![]() ![]() Three Address Instruction Expression: X = (A+B)*(C+D)Īdvantages of Zero-Address, One-Address, Two-Address and Three-Address Instructions Zero-address instructions These instructions make the creation of the program much easier but it does not mean that program will run much faster because now instructions only contain more information but each micro-operation (changing the content of the register, loading address in the address bus etc.) will be performed in one cycle only. Programs created are much short in size but number of bits per instruction increases. This has three address fields to specify a register or a memory location. For example, a three-address instruction might multiply the contents of two registers together and add the contents of a third register, storing the result in a fourth register. The instruction operates on the contents of all three operands, and the result may be stored in the same or a different location. These instructions specify three operands or addresses, which may be memory locations or registers. Here destination address can also contain an operand. Implied means that the CPU already knows that one operand is in the accumulator so there is no need to specify it. One operand is in the accumulator and the other is in the register or memory location. This uses an implied ACCUMULATOR register for data manipulation. For example, a one-address instruction might load the contents of a memory location into a register. The instruction operates on the contents of that operand, and the result may be stored in the same or a different location. These instructions specify one operand or address, which typically refers to a memory location or register. To evaluate an expression first it is converted to reverse Polish Notation i.e. Software Engineering Interview QuestionsĪ stack-based computer does not use the address field in the instruction.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Commonly Asked Data Structure Interview Questions. ![]() ![]() Top 10 algorithms in Interview Questions.Top 20 Dynamic Programming Interview Questions.Top 20 Hashing Technique based Interview Questions.Top 50 Dynamic Programming (DP) Problems.Top 20 Greedy Algorithms Interview Questions.Top 100 DSA Interview Questions Topic-wise. ![]()
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