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Fix counting of Post-RA scheduling stalls. Improve debug output. 

llvm-svn: 78843
This commit is contained in:
David Goodwin 2009-08-12 21:47:46 +00:00
parent 2f6a79cbff
commit 1f8c7a76f7
1 changed files with 25 additions and 14 deletions
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39
llvm/lib/CodeGen/PostRASchedulerList.cpp
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@ -823,6 +823,10 @@ void SchedulePostRATDList::ListScheduleTopDown() {
}
}
// In any cycle where we can't schedule any instructions, we must
// stall or emit a noop, depending on the target.
bool CycleInstCnt = 0;
// While Available queue is not empty, grab the node with the highest
// priority. If it is not ready put it back. Schedule the node.
std::vector<SUnit*> NotReady;
@ -879,6 +883,7 @@ void SchedulePostRATDList::ListScheduleTopDown() {
if (FoundSUnit) {
ScheduleNodeTopDown(FoundSUnit, CurCycle);
HazardRec->EmitInstruction(FoundSUnit);
CycleInstCnt++;
// If we are using the target-specific hazards, then don't
// advance the cycle time just because we schedule a node. If
@ -888,22 +893,28 @@ void SchedulePostRATDList::ListScheduleTopDown() {
if (FoundSUnit->Latency) // Don't increment CurCycle for pseudo-ops!
++CurCycle;
}
} else if (!HasNoopHazards) {
// Otherwise, we have a pipeline stall, but no other problem, just advance
// the current cycle and try again.
DEBUG(errs() << "*** Advancing cycle, no work to do\n");
HazardRec->AdvanceCycle();
++NumStalls;
++CurCycle;
} else {
// Otherwise, we have no instructions to issue and we have instructions
// that will fault if we don't do this right. This is the case for
// processors without pipeline interlocks and other cases.
DEBUG(errs() << "*** Emitting noop\n");
HazardRec->EmitNoop();
Sequence.push_back(0); // NULL here means noop
++NumNoops;
if (CycleInstCnt > 0) {
DEBUG(errs() << "*** Finished cycle " << CurCycle << '\n');
HazardRec->AdvanceCycle();
} else if (!HasNoopHazards) {
// Otherwise, we have a pipeline stall, but no other problem,
// just advance the current cycle and try again.
DEBUG(errs() << "*** Stall in cycle " << CurCycle << '\n');
HazardRec->AdvanceCycle();
++NumStalls;
} else {
// Otherwise, we have no instructions to issue and we have instructions
// that will fault if we don't do this right. This is the case for
// processors without pipeline interlocks and other cases.
DEBUG(errs() << "*** Emitting noop in cycle " << CurCycle << '\n');
HazardRec->EmitNoop();
Sequence.push_back(0); // NULL here means noop
++NumNoops;
}
++CurCycle;
CycleInstCnt = 0;
}
}