Optimize MachineBasicBlock::getSymbol by caching the symbol. Since the symbol

[oota-llvm.git] / include / llvm / CodeGen / MachineBasicBlock.h

diff --git a/include/llvm/CodeGen/MachineBasicBlock.h b/include/llvm/CodeGen/MachineBasicBlock.h
index 492a3ff49f8c6b9c97b4be50f1330c28ffe67b46..0f2f8746b382505d0f16ba4e883f8dc313c79244 100644 (file)
--- a/include/llvm/CodeGen/MachineBasicBlock.h
+++ b/include/llvm/CodeGen/MachineBasicBlock.h
@@ -71,7 +71,6 @@ class MachineBasicBlock : public ilist_node<MachineBasicBlock> {
   std::vector<MachineBasicBlock *> Predecessors;
   std::vector<MachineBasicBlock *> Successors;
 
-
   /// Weights - Keep track of the weights to the successors. This vector
   /// has the same order as Successors, or it is empty if we don't use it
   /// (disable optimization).
@@ -96,6 +95,10 @@ class MachineBasicBlock : public ilist_node<MachineBasicBlock> {
   /// target of an indirect branch.
   bool AddressTaken;
 
+  /// \brief since getSymbol is a relatively heavy-weight operation, the symbol
+  /// is only computed once and is cached.
+  mutable MCSymbol *CachedMCSymbol;
+
   // Intrusive list support
   MachineBasicBlock() {}