//===----------------------------------------------------------------------===//
//
// This file implements the ScheduleDAG class, which is used as the common
-// base class for instruction schedulers.
+// base class for instruction schedulers. This encapsulates the scheduling DAG,
+// which is shared between SelectionDAG and MachineInstr scheduling.
//
//===----------------------------------------------------------------------===//
#define LLVM_CODEGEN_SCHEDULEDAG_H
#include "llvm/CodeGen/MachineBasicBlock.h"
-#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetLowering.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/GraphTraits.h"
class ScheduleDAG;
class SDNode;
class TargetInstrInfo;
- class TargetInstrDesc;
+ class MCInstrDesc;
class TargetMachine;
class TargetRegisterClass;
template<class Graph> class GraphWriter;
}
}
- bool operator==(const SDep &Other) const {
- if (Dep != Other.Dep || Latency != Other.Latency) return false;
+ /// Return true if the specified SDep is equivalent except for latency.
+ bool overlaps(const SDep &Other) const {
+ if (Dep != Other.Dep) return false;
switch (Dep.getInt()) {
case Data:
case Anti:
Contents.Order.isMustAlias == Other.Contents.Order.isMustAlias &&
Contents.Order.isArtificial == Other.Contents.Order.isArtificial;
}
- assert(0 && "Invalid dependency kind!");
- return false;
+ llvm_unreachable("Invalid dependency kind!");
+ }
+
+ bool operator==(const SDep &Other) const {
+ return overlaps(Other) && Latency == Other.Latency;
}
bool operator!=(const SDep &Other) const {
public:
SUnit *OrigNode; // If not this, the node from which
// this node was cloned.
+ // (SD scheduling only)
// Preds/Succs - The SUnits before/after us in the graph.
SmallVector<SDep, 4> Preds; // All sunit predecessors.
unsigned short Latency; // Node latency.
bool isVRegCycle : 1; // May use and def the same vreg.
bool isCall : 1; // Is a function call.
+ bool isCallOp : 1; // Is a function call operand.
bool isTwoAddress : 1; // Is a two-address instruction.
bool isCommutable : 1; // Is a commutable instruction.
bool hasPhysRegDefs : 1; // Has physreg defs that are being used.
bool isAvailable : 1; // True once available.
bool isScheduled : 1; // True once scheduled.
bool isScheduleHigh : 1; // True if preferable to schedule high.
+ bool isScheduleLow : 1; // True if preferable to schedule low.
bool isCloned : 1; // True if this node has been cloned.
Sched::Preference SchedulingPref; // Scheduling preference.
- SmallVector<MachineInstr*, 4> DbgInstrList; // dbg_values referencing this.
private:
bool isDepthCurrent : 1; // True if Depth is current.
bool isHeightCurrent : 1; // True if Height is current.
unsigned Depth; // Node depth.
unsigned Height; // Node height.
public:
+ unsigned TopReadyCycle; // Cycle relative to start when node is ready.
+ unsigned BotReadyCycle; // Cycle relative to end when node is ready.
+
const TargetRegisterClass *CopyDstRC; // Is a special copy node if not null.
const TargetRegisterClass *CopySrcRC;
: Node(node), Instr(0), OrigNode(0), NodeNum(nodenum),
NodeQueueId(0), NumPreds(0), NumSuccs(0), NumPredsLeft(0),
NumSuccsLeft(0), NumRegDefsLeft(0), Latency(0),
- isVRegCycle(false), isCall(false), isTwoAddress(false),
+ isVRegCycle(false), isCall(false), isCallOp(false), isTwoAddress(false),
isCommutable(false), hasPhysRegDefs(false), hasPhysRegClobbers(false),
isPending(false), isAvailable(false), isScheduled(false),
- isScheduleHigh(false), isCloned(false),
+ isScheduleHigh(false), isScheduleLow(false), isCloned(false),
SchedulingPref(Sched::None),
isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0),
- CopyDstRC(NULL), CopySrcRC(NULL) {}
+ TopReadyCycle(0), BotReadyCycle(0), CopyDstRC(NULL), CopySrcRC(NULL) {}
/// SUnit - Construct an SUnit for post-regalloc scheduling to represent
/// a MachineInstr.
