Cache the fairly expensive last split point computation and provide a fast

inlined path for the common case.

Most basic blocks don't contain a call that may throw, so the last split point
os simply the first terminator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128874 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineBasicBlock.h b/include/llvm/CodeGen/MachineBasicBlock.h
index 5a6581c..ad12157 100644
--- a/include/llvm/CodeGen/MachineBasicBlock.h
+++ b/include/llvm/CodeGen/MachineBasicBlock.h
@@ -305,6 +305,10 @@ public:
   /// it returns end()
   iterator getFirstTerminator();
 
+  const_iterator getFirstTerminator() const {
+    return const_cast<MachineBasicBlock*>(this)->getFirstTerminator();
+  }
+
   /// getLastNonDebugInstr - returns an iterator to the last non-debug
   /// instruction in the basic block, or end()
   iterator getLastNonDebugInstr();