//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_CODEGEN_ANTIDEPBREAKER_H
-#define LLVM_CODEGEN_ANTIDEPBREAKER_H
+#ifndef LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H
+#define LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
namespace llvm {
-/// AntiDepBreaker - This class works into conjunction with the
-/// post-RA scheduler to rename registers to break register
-/// anti-dependencies.
-class AntiDepBreaker {
+/// 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();
- /// Start - Initialize anti-dep breaking for a new basic block.
+ /// Initialize anti-dep breaking for a new basic block.
virtual void StartBlock(MachineBasicBlock *BB) =0;
- /// BreakAntiDependencies - Identifiy anti-dependencies within a
- /// basic-block region and break them by renaming registers. Return
- /// the number of anti-dependencies broken.
- ///
+ /// 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) =0;
+ MachineBasicBlock::iterator Begin,
+ MachineBasicBlock::iterator End,
+ unsigned InsertPosIndex,
+ DbgValueVector &DbgValues) = 0;
- /// Observe - Update liveness information to account for the current
+ /// 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 - Finish anti-dep breaking for a basic block.
+ /// 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 && MI->getOperand(0).isReg() && MI->getOperand(0).getReg() == OldReg)
+ MI->getOperand(0).setReg(NewReg);
+ }
};
}