStateBase *lookup(ThreadID tid, Addr instPC,
64 BranchType type = BranchType::NoBranch) override;
65 void update(ThreadID tid, Addr instPC, const PCStateBase &target_pc,
66 BranchType type = BranchType::NoBranch,
67 StaticInstPtr inst = nullptr) override;
68 const StaticInstPtr getInst(ThreadID tid, Addr instPC) override;
69
70 private:
71
76 BTBEntry *findEntry(Addr instPC, ThreadID tid);
77
80};
81
82} // namespace gem5::branch_prediction
83
84#endif // __CPU_PRED_SIMPLE_BTB_HH__
Defines global host-dependent types: Counter, Tick, and (indirectly) {int,uint}{8,...
Declaration of a BTB entry and BTB indexing policy.
void update() const
Align cycle and tick to the next clock edge if not already done.
bool valid(ThreadID tid, Addr instPC) override
Checks if a branch address is in the BTB.
Definition simple_btb.cc:76
const PCStateBase * lookup(ThreadID tid, Addr instPC, BranchType type=BranchType::NoBranch) override
Looks up an address in the BTB to get the target of the branch.
Definition simple_btb.cc:87
void memInvalidate() override
Invalidate the contents of memory buffers.
Definition simple_btb.cc:64
BTBEntry * findEntry(Addr instPC, ThreadID tid)
Internal call to find an address in the BTB.
Definition simple_btb.cc:70
const StaticInstPtr getInst(ThreadID tid, Addr instPC) override
Looks up an address in the BTB and return the instruction information if existant.
AssociativeCache< BTBEntry > btb
The actual BTB.
Definition simple_btb.hh:79
const Params & params() const
Declaration of a common framework for indexing policies.
int16_t ThreadID
Thread index/ID type.
Definition types.hh:235
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition types.hh:147

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