68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
//=- llvm/CodeGen/AntiDepBreaker.h - Anti-Dependence Breaking -*- C++ -*-=//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the AntiDepBreaker class, which implements
|
|
// anti-dependence breaking heuristics for post-register-allocation scheduling.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H
|
|
#define LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H
|
|
|
|
#include "llvm/CodeGen/MachineBasicBlock.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
#include "llvm/CodeGen/ScheduleDAG.h"
|
|
#include "llvm/Target/TargetRegisterInfo.h"
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
|
|
/// This class works in conjunction with the post-RA scheduler to rename
|
|
/// registers to break register anti-dependencies (WAR hazards).
|
|
class LLVM_LIBRARY_VISIBILITY AntiDepBreaker {
|
|
public:
|
|
typedef std::vector<std::pair<MachineInstr *, MachineInstr *> >
|
|
DbgValueVector;
|
|
|
|
virtual ~AntiDepBreaker();
|
|
|
|
/// Initialize anti-dep breaking for a new basic block.
|
|
virtual void StartBlock(MachineBasicBlock *BB) =0;
|
|
|
|
/// Identifiy anti-dependencies within a basic-block region and break them by
|
|
/// renaming registers. Return the number of anti-dependencies broken.
|
|
virtual unsigned BreakAntiDependencies(const std::vector<SUnit>& SUnits,
|
|
MachineBasicBlock::iterator Begin,
|
|
MachineBasicBlock::iterator End,
|
|
unsigned InsertPosIndex,
|
|
DbgValueVector &DbgValues) = 0;
|
|
|
|
/// Update liveness information to account for the current
|
|
/// instruction, which will not be scheduled.
|
|
virtual void Observe(MachineInstr &MI, unsigned Count,
|
|
unsigned InsertPosIndex) = 0;
|
|
|
|
/// Finish anti-dep breaking for a basic block.
|
|
virtual void FinishBlock() =0;
|
|
|
|
/// Update DBG_VALUE if dependency breaker is updating
|
|
/// other machine instruction to use NewReg.
|
|
void UpdateDbgValue(MachineInstr &MI, unsigned OldReg, unsigned NewReg) {
|
|
assert(MI.isDebugValue() && "MI is not DBG_VALUE!");
|
|
if (MI.getOperand(0).isReg() && MI.getOperand(0).getReg() == OldReg)
|
|
MI.getOperand(0).setReg(NewReg);
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|