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cpu: add BTBUpdates for BPredUnitStats

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Current BPredUnitStats only contains BTBLookups. However, the number
of BTB updates is also needed to evaluate power consumption via McPAT.
Thus, this patch add BTBUpdates for BPredUnitStats.

Change-Id: I4c079b53f6585b5452022fe3fb516563c7d07f4e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63651
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
This commit is contained in:
Luming Wang
2022-09-14 08:19:17 +00:00
parent e1ba253438
commit fe6fc29b07
2 changed files with 6 additions and 0 deletions
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3
src/cpu/pred/bpred_unit.cc
View File

@@ -82,6 +82,8 @@ BPredUnit::BPredUnitStats::BPredUnitStats(statistics::Group *parent)
"Number of conditional branches incorrect"),
ADD_STAT(BTBLookups, statistics::units::Count::get(),
"Number of BTB lookups"),
ADD_STAT(BTBUpdates, statistics::units::Count::get(),
"Number of BTB updates"),
ADD_STAT(BTBHits, statistics::units::Count::get(), "Number of BTB hits"),
ADD_STAT(BTBHitRatio, statistics::units::Ratio::get(), "BTB Hit Ratio",
BTBHits / BTBLookups),
@@ -479,6 +481,7 @@ BPredUnit::squash(const InstSeqNum &squashed_sn,
"PC %#x\n", tid, squashed_sn,
hist_it->seqNum, hist_it->pc);
++stats.BTBUpdates;
BTB.update(hist_it->pc, corr_target, tid);
}
} else {

3
src/cpu/pred/bpred_unit.hh
View File

@@ -191,6 +191,7 @@ class BPredUnit : public SimObject
void
BTBUpdate(Addr instPC, const PCStateBase &target)
{
++stats.BTBUpdates;
BTB.update(instPC, target, 0);
}
@@ -314,6 +315,8 @@ class BPredUnit : public SimObject
statistics::Scalar condIncorrect;
/** Stat for number of BTB lookups. */
statistics::Scalar BTBLookups;
/** Stat for number of BTB updates. */
statistics::Scalar BTBUpdates;
/** Stat for number of BTB hits. */
statistics::Scalar BTBHits;
/** Stat for the ratio between BTB hits and BTB lookups. */