Preprocessing implied specifiers in a pipelined processor

Abstract From the Canadian patent

An instruction decoder generates implied specifiers for certain predefined instructions, and an operand processing unit preprocess most of the implied specifiers in the same fashion as express operand specifiers. For instructions having an implied autoincrement or autodecrement of the stack pointer, an implied read or write access type is assigned to the instruction and the decode logic is configured accordingly. When an opcode is decoded and is found to have an implied write specifier, a destination operand is created for autodecrementing the stack pointer. If an opcode is decoded and found to have an implied read specifier a, source operand is created for autoincrementing the stack …