Remove val# defined by a remat'ed def that is now dead.

llvm-svn: 58294

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.h b/llvm/lib/CodeGen/SimpleRegisterCoalescing.h
index 330c476dbf5..abe392990d1 100644
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.h
+++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.h
@@ -269,6 +269,11 @@ namespace llvm {
     /// live range is dead. Return true if live interval is removed.
     bool ShortenDeadCopySrcLiveRange(LiveInterval &li, MachineInstr *CopyMI);
 
+    /// RemoveDeadDef - If a def of a live interval is now determined dead,
+    /// remove the val# it defines. If the live interval becomes empty, remove
+    /// it as well.
+    bool RemoveDeadDef(LiveInterval &li, MachineInstr *DefMI);
+
     /// lastRegisterUse - Returns the last use of the specific register between
     /// cycles Start and End or NULL if there are no uses.
     MachineOperand *lastRegisterUse(unsigned Start, unsigned End, unsigned Reg,