Fix spellnig error

[oota-llvm.git] / lib / CodeGen / SimpleRegisterCoalescing.h

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h
index 543d4704d104412d1cccbf754e6219c241a6eefb..a2041ff2a0e7d4dd1cf30497905da0bd10c1b09e 100644 (file)
--- a/lib/CodeGen/SimpleRegisterCoalescing.h
+++ b/lib/CodeGen/SimpleRegisterCoalescing.h
@@ -83,7 +83,6 @@ namespace llvm {
     const TargetRegisterInfo* tri_;
     const TargetInstrInfo* tii_;
     LiveIntervals *li_;
-    LiveVariables *lv_;
     const MachineLoopInfo* loopInfo;
     
     BitVector allocatableRegs_;
@@ -190,9 +189,31 @@ namespace llvm {
     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
@@ -201,11 +222,23 @@ namespace llvm {
     /// 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.