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Hi ES, From what I understand instruction parsing is divided into two parts: - Parsing an operand list (XXXAsmParser::ParseInstruction) - Turning the operand list into an actual instruction (XXXAsmParser::MatchAndEmitInstruction) The second part does the validation (e.g. how many operands, what kind, etc) while the first part only does the parsing. That's why I think in the first part you have to handle all possible operand combinations (i.e. parse the first operand, and keep parsing operands as long as...