return 0;
}
+ /// commuteInstruction - If a target has any instructions that are commutable,
+ /// but require converting to a different instruction or making non-trivial
+ /// changes to commute them, this method can overloaded to do this. The
+ /// default implementation of this method simply swaps the first two operands
+ /// of MI and returns it.
+ ///
+ /// If a target wants to make more aggressive changes, they can construct and
+ /// return a new machine instruction. If an instruction cannot commute, it
+ /// can also return null.
+ ///
+ virtual MachineInstr *commuteInstruction(MachineInstr *MI) const;
+
/// Insert a goto (unconditional branch) sequence to TMBB, at the
/// end of MBB
virtual void insertGoto(MachineBasicBlock& MBB,