[LLVMdev] How to construct a new register allocation algorithm

[蜡笔小新]

There are three main register allocation strategies in the backend of LLVM. If I want to design and implement a new algorithm, how can I add it to LLVM and call it from llc just as the three options like 
llc -regalloc=fast file.bc -o fa.sllc -regalloc=new file.bc -o new.s
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