Admin Table of Contents
- 1 What are the advantages and disadvantages of three address instruction?
- 2 What is the one address instruction?
- 3 What do you mean by instruction formats?
- 4 What is instruction formats in computer architecture?
- 5 What are characteristics of good instruction format?
- 6 What do you understand by instruction formats?
What are the advantages and disadvantages of three address instruction?
The advantage of the three-address format is that it results in short programs when evaluating arithmetic expressions. The disadvantage is that the binary-coded instructions require too many bits to specify three addresses. An example of a commercial computer that uses three-address instructions is the Cyber 170.
What is the one address instruction?
2. One Address Instructions – This use a implied ACCUMULATOR register for data manipulation. One operand is in accumulator and other is in register or memory location. Implied means that the CPU already know that one operand is in accumulator so there is no need to specify it. Expression: X = (A+B)*(C+D)
What are the merits and demerits of single address instructions?
Difference between Three-Address Instruction and One-Address Instruction:
| Three-Address Instruction | One-Address Instruction |
|---|---|
| It disadvantage i.e. three memory access is eliminated by two-address memory. | It eliminated two memory access. |
What are the 3 types of instruction format?
Computer Organization | Instruction Formats (Zero, One, Two and Three Address Instruction)
- Operation field specifies the operation to be performed like addition.
- Address field which contains the location of the operand, i.e., register or memory location.
- Mode field which specifies how operand is to be founded.
What do you mean by instruction formats?
An instruction format defines layout of bits of an instruction, in terms of its constituent parts. An instruction format must include an opcode and implicitly or explicitly, zero or more operands. Each explicit operand is referenced using one of addressing modes.
What is instruction formats in computer architecture?
Instruction Format In Computer Architecture In computer architecture , the instruction format is defined as standard machine instruction format that can be directly decoded and executed by the central processing unit ( CPU ). In other words , the instruction format defines the layout of the bits for the instruction.
What is instruction explain various types of instruction formats with example?
Instruction Format In Computer Architecture
| Instruction Format Type | Zero Address Instruction |
|---|---|
| Example | MOV R1 , R2 ADD AX , BX |
| Instruction Format Type | Three Address Instruction |
| Instruction Format | |
| Example | ADD R1 , R2 , R3 SUB R1 , R2 , R3 |
Why do we need instruction formats?
An instruction format is also defied as layout or pattern of bits in the machine instruction that directs the CPU to decode and execute the instruction. In other words , the instruction format defines the layout of the bits for the instruction.
What are characteristics of good instruction format?
All three components must be present. Each element is necessary as it contains the information about the instruction to be executed. The entire group of instructions is called an instruction set.