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//===- ScheduleDAGILP.h - ILP metric for ScheduleDAGInstrs ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Definition of an ILP metric for machine level instruction scheduling.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_SCHEDULEDAGILP_H
#define LLVM_CODEGEN_SCHEDULEDAGILP_H
#include "llvm/Support/DataTypes.h"
#include <vector>
namespace llvm {
class raw_ostream;
class ScheduleDAGInstrs;
class SUnit;
/// \brief Represent the ILP of the subDAG rooted at a DAG node.
struct ILPValue {
unsigned InstrCount;
unsigned Cycles;
ILPValue(): InstrCount(0), Cycles(0) {}
ILPValue(unsigned count, unsigned cycles):
InstrCount(count), Cycles(cycles) {}
bool isValid() const { return Cycles > 0; }
// Order by the ILP metric's value.
bool operator<(ILPValue RHS) const {
return (uint64_t)InstrCount * RHS.Cycles
< (uint64_t)Cycles * RHS.InstrCount;
}
bool operator>(ILPValue RHS) const {
return RHS < *this;
}
bool operator<=(ILPValue RHS) const {
return (uint64_t)InstrCount * RHS.Cycles
<= (uint64_t)Cycles * RHS.InstrCount;
}
bool operator>=(ILPValue RHS) const {
return RHS <= *this;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void print(raw_ostream &OS) const;
void dump() const;
#endif
};
/// \brief Compute the values of each DAG node for an ILP metric.
///
/// This metric assumes that the DAG is a forest of trees with roots at the
/// bottom of the schedule.
class ScheduleDAGILP {
bool IsBottomUp;
std::vector<ILPValue> ILPValues;
public:
ScheduleDAGILP(bool IsBU): IsBottomUp(IsBU) {}
/// \brief Initialize the result data with the size of the DAG.
void resize(unsigned NumSUnits);
/// \brief Compute the ILP metric for the subDAG at this root.
void computeILP(const SUnit *Root);
/// \brief Get the ILP value for a DAG node.
ILPValue getILP(const SUnit *SU);
};
raw_ostream &operator<<(raw_ostream &OS, const ILPValue &Val);
} // namespace llvm
#endif
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