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...gt; Can you help, suggest to start from? > Judging by your email, I assume you were looking at http://llvm.org/docs/WritingAnLLVMBackend.html ? If you're not familiar with compilers or LLVM, consider reading some documents and looking at some of the presentations here: http://llvm.org/docs/#llvmdesign . You can also see how other backends are implemented in LLVM: http://llvm.org/svn/llvm-project/llvm/trunk/lib/Target/ . You'll want to read about Tablegen: http://llvm.org/docs/TableGenFundamentals.html which will tell you how to write the .td files to describe your target, and then write th...