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//===---------------- lib/CodeGen/CalcSpillWeights.h ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_CALCSPILLWEIGHTS_H
#define LLVM_CODEGEN_CALCSPILLWEIGHTS_H
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/ADT/DenseMap.h"
namespace llvm {
class LiveInterval;
class LiveIntervals;
class MachineLoopInfo;
/// VirtRegAuxInfo - Calculate auxiliary information for a virtual
/// register such as its spill weight and allocation hint.
class VirtRegAuxInfo {
MachineFunction &mf_;
LiveIntervals &lis_;
const MachineLoopInfo &loops_;
DenseMap<unsigned, float> hint_;
public:
VirtRegAuxInfo(MachineFunction &mf, LiveIntervals &lis,
const MachineLoopInfo &loops) :
mf_(mf), lis_(lis), loops_(loops) {}
/// CalculateRegClass - recompute the register class for reg from its uses.
/// Since the register class can affect the allocation hint, this function
/// should be called before CalculateWeightAndHint if both are called.
void CalculateRegClass(unsigned reg);
/// CalculateWeightAndHint - (re)compute li's spill weight and allocation
/// hint.
void CalculateWeightAndHint(LiveInterval &li);
};
/// CalculateSpillWeights - Compute spill weights for all virtual register
/// live intervals.
class CalculateSpillWeights : public MachineFunctionPass {
public:
static char ID;
CalculateSpillWeights() : MachineFunctionPass(ID) {}
virtual void getAnalysisUsage(AnalysisUsage &au) const;
virtual bool runOnMachineFunction(MachineFunction &fn);
private:
/// Returns true if the given live interval is zero length.
bool isZeroLengthInterval(LiveInterval *li) const;
};
}
#endif // LLVM_CODEGEN_CALCSPILLWEIGHTS_H
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