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318 lines
9.2 KiB
C++
318 lines
9.2 KiB
C++
//===- Target/TargetSchedInfo.h - Target Instruction Sched Info --*- C++ -*-==//
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//
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// This file describes the target machine to the instruction scheduler.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETSCHEDINFO_H
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#define LLVM_TARGET_TARGETSCHEDINFO_H
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#include "llvm/Target/TargetInstrInfo.h"
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#include "Support/hash_map"
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#include <string>
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typedef long long cycles_t;
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static const cycles_t HUGE_LATENCY = ~((long long) 1 << (sizeof(cycles_t)-2));
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static const cycles_t INVALID_LATENCY = -HUGE_LATENCY;
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static const unsigned MAX_OPCODE_SIZE = 16;
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class OpCodePair {
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public:
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long val; // make long by concatenating two opcodes
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OpCodePair(MachineOpCode op1, MachineOpCode op2)
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: val((op1 < 0 || op2 < 0)?
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-1 : (long)((((unsigned) op1) << MAX_OPCODE_SIZE) | (unsigned) op2)) {}
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bool operator==(const OpCodePair& op) const {
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return val == op.val;
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}
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private:
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OpCodePair(); // disable for now
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};
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namespace HASH_NAMESPACE {
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template <> struct hash<OpCodePair> {
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size_t operator()(const OpCodePair& pair) const {
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return hash<long>()(pair.val);
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}
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};
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}
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//---------------------------------------------------------------------------
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// class MachineResource
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// class CPUResource
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//
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// Purpose:
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// Representation of a single machine resource used in specifying
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// resource usages of machine instructions for scheduling.
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//---------------------------------------------------------------------------
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typedef unsigned resourceId_t;
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struct MachineResource {
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const std::string rname;
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resourceId_t rid;
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MachineResource(const std::string &resourceName)
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: rname(resourceName), rid(nextId++) {}
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private:
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static resourceId_t nextId;
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MachineResource(); // disable
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};
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struct CPUResource : public MachineResource {
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int maxNumUsers; // MAXINT if no restriction
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CPUResource(const std::string& rname, int maxUsers)
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: MachineResource(rname), maxNumUsers(maxUsers) {}
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};
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//---------------------------------------------------------------------------
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// struct InstrClassRUsage
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// struct InstrRUsageDelta
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// struct InstrIssueDelta
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// struct InstrRUsage
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//
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// Purpose:
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// The first three are structures used to specify machine resource
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// usages for each instruction in a machine description file:
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// InstrClassRUsage : resource usages common to all instrs. in a class
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// InstrRUsageDelta : add/delete resource usage for individual instrs.
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// InstrIssueDelta : add/delete instr. issue info for individual instrs
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//
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// The last one (InstrRUsage) is the internal representation of
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// instruction resource usage constructed from the above three.
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//---------------------------------------------------------------------------
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const int MAX_NUM_SLOTS = 32;
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const int MAX_NUM_CYCLES = 32;
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struct InstrClassRUsage {
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InstrSchedClass schedClass;
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int totCycles;
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// Issue restrictions common to instructions in this class
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unsigned maxNumIssue;
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bool isSingleIssue;
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bool breaksGroup;
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cycles_t numBubbles;
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// Feasible slots to use for instructions in this class.
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// The size of vector S[] is `numSlots'.
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unsigned numSlots;
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unsigned feasibleSlots[MAX_NUM_SLOTS];
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// Resource usages common to instructions in this class.
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// The size of vector V[] is `numRUEntries'.
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unsigned numRUEntries;
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struct {
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resourceId_t resourceId;
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unsigned startCycle;
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int numCycles;
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} V[MAX_NUM_CYCLES];
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};
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struct InstrRUsageDelta {
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MachineOpCode opCode;
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resourceId_t resourceId;
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unsigned startCycle;
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int numCycles;
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};
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// Specify instruction issue restrictions for individual instructions
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// that differ from the common rules for the class.
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//
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struct InstrIssueDelta {
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MachineOpCode opCode;
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bool isSingleIssue;
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bool breaksGroup;
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cycles_t numBubbles;
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};
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struct InstrRUsage {
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bool sameAsClass;
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// Issue restrictions for this instruction
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bool isSingleIssue;
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bool breaksGroup;
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cycles_t numBubbles;
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// Feasible slots to use for this instruction.
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std::vector<bool> feasibleSlots;
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// Resource usages for this instruction, with one resource vector per cycle.
