[LLVMdev] Is it necessary to implement the whole backend in order to add a new "pass" to the backend ?

[sachin arora]

Hello all,

I am new to llvm. I need to make some changes to the LR. The backend should
modify the LR, but only after all the normal work and all the optimizations
are done.
Just before outputting the native code, LR is modified. I was wondering if
I should implement the whole backend in order to achieve this or is it
possible to implement a new pass and use that. Thanks !

Regards,
Sachin
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