predecoding /ˌpriː.dɪˈkoʊ.dɪŋ/ noun1 •The process of partially decoding machine instructions prior to their storage in the instruction cache, typically to identify instruction boundaries, classify instruction types, and facilitate faster or parallel decoding during execution.It owes its simplicity to the predecoding of the I/O (input/output) slot address already provided on the Apple's main circuit board. — 1985