: Node(0), Instr(instr), OrigNode(0), NodeNum(nodenum),
NodeQueueId(0), NumPreds(0), NumSuccs(0), NumPredsLeft(0),
NumSuccsLeft(0), NumRegDefsLeft(0), Latency(0),
- isVRegCycle(false), isCall(false), isTwoAddress(false),
+ isVRegCycle(false), isCall(false), isCallOp(false), isTwoAddress(false),
isCommutable(false), hasPhysRegDefs(false), hasPhysRegClobbers(false),
isPending(false), isAvailable(false), isScheduled(false),
- isScheduleHigh(false), isCloned(false),
+ isScheduleHigh(false), isScheduleLow(false), isCloned(false),
SchedulingPref(Sched::None),
isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0),
- CopyDstRC(NULL), CopySrcRC(NULL) {}
+ TopReadyCycle(0), BotReadyCycle(0), CopyDstRC(NULL), CopySrcRC(NULL) {}
/// SUnit - Construct a placeholder SUnit.
SUnit()
: Node(0), Instr(0), OrigNode(0), NodeNum(~0u),
NodeQueueId(0), NumPreds(0), NumSuccs(0), NumPredsLeft(0),
NumSuccsLeft(0), NumRegDefsLeft(0), Latency(0),
- isVRegCycle(false), isCall(false), isTwoAddress(false),
+ isVRegCycle(false), isCall(false), isCallOp(false), isTwoAddress(false),
isCommutable(false), hasPhysRegDefs(false), hasPhysRegClobbers(false),
isPending(false), isAvailable(false), isScheduled(false),
- isScheduleHigh(false), isCloned(false),
+ isScheduleHigh(false), isScheduleLow(false), isCloned(false),
SchedulingPref(Sched::None),
isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0),
- CopyDstRC(NULL), CopySrcRC(NULL) {}
+ TopReadyCycle(0), BotReadyCycle(0), CopyDstRC(NULL), CopySrcRC(NULL) {}
/// setNode - Assign the representative SDNode for this SUnit.
/// This may be used during pre-regalloc scheduling.
return false;
}
+ bool isTopReady() const {
+ return NumPredsLeft == 0;
+ }
+ bool isBottomReady() const {
+ return NumSuccsLeft == 0;
+ }
+
void dump(const ScheduleDAG *G) const;
void dumpAll(const ScheduleDAG *G) const;
void print(raw_ostream &O, const ScheduleDAG *G) const;
/// implementation to decide.
///
class SchedulingPriorityQueue {
+ virtual void anchor();
unsigned CurCycle;
bool HasReadyFilter;
public:
virtual void dump(ScheduleDAG *) const {}
- /// ScheduledNode - As each node is scheduled, this method is invoked. This
+ /// scheduledNode - As each node is scheduled, this method is invoked. This
/// allows the priority function to adjust the priority of related
/// unscheduled nodes, for example.
///
- virtual void ScheduledNode(SUnit *) {}
+ virtual void scheduledNode(SUnit *) {}
- virtual void UnscheduledNode(SUnit *) {}
+ virtual void unscheduledNode(SUnit *) {}
void setCurCycle(unsigned Cycle) {
CurCycle = Cycle;
class ScheduleDAG {
public:
- MachineBasicBlock *BB; // The block in which to insert instructions
- MachineBasicBlock::iterator InsertPos;// The position to insert instructions
const TargetMachine &TM; // Target processor
const TargetInstrInfo *TII; // Target instruction information
const TargetRegisterInfo *TRI; // Target processor register info
MachineFunction &MF; // Machine function
MachineRegisterInfo &MRI; // Virtual/real register map
- std::vector<SUnit*> Sequence; // The schedule. Null SUnit*'s
- // represent noop instructions.
std::vector<SUnit> SUnits; // The scheduling units.
SUnit EntrySU; // Special node for the region entry.
SUnit ExitSU; // Special node for the region exit.
+#ifdef NDEBUG
+ static const bool StressSched = false;
+#else
+ bool StressSched;
+#endif
+
explicit ScheduleDAG(MachineFunction &mf);
virtual ~ScheduleDAG();
- /// getInstrDesc - Return the TargetInstrDesc of this SUnit.
