#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.
virtual void getAnalysisUsage(AnalysisUsage &au) const;
- virtual bool runOnMachineFunction(MachineFunction &fn);
+ virtual bool runOnMachineFunction(MachineFunction &fn);
private:
/// Returns true if the given live interval is zero length.