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authorKevin Lim <ktlim@umich.edu>2006-07-10 15:40:28 -0400
committerKevin Lim <ktlim@umich.edu>2006-07-10 15:40:28 -0400
commitfcaafdc48cc624825760cb3ba7bbc28e5db6acfa (patch)
tree16095d7881217cc548d873ab0e63d89f6a95d87c /src/cpu/o3
parent43245d9c2f3986430c1fbc4a09ee90096f6d3f30 (diff)
downloadgem5-fcaafdc48cc624825760cb3ba7bbc28e5db6acfa.tar.xz
Add parameters for backwards and forwards sizes for time buffers.
src/base/timebuf.hh: Add a function to return the size of the time buffer. --HG-- extra : convert_revision : 8ffacd8b9013eb76264df065244e00dc1460efd4
Diffstat (limited to 'src/cpu/o3')
-rw-r--r--src/cpu/o3/alpha/cpu_builder.cc12
-rw-r--r--src/cpu/o3/cpu.cc20
-rw-r--r--src/cpu/o3/iew_impl.hh5
-rwxr-xr-xsrc/cpu/o3/params.hh6
4 files changed, 26 insertions, 17 deletions
diff --git a/src/cpu/o3/alpha/cpu_builder.cc b/src/cpu/o3/alpha/cpu_builder.cc
index d61eee4b1..5e767655d 100644
--- a/src/cpu/o3/alpha/cpu_builder.cc
+++ b/src/cpu/o3/alpha/cpu_builder.cc
@@ -102,7 +102,9 @@ Param<unsigned> renameToROBDelay;
Param<unsigned> commitWidth;
Param<unsigned> squashWidth;
Param<Tick> trapLatency;
-Param<Tick> fetchTrapLatency;
+
+Param<unsigned> backComSize;
+Param<unsigned> forwardComSize;
Param<std::string> predType;
Param<unsigned> localPredictorSize;
@@ -222,7 +224,9 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(DerivO3CPU)
INIT_PARAM(commitWidth, "Commit width"),
INIT_PARAM(squashWidth, "Squash width"),
INIT_PARAM_DFLT(trapLatency, "Number of cycles before the trap is handled", 6),
- INIT_PARAM_DFLT(fetchTrapLatency, "Number of cycles before the fetch trap is handled", 12),
+
+ INIT_PARAM(backComSize, "Time buffer size for backwards communication"),
+ INIT_PARAM(forwardComSize, "Time buffer size for forward communication"),
INIT_PARAM(predType, "Type of branch predictor ('local', 'tournament')"),
INIT_PARAM(localPredictorSize, "Size of local predictor"),
@@ -350,7 +354,9 @@ CREATE_SIM_OBJECT(DerivO3CPU)
params->commitWidth = commitWidth;
params->squashWidth = squashWidth;
params->trapLatency = trapLatency;
- params->fetchTrapLatency = fetchTrapLatency;
+
+ params->backComSize = backComSize;
+ params->forwardComSize = forwardComSize;
params->predType = predType;
params->localPredictorSize = localPredictorSize;
diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index a9a1a7c9b..d53859b8b 100644
--- a/src/cpu/o3/cpu.cc
+++ b/src/cpu/o3/cpu.cc
@@ -141,15 +141,14 @@ FullO3CPU<Impl>::FullO3CPU(Params *params)
TheISA::NumMiscRegs * number_of_threads,
TheISA::ZeroReg),
- // For now just have these time buffers be pretty big.
- // @todo: Make these time buffer sizes parameters or derived
- // from latencies
- timeBuffer(5, 5),
- fetchQueue(5, 5),
- decodeQueue(5, 5),
- renameQueue(5, 5),
- iewQueue(5, 5),
- activityRec(NumStages, 10, params->activity),
+ timeBuffer(params->backComSize, params->forwardComSize),
+ fetchQueue(params->backComSize, params->forwardComSize),
+ decodeQueue(params->backComSize, params->forwardComSize),
+ renameQueue(params->backComSize, params->forwardComSize),
+ iewQueue(params->backComSize, params->forwardComSize),
+ activityRec(NumStages,
+ params->backComSize + params->forwardComSize,
+ params->activity),
globalSeqNum(1),
@@ -214,7 +213,6 @@ FullO3CPU<Impl>::FullO3CPU(Params *params)
commit.setIEWQueue(&iewQueue);
commit.setRenameQueue(&renameQueue);
- commit.setFetchStage(&fetch);
commit.setIEWStage(&iew);
rename.setIEWStage(&iew);
rename.setCommitStage(&commit);
@@ -851,7 +849,7 @@ void
FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
{
// Flush out any old data from the time buffers.
- for (int i = 0; i < 10; ++i) {
+ for (int i = 0; i < timeBuffer.getSize(); ++i) {
timeBuffer.advance();
fetchQueue.advance();
decodeQueue.advance();
diff --git a/src/cpu/o3/iew_impl.hh b/src/cpu/o3/iew_impl.hh
index 0d82645e3..684ae2295 100644
--- a/src/cpu/o3/iew_impl.hh
+++ b/src/cpu/o3/iew_impl.hh
@@ -42,8 +42,7 @@ using namespace std;
template<class Impl>
DefaultIEW<Impl>::DefaultIEW(Params *params)
- : // @todo: Make this into a parameter.
- issueToExecQueue(5, 5),
+ : issueToExecQueue(params->backComSize, params->forwardComSize),
instQueue(params),
ldstQueue(params),
fuPool(params->fuPool),
@@ -413,7 +412,7 @@ DefaultIEW<Impl>::takeOverFrom()
updateLSQNextCycle = false;
// @todo: Fix hardcoded number
- for (int i = 0; i < 6; ++i) {
+ for (int i = 0; i < issueToExecQueue.getSize(); ++i) {
issueToExecQueue.advance();
}
}
diff --git a/src/cpu/o3/params.hh b/src/cpu/o3/params.hh
index ed53fa97a..1c234bcd7 100755
--- a/src/cpu/o3/params.hh
+++ b/src/cpu/o3/params.hh
@@ -115,6 +115,12 @@ class O3Params : public BaseO3CPU::Params
Tick fetchTrapLatency;
//
+ // Timebuffer sizes
+ //
+ unsigned backComSize;
+ unsigned forwardComSize;
+
+ //
// Branch predictor (BP, BTB, RAS)
//
std::string predType;