llvm dev - Jul 2021 - near data processing to an LLVM backend

Hi,
I want to extend the LLVM backend to add near data processing instruction,
how could I do it? is there a tutorial for this purpose or something? if
there is a backend with this feature please let me know.
for further detail, I have an LLVM IR that I want to select some of my
nodes to process near memory.
respectfully yours.
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