When extending a liveinterval by commuting, don't throw away the live ranges that...

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

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h
index fa63159d1c86b0c4a1cf2d23ac7f1c67458a67b7..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_;
@@ -232,14 +231,14 @@ namespace llvm {
     void RemoveUnnecessaryKills(unsigned Reg, LiveInterval &LI);
 
     /// ShortenDeadCopyLiveRange - Shorten a live range defined by a dead copy.
-    ///
-    void ShortenDeadCopyLiveRange(LiveInterval &li, MachineInstr *CopyMI);
+    /// 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 ShortenDeadCopySrcLiveRange(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.