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cpu
pred
simple_btb.hh
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/*
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* Copyright (c) 2022-2023 The University of Edinburgh
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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* modification, are permitted provided that the following conditions are
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*/
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#ifndef __CPU_PRED_SIMPLE_BTB_HH__
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#define __CPU_PRED_SIMPLE_BTB_HH__
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#include "
base/cache/associative_cache.hh
"
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#include "
base/logging.hh
"
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#include "
base/types.hh
"
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#include "
cpu/pred/btb.hh
"
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#include "
cpu/pred/btb_entry.hh
"
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#include "
mem/cache/replacement_policies/replaceable_entry.hh
"
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#include "
mem/cache/tags/indexing_policies/base.hh
"
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#include "params/SimpleBTB.hh"
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namespace
gem5::branch_prediction
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{
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class
SimpleBTB
:
public
BranchTargetBuffer
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{
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public
:
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SimpleBTB
(
const
SimpleBTBParams &
params
);
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void
memInvalidate
()
override
;
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bool
valid
(
ThreadID
tid,
Addr
instPC)
override
;
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const
PCStateBase
*
lookup
(
ThreadID
tid,
Addr
instPC,
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BranchType
type
= BranchType::NoBranch)
override
;
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void
update
(
ThreadID
tid,
Addr
instPC,
const
PCStateBase
&target_pc,
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BranchType
type
= BranchType::NoBranch,
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StaticInstPtr
inst =
nullptr
)
override
;
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const
StaticInstPtr
getInst
(
ThreadID
tid,
Addr
instPC)
override
;
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private
:
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BTBEntry
*
findEntry
(
Addr
instPC,
ThreadID
tid);
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AssociativeCache<BTBEntry>
btb
;
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};
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}
// namespace gem5::branch_prediction
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#endif
// __CPU_PRED_SIMPLE_BTB_HH__
associative_cache.hh
types.hh
Defines global host-dependent types: Counter, Tick, and (indirectly) {int,uint}{8,...
btb.hh
btb_entry.hh
Declaration of a BTB entry and BTB indexing policy.
gem5::AssociativeCache
Definition
associative_cache.hh:62
gem5::Clocked::update
void update() const
Align cycle and tick to the next clock edge if not already done.
Definition
clocked_object.hh:79
gem5::PCStateBase
Definition
pcstate.hh:59
gem5::RefCountingPtr< StaticInst >
gem5::branch_prediction::BTBEntry
Definition
btb_entry.hh:146
gem5::branch_prediction::BranchTargetBuffer
Definition
btb.hh:59
gem5::branch_prediction::BranchTargetBuffer::BranchType
enums::BranchType BranchType
Definition
btb.hh:62
gem5::branch_prediction::SimpleBTB
Definition
simple_btb.hh:57
gem5::branch_prediction::SimpleBTB::valid
bool valid(ThreadID tid, Addr instPC) override
Checks if a branch address is in the BTB.
Definition
simple_btb.cc:76
gem5::branch_prediction::SimpleBTB::lookup
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
gem5::branch_prediction::SimpleBTB::memInvalidate
void memInvalidate() override
Invalidate the contents of memory buffers.
Definition
simple_btb.cc:64
gem5::branch_prediction::SimpleBTB::findEntry
BTBEntry * findEntry(Addr instPC, ThreadID tid)
Internal call to find an address in the BTB.
Definition
simple_btb.cc:70
gem5::branch_prediction::SimpleBTB::getInst
const StaticInstPtr getInst(ThreadID tid, Addr instPC) override
Looks up an address in the BTB and return the instruction information if existant.
Definition
simple_btb.cc:102
gem5::branch_prediction::SimpleBTB::btb
AssociativeCache< BTBEntry > btb
The actual BTB.
Definition
simple_btb.hh:79
gem5::SimObject::params
const Params & params() const
Definition
sim_object.hh:176
logging.hh
base.hh
Declaration of a common framework for indexing policies.
gem5::X86ISA::type
type
Definition
misc.hh:762
gem5::branch_prediction
Definition
2bit_local.cc:52
gem5::ThreadID
int16_t ThreadID
Thread index/ID type.
Definition
types.hh:235
gem5::Addr
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition
types.hh:147
replaceable_entry.hh
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