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author | Rekai Gonzalez-Alberquilla <rekai.gonzalezalberquilla@arm.com> | 2017-02-06 11:10:06 +0000 |
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committer | Giacomo Gabrielli <giacomo.gabrielli@arm.com> | 2018-11-16 10:39:03 +0000 |
commit | 0c50a0b4fe3956f9d2e08e75d47c9cbd79bf0268 (patch) | |
tree | 7679abe2343e0504c93eb73d09635d546a211455 /src/cpu/o3/probe/simple_trace.cc | |
parent | 338a173e822298bd22741342a7b24352450afdd1 (diff) | |
download | gem5-0c50a0b4fe3956f9d2e08e75d47c9cbd79bf0268.tar.xz |
cpu: Fix the usage of const DynInstPtr
Summary: Usage of const DynInstPtr& when possible and introduction of
move operators to RefCountingPtr.
In many places, scoped references to dynamic instructions do a copy of
the DynInstPtr when a reference would do. This is detrimental to
performance. On top of that, in case there is a need for reference
tracking for debugging, the redundant copies make the process much more
painful than it already is.
Also, from the theoretical point of view, a function/method that
defines a convenience name to access an instruction should not be
considered an owner of the data, i.e., doing a copy and not a reference
is not justified.
On a related topic, C++11 introduces move semantics, and those are
useful when, for example, there is a class modelling a HW structure that
contains a list, and has a getHeadOfList function, to prevent doing a
copy to an internal variable -> update pointer, remove from the list ->
update pointer, return value making a copy to the assined variable ->
update pointer, destroy the returned value -> update pointer.
Change-Id: I3bb46c20ef23b6873b469fd22befb251ac44d2f6
Signed-off-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/13105
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Diffstat (limited to 'src/cpu/o3/probe/simple_trace.cc')
-rw-r--r-- | src/cpu/o3/probe/simple_trace.cc | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/src/cpu/o3/probe/simple_trace.cc b/src/cpu/o3/probe/simple_trace.cc index 060b4df13..4c7b676b4 100644 --- a/src/cpu/o3/probe/simple_trace.cc +++ b/src/cpu/o3/probe/simple_trace.cc @@ -42,14 +42,14 @@ #include "base/trace.hh" #include "debug/SimpleTrace.hh" -void SimpleTrace::traceCommit(const O3CPUImpl::DynInstPtr &dynInst) +void SimpleTrace::traceCommit(const O3CPUImpl::DynInstConstPtr& dynInst) { DPRINTFR(SimpleTrace, "[%s]: Commit 0x%08x %s.\n", name(), dynInst->instAddr(), dynInst->staticInst->disassemble(dynInst->instAddr())); } -void SimpleTrace::traceFetch(const O3CPUImpl::DynInstPtr &dynInst) +void SimpleTrace::traceFetch(const O3CPUImpl::DynInstConstPtr& dynInst) { DPRINTFR(SimpleTrace, "[%s]: Fetch 0x%08x %s.\n", name(), dynInst->instAddr(), @@ -58,9 +58,12 @@ void SimpleTrace::traceFetch(const O3CPUImpl::DynInstPtr &dynInst) void SimpleTrace::regProbeListeners() { - typedef ProbeListenerArg<SimpleTrace, O3CPUImpl::DynInstPtr> DynInstListener; - listeners.push_back(new DynInstListener(this, "Commit", &SimpleTrace::traceCommit)); - listeners.push_back(new DynInstListener(this, "Fetch", &SimpleTrace::traceFetch)); + typedef ProbeListenerArg<SimpleTrace, + O3CPUImpl::DynInstConstPtr> DynInstListener; + listeners.push_back(new DynInstListener(this, "Commit", + &SimpleTrace::traceCommit)); + listeners.push_back(new DynInstListener(this, "Fetch", + &SimpleTrace::traceFetch)); } SimpleTrace* |