Provide a function that ensures MBB numbering is dense and inorder. This

can be used by MachineFunctionPasses who need this property.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30706 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineFunction.h b/include/llvm/CodeGen/MachineFunction.h
index b06dd63922..f264c91c11 100644
--- a/include/llvm/CodeGen/MachineFunction.h
+++ b/include/llvm/CodeGen/MachineFunction.h
@@ -224,8 +224,16 @@ public:
   }
 
   /// getNumBlockIDs - Return the number of MBB ID's allocated.
+  ///
   unsigned getNumBlockIDs() const { return MBBNumbering.size(); }
   
+  /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
+  /// recomputes them.  This guarantees that the MBB numbers are sequential,
+  /// dense, and match the ordering of the blocks within the function.  If a
+  /// specific MachineBasicBlock is specified, only that block and those after
+  /// it are renumbered.
+  void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
+  
   /// print - Print out the MachineFunction in a format suitable for debugging
   /// to the specified stream.
   ///