[llvm-dev] add new instruction format

[ComputerFreak via llvm-dev]

Hi
Im trying to add RISC V Store Instruction for an Experiment on my Target.  
The thing is, llvm Store Format gets Register and Pointer Type Operand.
beside this, RISC-V Store Instruction takes source Register, Base Register and offset immediate type. So this takes 3 leafs.  
In this case, should I make new SelectionDAG Node in this case? or use BuildMI Instruction to add new Register?  
 
P.S. if using BuildMI function to modify Instruction, is there a way to use random Register?  
because when looking some BuildMI function usage, they seem using the specific Register 
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