Add r4 3意思

"add r4 3" is not a valid instruction in any common programming language or assembly language I am aware of. It could be a made-up instruction or a typo. If you are referring to assembly language, the meaning of an instruction depends on the architecture of the processor. For example, if you are talking about x86 architecture, "add" usually means add two numbers, but the exact meaning depends on the operands. If you provide more context or specify the architecture, I can give you a more accurate answer.