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cycles_t numCycles;
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std::vector<std::vector<resourceId_t> > resourcesByCycle;
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private:
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// Conveniences for initializing this structure
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void setTo(const InstrClassRUsage& classRU);
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void addIssueDelta(const InstrIssueDelta& delta) {
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sameAsClass = false;
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isSingleIssue = delta.isSingleIssue;
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breaksGroup = delta.breaksGroup;
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numBubbles = delta.numBubbles;
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}
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void addUsageDelta (const InstrRUsageDelta& delta);
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void setMaxSlots (int maxNumSlots) {
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feasibleSlots.resize(maxNumSlots);
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}
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friend class TargetSchedInfo; // give access to these functions
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};
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//---------------------------------------------------------------------------
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/// TargetSchedInfo - Common interface to machine information for
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/// instruction scheduling
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///
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struct TargetSchedInfo {
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const TargetMachine& target;
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unsigned maxNumIssueTotal;
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int longestIssueConflict;
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int branchMispredictPenalty; // 4 for SPARC IIi
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int branchTargetUnknownPenalty; // 2 for SPARC IIi
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int l1DCacheMissPenalty; // 7 or 9 for SPARC IIi
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int l1ICacheMissPenalty; // ? for SPARC IIi
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bool inOrderLoads; // true for SPARC IIi
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bool inOrderIssue; // true for SPARC IIi
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bool inOrderExec; // false for most architectures
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bool inOrderRetire; // true for most architectures
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protected:
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inline const InstrRUsage& getInstrRUsage(MachineOpCode opCode) const {
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assert(opCode >= 0 && opCode < (int) instrRUsages.size());
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return instrRUsages[opCode];
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}
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const InstrClassRUsage& getClassRUsage(const InstrSchedClass& sc) const {
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assert(sc < numSchedClasses);
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return classRUsages[sc];
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}
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private:
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TargetSchedInfo(const TargetSchedInfo &); // DO NOT IMPLEMENT
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void operator=(const TargetSchedInfo &); // DO NOT IMPLEMENT
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public:
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/*ctor*/ TargetSchedInfo (const TargetMachine& tgt,
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int _numSchedClasses,
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const InstrClassRUsage* _classRUsages,
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const InstrRUsageDelta* _usageDeltas,
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const InstrIssueDelta* _issueDeltas,
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unsigned _numUsageDeltas,
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unsigned _numIssueDeltas);
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/*dtor*/ virtual ~TargetSchedInfo() {}
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inline const TargetInstrInfo& getInstrInfo() const {
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return *mii;
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}
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inline int getNumSchedClasses() const {
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return numSchedClasses;
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}
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inline unsigned getMaxNumIssueTotal() const {
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return maxNumIssueTotal;
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}
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inline unsigned getMaxIssueForClass(const InstrSchedClass& sc) const {
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assert(sc < numSchedClasses);
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return classRUsages[sc].maxNumIssue;
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}
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inline InstrSchedClass getSchedClass (MachineOpCode opCode) const {
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return getInstrInfo().getSchedClass(opCode);
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}
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inline bool instrCanUseSlot (MachineOpCode opCode,
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unsigned s) const {
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assert(s < getInstrRUsage(opCode).feasibleSlots.size() && "Invalid slot!");
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return getInstrRUsage(opCode).feasibleSlots[s];
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}
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inline int getLongestIssueConflict () const {
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return longestIssueConflict;
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}
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inline int getMinIssueGap (MachineOpCode fromOp,
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MachineOpCode toOp) const {
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assert(fromOp < (int) issueGaps.size());
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const std::vector<int>& toGaps = issueGaps[fromOp];
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return (toOp < (int) toGaps.size())? toGaps[toOp] : 0;
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}
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inline const std::vector<MachineOpCode>&
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getConflictList(MachineOpCode opCode) const {
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assert(opCode < (int) conflictLists.size());
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return conflictLists[opCode];
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}
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inline bool isSingleIssue (MachineOpCode opCode) const {
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return getInstrRUsage(opCode).isSingleIssue;
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}
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inline bool breaksIssueGroup (MachineOpCode opCode) const {
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return getInstrRUsage(opCode).breaksGroup;
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}
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inline unsigned numBubblesAfter (MachineOpCode opCode) const {
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return getInstrRUsage(opCode).numBubbles;
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}
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inline unsigned getCPUResourceNum(int rd)const{
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for(unsigned i=0;i<resourceNumVector.size();i++){
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if(resourceNumVector[i].first == rd) return resourceNumVector[i].second;
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}
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assert( 0&&"resource not found");
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return 0;
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}
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protected:
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virtual void initializeResources ();
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private:
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void computeInstrResources(const std::vector<InstrRUsage>& instrRUForClasses);
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void computeIssueGaps(const std::vector<InstrRUsage>& instrRUForClasses);
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void setGap(int gap, MachineOpCode fromOp, MachineOpCode toOp) {
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std::vector<int>& toGaps = issueGaps[fromOp];
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if (toOp >= (int) toGaps.size())
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toGaps.resize(toOp+1);
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toGaps[toOp] = gap;
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}
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public:
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std::vector<std::pair<int,int> > resourceNumVector;
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protected:
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unsigned numSchedClasses;
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const TargetInstrInfo* mii;
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const InstrClassRUsage* classRUsages; // raw array by sclass
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const InstrRUsageDelta* usageDeltas; // raw array [1:numUsageDeltas]
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const InstrIssueDelta* issueDeltas; // raw array [1:numIssueDeltas]
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unsigned numUsageDeltas;
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unsigned numIssueDeltas;
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std::vector<InstrRUsage> instrRUsages; // indexed by opcode
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std::vector<std::vector<int> > issueGaps; // indexed by [opcode1][opcode2]
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std::vector<std::vector<MachineOpCode> >
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conflictLists; // indexed by [opcode]
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friend class ModuloSchedGraph;
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friend class ModuloScheduling;
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};
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#endif
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