changeset 9b559768152b in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=9b559768152b
description:
inorder: multi-issue branch resolution
Only execute (resolve) one branch per cycle because handling more than
one is
a little more complicated
diffstat:
src/cpu/inorder/resources/execution_unit.cc | 17 ++++++++++++-----
src/cpu/inorder/resources/execution_unit.hh | 3 ++-
2 files changed, 14 insertions(+), 6 deletions(-)
diffs (60 lines):
diff -r 87f4fd9a2760 -r 9b559768152b src/cpu/inorder/resources/execution_unit.cc
--- a/src/cpu/inorder/resources/execution_unit.cc Fri Feb 04 00:08:16
2011 -0500
+++ b/src/cpu/inorder/resources/execution_unit.cc Fri Feb 04 00:08:17
2011 -0500
@@ -41,7 +41,8 @@
ExecutionUnit::ExecutionUnit(string res_name, int res_id, int res_width,
int res_latency, InOrderCPU *_cpu,
ThePipeline::Params *params)
- : Resource(res_name, res_id, res_width, res_latency, _cpu)
+ : Resource(res_name, res_id, res_width, res_latency, _cpu),
+ lastExecuteTick(0), lastControlTick(0)
{ }
void
@@ -55,8 +56,6 @@
.name(name() + ".predictedNotTakenIncorrect")
.desc("Number of Branches Incorrectly Predicted As Not Taken).");
- lastExecuteCycle = curTick();
-
executions
.name(name() + ".executions")
.desc("Number of Instructions Executed.");
@@ -98,14 +97,22 @@
{
case ExecuteInst:
{
- if (curTick() != lastExecuteCycle) {
- lastExecuteCycle = curTick();
+ if (curTick() != lastExecuteTick) {
+ lastExecuteTick = curTick();
}
if (inst->isMemRef()) {
panic("%s not configured to handle memory ops.\n", resName);
} else if (inst->isControl()) {
+ if (lastControlTick == curTick()) {
+ DPRINTF(InOrderExecute, "Can not Execute More than One
Control "
+ "Inst Per Cycle. Blocking Request.\n");
+ exec_req->done(false);
+ return;
+ }
+ lastControlTick = curTick();
+
// Evaluate Branch
fault = inst->execute();
executions++;
diff -r 87f4fd9a2760 -r 9b559768152b src/cpu/inorder/resources/execution_unit.hh
--- a/src/cpu/inorder/resources/execution_unit.hh Fri Feb 04 00:08:16
2011 -0500
+++ b/src/cpu/inorder/resources/execution_unit.hh Fri Feb 04 00:08:17
2011 -0500
@@ -74,7 +74,8 @@
Stats::Scalar predictedCorrect;
Stats::Formula mispredictPct;
Stats::Scalar executions;
- Tick lastExecuteCycle;
+ Tick lastExecuteTick;
+ Tick lastControlTick;
};
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