Registerregister

Registerregister is a neologism that appears in some technical writings but has no single, widely accepted definition. Depending on context, it may refer to a low-level instruction format in computer architecture or to a higher-level software design concept involving registries.

In computer architecture, register-register (often written reg-reg) describes instructions that operate on two source registers and place the result in a destination register, with no memory operand required. This contrasts with register-to-memory or immediate formats. Reg-reg operations are common in RISC architectures and many real-world ISAs support encoding for two-register operands; the exact opcode encoding and operand order vary by architecture. Typical examples include arithmetic and logical operations such as addition or bitwise AND between registers.

In software design, registerregister may denote a registry-of-registries pattern, a meta-registry that holds references to multiple subregistries. Such a structure can support modularity and plugin systems by delegating registration and lookup to the appropriate subsystems. It also raises concerns about complexity and consistency, requiring synchronization and deduplication mechanisms.

In data governance or information management, the term could describe multi-system registration workflows, where a single entity must be registered across several registries, or processes that enforce cross-reference integrity between related records.

Because registerregister is not a standardized term, its meaning is highly context-dependent and should be clarified from the surrounding documentation.