+ /// clearDAG - clear the DAG state (between regions).
+ void clearDAG();
+
+ /// getInstrDesc - Return the MCInstrDesc of this SUnit.
/// Return NULL for SDNodes without a machine opcode.
- const TargetInstrDesc *getInstrDesc(const SUnit *SU) const {
+ const MCInstrDesc *getInstrDesc(const SUnit *SU) const {
if (SU->isInstr()) return &SU->getInstr()->getDesc();
return getNodeDesc(SU->getNode());
}
/// viewGraph - Pop up a GraphViz/gv window with the ScheduleDAG rendered
/// using 'dot'.
///
+ void viewGraph(const Twine &Name, const Twine &Title);
void viewGraph();
- /// EmitSchedule - Insert MachineInstrs into the MachineBasicBlock
- /// according to the order specified in Sequence.
- ///
- virtual MachineBasicBlock *EmitSchedule() = 0;
-
- void dumpSchedule() const;
-
virtual void dumpNode(const SUnit *SU) const = 0;
/// getGraphNodeLabel - Return a label for an SUnit node in a visualization
/// of the ScheduleDAG.
virtual std::string getGraphNodeLabel(const SUnit *SU) const = 0;
+ /// getDAGLabel - Return a label for the region of code covered by the DAG.
+ virtual std::string getDAGName() const = 0;
+
/// addCustomGraphFeatures - Add custom features for a visualization of
/// the ScheduleDAG.
virtual void addCustomGraphFeatures(GraphWriter<ScheduleDAG*> &) const {}
#ifndef NDEBUG
- /// VerifySchedule - Verify that all SUnits were scheduled and that
- /// their state is consistent.
- void VerifySchedule(bool isBottomUp);
+ /// VerifyScheduledDAG - Verify that all SUnits were scheduled and that
+ /// their state is consistent. Return the number of scheduled SUnits.
+ unsigned VerifyScheduledDAG(bool isBottomUp);
#endif
protected:
- /// Run - perform scheduling.
- ///
- void Run(MachineBasicBlock *bb, MachineBasicBlock::iterator insertPos);
-
- /// BuildSchedGraph - Build SUnits and set up their Preds and Succs
- /// to form the scheduling dependency graph.
- ///
- virtual void BuildSchedGraph(AliasAnalysis *AA) = 0;
-
/// ComputeLatency - Compute node latency.
///
- virtual void ComputeLatency(SUnit *SU) = 0;
-
- /// ComputeOperandLatency - Override dependence edge latency using
- /// operand use/def information
- ///
- virtual void ComputeOperandLatency(SUnit *, SUnit *,
- SDep&) const { }
-
- /// Schedule - Order nodes according to selected style, filling
- /// in the Sequence member.
- ///
- virtual void Schedule() = 0;
+ 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; }
-
- /// EmitNoop - Emit a noop instruction.
- ///
- void EmitNoop();
-
- void EmitPhysRegCopy(SUnit *SU, DenseMap<SUnit*, unsigned> &VRBaseMap);
+ virtual bool forceUnitLatencies() const { return false; }
private:
- // Return the TargetInstrDesc of this SDNode or NULL.
- const TargetInstrDesc *getNodeDesc(const SDNode *Node) const;
+ // Return the MCInstrDesc of this SDNode or NULL.
+ const MCInstrDesc *getNodeDesc(const SDNode *Node) const;
};
class SUnitIterator : public std::iterator<std::forward_iterator_tag,
/// will create a cycle.
bool WillCreateCycle(SUnit *SU, SUnit *TargetSU);
- /// AddPred - Updates the topological ordering to accomodate an edge
+ /// AddPred - Updates the topological ordering to accommodate an edge
/// to be added from SUnit X to SUnit Y.
void AddPred(SUnit *Y, SUnit *X);
- /// RemovePred - Updates the topological ordering to accomodate an
+ /// RemovePred - Updates the topological ordering to accommodate an
/// an edge to be removed from the specified node N from the predecessors
/// of the current node M.
void RemovePred(SUnit *M, SUnit *N);
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