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GCC (GNU Compiler Collection) is a popular compiler because it is open source, generates high-quality code, and is portable. The emergence of various embedded systems has led to considerable interest in the portability of GCC. For GCC, a source programming language is parsed and internally transferred to the corresponding intermediate representation, RTL (Register Transfer Language). A machine description (MD)file, which describes the mapping relationships between RTL and the corresponding target assembly instructions, is provided at the stage of code generation. Therefore, GCC retargeting requires the construction of a target MD file.