Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following statements about 3 address instructions, is correct?

Which of the following statements about 3 address instructions, is correct? Correct Answer Two space for address of operand and a space for address of operation code

The correct answer is option 1.

Concept:

Three-address instruction:

Three-address instruction is a machine instruction format. It has three address fields and one opcode. There is one address field for the destination and two address fields for the source. It has two spaces for the address of operand and space for the address of operation code.

This is a common occurrence in commercial computers. In this case, the instruction can specify two addresses. Unlike earlier, when the result of a single address instruction was stored in an accumulator, the result here can be stored in a different location rather than just an accumulator, but it requires a greater number of bits to represent the address.

+ M
ADD R2, Z, W      R2 <- M + M
MUL X, R1, R2     M <- R1 x R2 

Features:

  • Three-address instruction has four fields.
  • It has one field for opcode and three fields for address.
  • In 3-address format, the destination address can not contain operand.
  • There are distinct address fields for destination and source.

Hence the correct answer is two spaces for the address of operand and space for the address of operation code.

Related Questions

Consider the following code sequence having five instructions I1 to I5. Each of these instructions has the following format. OP Ri, Rj, Rk Where operation OP is performed on contents of registers Rj and Rk and the result is stored in register Ri I1: ADD R1, R2, R3 I2: MUL R7, R1, R3 I3: SUB R4, R1, R5 I4: ADD R3, R2, R4 I5: MUL R7, R8, R9 Consider the following three statements. S1: There is an anti-dependence between instructions I2 and I5 S2: There is an anti-dependence between instructions I2 and I4 S3: Within an instruction pipeline an anti-dependence always creates one or more stalls Which one of the above statements is/are correct?
Which of the following statements is/are correct? 1. An address generated by the CPU is commonly referred to as a physical address. 2. An address seen by the memory unit is commonly referred to as a logical address. 3. The run-time mapping from virtual to physical address is done by the memory management unit (MMU). Select the correct answer using the code given below.
Which two statements describe the IP address 10.16.3.65/23?
1. The subnet address is 10.16.3.0 255.255.254.0.
2. The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
3. The last valid host address in the subnet is 10.16.2.254 255.255.254.0.
4. The broadcast address of the subnet is 10.16.3.255 255.255.254.0.
On a non-pipelined sequential processor, a program segment, which is a part of the interrupt service routine, is given to transfer 500 bytes from an I/O device to memory.     Initialize the address register     Initialize the count to 500 LOOP: Load a byte from device     Store in memory at address given by address register     Increment the address register     Decrement the count     If count! = 0 go to LOOP Assume that each statement in this program is equivalent to a machine instruction which takes one clock cycle to execute if it is a non-load/store instruction. The load-store instructions take two clock cycles to execute. The designer of the system also has an alternate approach of using the DMA controller to implement the same transfer. The DMA controller requires 20 clock cycles for initialization and other overheads. Each DMA transfer cycle takes two clock cycles to transfer one byte of data from the device to the memory. What is the approximate speedup when the DMA controller based design is used in place of the interrupt driven program based input-output?
Consider the following two statements. S1 : Destination MAC address of an ARP reply is a broadcast address. S2 : Destination MAC address of an ARP request is a broadcast address. Which one of the following choices is correct?
Which fields are contained within an IEEE Ethernet frame header?
1. Source and destination MAC address
2. Source and destination network address
3. Source and destination MAC address and source and destination network address
4. FCS field
Which statement(s) about IPv4 and IPv6 addresses are true?1. An IPv6 address is 32 bits long, represented in hexidecimal.2. An IPv6 address is 128 bits long, represented in decimal.3. An IPv4 address is 32 bits long, represented in decimal.4. An IPv6 address is 128 bits long, represented in hexidecimal.
In a class B subnet, we know the IP address of one host and the mask as given below: IP address = 125.134.112.66 Mask = 255.255.224.0 What is the first address (Network address)?
You have an IP address of 172.16.13.5 with a 255.255.255.128 subnet mask. What is your class of address, subnet address, and broadcast address?
Which of the following statements are correct? 1. The DNA Technology (Use and Application) Regulation Bill, 2019 provides for the regulation of use of DNA technology for establishing the identity of certain persons. 2. DNA is made up of 26 pairs of chromosomes and provides instructions for building an entire organism and proteins. 3. DNA is composed of two chains, which coil around each other to form a double helix carrying the genetic instructions used in the growth. 4. Under the Bill, DNA profiling is allowed only in respect of criminal matters. Select the correct answer using the code given below: