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misched: remove forceUnitLatencies. Defaults are handled by the default SchedModel

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165417 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-10-08 18:53:57 +00:00
parent 30c6ec2199
commit a98f600a64
3 changed files with 28 additions and 38 deletions
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5
include/llvm/CodeGen/ScheduleDAG.h
View File

@ -575,11 +575,6 @@ namespace llvm {
///
virtual void computeLatency(SUnit *SU) = 0;
/// ForceUnitLatencies - Return true if all scheduling edges should be given
/// a latency value of one. The default is to return false; schedulers may
/// override this as needed.
virtual bool forceUnitLatencies() const { return false; }
private:
// Return the MCInstrDesc of this SDNode or NULL.
const MCInstrDesc *getNodeDesc(const SDNode *Node) const;

55
lib/CodeGen/ScheduleDAGInstrs.cpp
View File

@ -46,8 +46,8 @@ ScheduleDAGInstrs::ScheduleDAGInstrs(MachineFunction &mf,
LiveIntervals *lis)
: ScheduleDAG(mf), MLI(mli), MDT(mdt), MFI(mf.getFrameInfo()),
InstrItins(mf.getTarget().getInstrItineraryData()), LIS(lis),
IsPostRA(IsPostRAFlag), UnitLatencies(false), CanHandleTerminators(false),
LoopRegs(MDT), FirstDbgValue(0) {
IsPostRA(IsPostRAFlag), CanHandleTerminators(false), LoopRegs(MDT),
FirstDbgValue(0) {
assert((IsPostRA || LIS) && "PreRA scheduling requires LiveIntervals");
DbgValues.clear();
assert(!(IsPostRA && MRI.getNumVirtRegs()) &&
@ -177,9 +177,6 @@ void ScheduleDAGInstrs::enterRegion(MachineBasicBlock *bb,
EndIndex = endcount;
MISUnitMap.clear();
// Check to see if the scheduler cares about latencies.
UnitLatencies = forceUnitLatencies();
ScheduleDAG::clearDAG();
}
@ -261,8 +258,7 @@ void ScheduleDAGInstrs::addPhysRegDataDeps(SUnit *SU, unsigned OperIdx) {
// TODO: Perhaps we should get rid of
// SpecialAddressLatency and just move this into
// adjustSchedDependency for the targets that care about it.
if (SpecialAddressLatency != 0 && !UnitLatencies &&
UseSU != &ExitSU) {
if (SpecialAddressLatency != 0 && UseSU != &ExitSU) {
const MCInstrDesc &UseMCID = UseMI->getDesc();
int RegUseIndex = UseMI->findRegisterUseOperandIdx(*Alias);
assert(RegUseIndex >= 0 && "UseMI doesn't use register!");
@ -276,17 +272,15 @@ void ScheduleDAGInstrs::addPhysRegDataDeps(SUnit *SU, unsigned OperIdx) {
// information (if any), and then allow the target to
// perform its own adjustments.
SDep dep(SU, SDep::Data, LDataLatency, *Alias);
if (!UnitLatencies) {
MachineInstr *RegUse = UseOp < 0 ? 0 : UseMI;
dep.setLatency(
SchedModel.computeOperandLatency(SU->getInstr(), OperIdx,
RegUse, UseOp, /*FindMin=*/false));
dep.setMinLatency(
SchedModel.computeOperandLatency(SU->getInstr(), OperIdx,
RegUse, UseOp, /*FindMin=*/true));
MachineInstr *RegUse = UseOp < 0 ? 0 : UseMI;
dep.setLatency(
SchedModel.computeOperandLatency(SU->getInstr(), OperIdx,
RegUse, UseOp, /*FindMin=*/false));
dep.setMinLatency(
SchedModel.computeOperandLatency(SU->getInstr(), OperIdx,
RegUse, UseOp, /*FindMin=*/true));
ST.adjustSchedDependency(SU, UseSU, dep);
}
ST.adjustSchedDependency(SU, UseSU, dep);
UseSU->addPred(dep);
}
}
@ -344,7 +338,7 @@ void ScheduleDAGInstrs::addPhysRegDeps(SUnit *SU, unsigned OperIdx) {
// If a def is going to wrap back around to the top of the loop,
// backschedule it.
if (!UnitLatencies && DefList.empty()) {
if (DefList.empty()) {
LoopDependencies::LoopDeps::iterator I = LoopRegs.Deps.find(MO.getReg());
if (I != LoopRegs.Deps.end()) {
const MachineOperand *UseMO = I->second.first;
@ -474,18 +468,16 @@ void ScheduleDAGInstrs::addVRegUseDeps(SUnit *SU, unsigned OperIdx) {
//
// TODO: Handle "special" address latencies cleanly.
SDep dep(DefSU, SDep::Data, DefSU->Latency, Reg);
if (!UnitLatencies) {
// Adjust the dependence latency using operand def/use information, then
// allow the target to perform its own adjustments.
int DefOp = Def->findRegisterDefOperandIdx(Reg);
dep.setLatency(
SchedModel.computeOperandLatency(Def, DefOp, MI, OperIdx, false));
dep.setMinLatency(
SchedModel.computeOperandLatency(Def, DefOp, MI, OperIdx, true));
// Adjust the dependence latency using operand def/use information, then
// allow the target to perform its own adjustments.
int DefOp = Def->findRegisterDefOperandIdx(Reg);
dep.setLatency(
SchedModel.computeOperandLatency(Def, DefOp, MI, OperIdx, false));
dep.setMinLatency(
SchedModel.computeOperandLatency(Def, DefOp, MI, OperIdx, true));
const TargetSubtargetInfo &ST = TM.getSubtarget<TargetSubtargetInfo>();
ST.adjustSchedDependency(DefSU, SU, const_cast<SDep &>(dep));
}
const TargetSubtargetInfo &ST = TM.getSubtarget<TargetSubtargetInfo>();
ST.adjustSchedDependency(DefSU, SU, const_cast<SDep &>(dep));
SU->addPred(dep);
}
}
@ -730,10 +722,7 @@ void ScheduleDAGInstrs::initSUnits() {
SU->isCommutable = MI->isCommutable();
// Assign the Latency field of SU using target-provided information.
if (UnitLatencies)
SU->Latency = 1;
else
computeLatency(SU);
computeLatency(SU);
}
}

6
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h
View File

@ -158,6 +158,12 @@ namespace llvm {
void InitNodeNumDefs();
};
protected:
/// ForceUnitLatencies - Return true if all scheduling edges should be given
/// a latency value of one. The default is to return false; schedulers may
/// override this as needed.
virtual bool forceUnitLatencies() const { return false; }
private:
/// ClusterNeighboringLoads - Cluster loads from "near" addresses into
/// combined SUnits.