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cpu: Implement per-thread GHRs

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Branch predictors that use GHRs should index them on a
per-thread basis.  This makes that so.

This is a re-spin of fb51231 after the revert (bd1c6789).
This commit is contained in:
Mitch Hayenga
2016-04-05 12:20:19 -05:00
parent 0fd4bb7f12
commit d99deff8ea
8 changed files with 110 additions and 108 deletions
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9
src/cpu/pred/2bit_local.cc
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@@ -78,7 +78,7 @@ LocalBP::reset()
}
void
LocalBP::btbUpdate(Addr branch_addr, void * &bp_history)
LocalBP::btbUpdate(ThreadID tid, Addr branch_addr, void * &bp_history)
{
// Place holder for a function that is called to update predictor history when
// a BTB entry is invalid or not found.
@@ -86,7 +86,7 @@ LocalBP::btbUpdate(Addr branch_addr, void * &bp_history)
bool
LocalBP::lookup(Addr branch_addr, void * &bp_history)
LocalBP::lookup(ThreadID tid, Addr branch_addr, void * &bp_history)
{
bool taken;
uint8_t counter_val;
@@ -117,7 +117,8 @@ LocalBP::lookup(Addr branch_addr, void * &bp_history)
}
void
LocalBP::update(Addr branch_addr, bool taken, void *bp_history, bool squashed)
LocalBP::update(ThreadID tid, Addr branch_addr, bool taken, void *bp_history,
bool squashed)
{
assert(bp_history == NULL);
unsigned local_predictor_idx;
@@ -152,7 +153,7 @@ LocalBP::getLocalIndex(Addr &branch_addr)
}
void
LocalBP::uncondBranch(Addr pc, void *&bp_history)
LocalBP::uncondBranch(ThreadID tid, Addr pc, void *&bp_history)
{
}