const TargetRegisterInfo* tri_;
const TargetInstrInfo* tii_;
LiveIntervals *li_;
- LiveVariables *lv_;
const MachineLoopInfo* loopInfo;
BitVector allocatableRegs_;
bool RemoveCopyByCommutingDef(LiveInterval &IntA, LiveInterval &IntB,
MachineInstr *CopyMI);
- /// isBackEdgeCopy - Returns true if CopyMI is a back edge copy.
+ /// TurnCopyIntoImpDef - If source of the specified copy is an implicit def,
+ /// turn the copy into an implicit def.
+ bool TurnCopyIntoImpDef(MachineBasicBlock::iterator &I,
+ MachineBasicBlock *MBB,
+ unsigned DstReg, unsigned SrcReg);
+
+ /// CanCoalesceWithImpDef - Returns true if the specified copy instruction
+ /// from an implicit def to another register can be coalesced away.
+ bool CanCoalesceWithImpDef(MachineInstr *CopyMI,
+ LiveInterval &li, LiveInterval &ImpLi) const;
+
+ /// RemoveCopiesFromValNo - The specified value# is defined by an implicit
+ /// def and it is being removed. Turn all copies from this value# into
+ /// identity copies so they will be removed.
+ void RemoveCopiesFromValNo(LiveInterval &li, VNInfo *VNI);
+
+ /// RangeIsDefinedByCopyFromReg - Return true if the specified live range of
+ /// the specified live interval is defined by a copy from the specified
+ /// register.
+ bool RangeIsDefinedByCopyFromReg(LiveInterval &li, LiveRange *LR,
+ unsigned Reg);
+
+ /// isBackEdgeCopy - Return true if CopyMI is a back edge copy.
///
- bool isBackEdgeCopy(MachineInstr *CopyMI, unsigned DstReg);
+ bool isBackEdgeCopy(MachineInstr *CopyMI, unsigned DstReg) const;
/// UpdateRegDefsUses - Replace all defs and uses of SrcReg to DstReg and
/// update the subregister number if it is not zero. If DstReg is a
/// subregister.
void UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg, unsigned SubIdx);
+ /// RemoveDeadImpDef - Remove implicit_def instructions which are
+ /// "re-defining" registers due to insert_subreg coalescing. e.g.
+ void RemoveDeadImpDef(unsigned Reg, LiveInterval &LI);
+
+ /// RemoveUnnecessaryKills - Remove kill markers that are no longer accurate
+ /// due to live range lengthening as the result of coalescing.
+ void RemoveUnnecessaryKills(unsigned Reg, LiveInterval &LI);
+
+ /// ShortenDeadCopyLiveRange - Shorten a live range defined by a dead copy.
+ /// Return true if live interval is removed.
+ bool ShortenDeadCopyLiveRange(LiveInterval &li, MachineInstr *CopyMI);
+
/// ShortenDeadCopyLiveRange - Shorten a live range as it's artificially
/// extended by a dead copy. Mark the last use (if any) of the val# as kill
/// as ends the live range there. If there isn't another use, then this
- /// live range is dead.
- void ShortenDeadCopyLiveRange(LiveInterval &li, MachineInstr *CopyMI);
+ /// live range is dead. Return true if live interval is removed.
+ bool ShortenDeadCopySrcLiveRange(LiveInterval &li, MachineInstr *CopyMI);
/// lastRegisterUse - Returns the last use of the specific register between
/// cycles Start and End or NULL if there are no uses.