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I see. If I put simm16 and immSExt16x in place of uimm16 and immZExt16x respectively, the imm matches but it prints out -32768 (which is invalid for sub16u). We are using uimm16 not match unsigned but for PrintMethod, effectively uimm16 and simm16 are both Operand<i16>. I'm still unclear why simm16 matches and uimm16 does not. Here is the pattern if that helps at all. So just as a