//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "post-RA-sched"
#include "llvm/CodeGen/Passes.h"
#include "AggressiveAntiDepBreaker.h"
#include "AntiDepBreaker.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
+#define DEBUG_TYPE "post-RA-sched"
+
STATISTIC(NumNoops, "Number of noops inserted");
STATISTIC(NumStalls, "Number of pipeline stalls");
STATISTIC(NumFixedAnti, "Number of fixed anti-dependencies");
}
bool runOnMachineFunction(MachineFunction &Fn) override;
+
+ bool enablePostRAScheduler(
+ const TargetSubtargetInfo &ST, CodeGenOpt::Level OptLevel,
+ TargetSubtargetInfo::AntiDepBreakMode &Mode,
+ TargetSubtargetInfo::RegClassVector &CriticalPathRCs) const;
};
char PostRAScheduler::ID = 0;
public:
SchedulePostRATDList(
- MachineFunction &MF, MachineLoopInfo &MLI, MachineDominatorTree &MDT,
- AliasAnalysis *AA, const RegisterClassInfo&,
- TargetSubtargetInfo::AntiDepBreakMode AntiDepMode,
- SmallVectorImpl<const TargetRegisterClass*> &CriticalPathRCs);
+ MachineFunction &MF, MachineLoopInfo &MLI, AliasAnalysis *AA,
+ const RegisterClassInfo &,
+ TargetSubtargetInfo::AntiDepBreakMode AntiDepMode,
+ SmallVectorImpl<const TargetRegisterClass *> &CriticalPathRCs);
- ~SchedulePostRATDList();
+ ~SchedulePostRATDList() override;
/// startBlock - Initialize register live-range state for scheduling in
/// this block.
void ReleaseSuccessors(SUnit *SU);
void ScheduleNodeTopDown(SUnit *SU, unsigned CurCycle);
void ListScheduleTopDown();
- void StartBlockForKills(MachineBasicBlock *BB);
void dumpSchedule() const;
void emitNoop(unsigned CurCycle);
"Post RA top-down list latency scheduler", false, false)
SchedulePostRATDList::SchedulePostRATDList(
- MachineFunction &MF, MachineLoopInfo &MLI, MachineDominatorTree &MDT,
- AliasAnalysis *AA, const RegisterClassInfo &RCI,
- TargetSubtargetInfo::AntiDepBreakMode AntiDepMode,
- SmallVectorImpl<const TargetRegisterClass*> &CriticalPathRCs)
- : ScheduleDAGInstrs(MF, MLI, MDT, /*IsPostRA=*/true), AA(AA), EndIndex(0) {
-
- const TargetMachine &TM = MF.getTarget();
- const InstrItineraryData *InstrItins = TM.getInstrItineraryData();
+ MachineFunction &MF, MachineLoopInfo &MLI, AliasAnalysis *AA,
+ const RegisterClassInfo &RCI,
+ TargetSubtargetInfo::AntiDepBreakMode AntiDepMode,
+ SmallVectorImpl<const TargetRegisterClass *> &CriticalPathRCs)
+ : ScheduleDAGInstrs(MF, &MLI, /*IsPostRA=*/true), AA(AA), EndIndex(0) {
+
+ const InstrItineraryData *InstrItins =
+ MF.getSubtarget().getInstrItineraryData();
HazardRec =
- TM.getInstrInfo()->CreateTargetPostRAHazardRecognizer(InstrItins, this);
+ MF.getSubtarget().getInstrInfo()->CreateTargetPostRAHazardRecognizer(
+ InstrItins, this);
assert((AntiDepMode == TargetSubtargetInfo::ANTIDEP_NONE ||
MRI.tracksLiveness()) &&
((AntiDepMode == TargetSubtargetInfo::ANTIDEP_ALL) ?
(AntiDepBreaker *)new AggressiveAntiDepBreaker(MF, RCI, CriticalPathRCs) :
((AntiDepMode == TargetSubtargetInfo::ANTIDEP_CRITICAL) ?
