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Can anyone provide experience or pointers in writing a LLVM backend? I tinkered with making an AVR backend but LLVM was rather new and had little examples to go by at the time. I would like to give it another shot!

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There's some excellent official documentation on backend writing (http://llvm.org/docs/subsystems.html and http://llvm.org/docs/WritingAnLLVMBackend.html). From my previous experience, it isn't as straightforward as in the docs, but you can use the other backends as reference.

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