ComputerOrganizationAssignment

Custom Instructions

Opcode	Instruction	Semantics	Syntax	Type
10100	Reverse Subraction	Performs reg1 = reg3 - reg2. In case reg2 > reg3, 0 is written to reg1 and overflow flag is set.	rsb reg1 reg2 reg3	A
10110	Decrement by Imm	Performs reg1 = reg1 - Imm	dec reg1 $Imm	B
10011	Increment by Imm	Performs reg1 = reg1 + Imm	inc reg1 $Imm	B
10111	Compares the register with Imm	Compares reg1 and Imm, sets up the FLAGS register.	cmn reg1 $Imm	B
10101	Swap the data in register and memory	Performs reg1,mem_addr = mem_addr, reg1	swp reg1 mem_addr	D