- (AntiDepBreaker *)new CriticalAntiDepBreaker(MF, RCI) : NULL));
+ (AntiDepBreaker *)new CriticalAntiDepBreaker(MF, RCI) : nullptr));
}
SchedulePostRATDList::~SchedulePostRATDList() {
}
#endif
+bool PostRAScheduler::enablePostRAScheduler(
+ const TargetSubtargetInfo &ST,
+ CodeGenOpt::Level OptLevel,
+ TargetSubtargetInfo::AntiDepBreakMode &Mode,
+ TargetSubtargetInfo::RegClassVector &CriticalPathRCs) const {
+ Mode = ST.getAntiDepBreakMode();
+ ST.getCriticalPathRCs(CriticalPathRCs);
+ return ST.enablePostRAScheduler() &&
+ OptLevel >= ST.getOptLevelToEnablePostRAScheduler();
+}
+
bool PostRAScheduler::runOnMachineFunction(MachineFunction &Fn) {
- TII = Fn.getTarget().getInstrInfo();
+ if (skipOptnoneFunction(*Fn.getFunction()))
+ return false;
+
+ TII = Fn.getSubtarget().getInstrInfo();
MachineLoopInfo &MLI = getAnalysis<MachineLoopInfo>();
- MachineDominatorTree &MDT = getAnalysis<MachineDominatorTree>();
AliasAnalysis *AA = &getAnalysis<AliasAnalysis>();
TargetPassConfig *PassConfig = &getAnalysis<TargetPassConfig>();
} else {
// Check that post-RA scheduling is enabled for this target.
// This may upgrade the AntiDepMode.
- const TargetSubtargetInfo &ST = Fn.getTarget().getSubtarget<TargetSubtargetInfo>();
- if (!ST.enablePostRAScheduler(PassConfig->getOptLevel(), AntiDepMode,
- CriticalPathRCs))
+ if (!enablePostRAScheduler(Fn.getSubtarget(), PassConfig->getOptLevel(),
+ AntiDepMode, CriticalPathRCs))
return false;
}
DEBUG(dbgs() << "PostRAScheduler\n");
- SchedulePostRATDList Scheduler(Fn, MLI, MDT, AA, RegClassInfo, AntiDepMode,
+ SchedulePostRATDList Scheduler(Fn, MLI, AA, RegClassInfo, AntiDepMode,
CriticalPathRCs);
// Loop over all of the basic blocks
// Reset the hazard recognizer and anti-dep breaker.
HazardRec->Reset();
- if (AntiDepBreak != NULL)
+ if (AntiDepBreak)
AntiDepBreak->StartBlock(BB);
}
// Build the scheduling graph.
buildSchedGraph(AA);
- if (AntiDepBreak != NULL) {
+ if (AntiDepBreak) {
unsigned Broken =
AntiDepBreak->BreakAntiDependencies(SUnits, RegionBegin, RegionEnd,
EndIndex, DbgValues);
/// instruction, which will not be scheduled.
///
void SchedulePostRATDList::Observe(MachineInstr *MI, unsigned Count) {
- if (AntiDepBreak != NULL)
+ if (AntiDepBreak)
AntiDepBreak->Observe(MI, Count, EndIndex);
}
/// FinishBlock - Clean up register live-range state.
///
void SchedulePostRATDList::finishBlock() {
- if (AntiDepBreak != NULL)
+ if (AntiDepBreak)
AntiDepBreak->FinishBlock();
// Call the superclass.
dbgs() << "*** Scheduling failed! ***\n";
SuccSU->dump(this);
dbgs() << " has been released too many times!\n";
- llvm_unreachable(0);
+ llvm_unreachable(nullptr);
}
#endif
--SuccSU->NumPredsLeft;
void SchedulePostRATDList::emitNoop(unsigned CurCycle) {
DEBUG(dbgs() << "*** Emitting noop in cycle " << CurCycle << '\n');
HazardRec->EmitNoop();
- Sequence.push_back(0); // NULL here means noop
+ Sequence.push_back(nullptr); // NULL here means noop
++NumNoops;
}
DEBUG(dbgs() << "\n*** Examining Available\n"; AvailableQueue.dump(this));
- SUnit *FoundSUnit = 0, *NotPreferredSUnit = 0;
+ SUnit *FoundSUnit = nullptr, *NotPreferredSUnit = nullptr;
bool HasNoopHazards = false;
while (!AvailableQueue.empty()) {
SUnit *CurSUnit = AvailableQueue.pop();
if (HT == ScheduleHazardRecognizer::NoHazard) {
if (HazardRec->ShouldPreferAnother(CurSUnit)) {
if (!NotPreferredSUnit) {
- // If this is the first non-preferred node for this cycle, then
- // record it and continue searching for a preferred node. If this
- // is not the first non-preferred node, then treat it as though
- // there had been a hazard.
+ // If this is the first non-preferred node for this cycle, then
+ // record it and continue searching for a preferred node. If this
+ // is not the first non-preferred node, then treat it as though
+ // there had been a hazard.
NotPreferredSUnit = CurSUnit;
continue;
}
AvailableQueue.push(NotPreferredSUnit);
}
- NotPreferredSUnit = 0;
+ NotPreferredSUnit = nullptr;
}
// Add the nodes that aren't ready back onto the available list.
BB->splice(++OrigPrivMI, BB, DbgValue);
}
DbgValues.clear();
- FirstDbgValue = NULL;
+ FirstDbgValue = nullptr;
}
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