Add a new MachineBasicBlock utility function, isLayoutSuccessor, that
can be used when deciding if a block can transfer control to another
via a fall-through instead of a branch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56968 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 0320aff..bac0a6c 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -254,6 +254,11 @@
return I != Successors.end();
}
+bool MachineBasicBlock::isLayoutSuccessor(MachineBasicBlock *MBB) const {
+ MachineFunction::const_iterator I(this);
+ return next(I) == MachineFunction::const_iterator(MBB);
+}
+
/// removeFromParent - This method unlinks 'this' from the containing function,
/// and returns it, but does not delete it.
MachineBasicBlock *MachineBasicBlock::removeFromParent() {