Recent questions tagged machine-instructions

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1

Zero Address instruction
In an 16 bit instruction the size of address field is 7 bits. The computer uses expanding opcode technique.It has 2, two address instructions and 250 one address instruction. How many Zero address instructions can be formulated ? 5120 15304 768 1024 0

asked 1 day ago in CO & Architecture by Na462 Loyal (8k points) | 4 views

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2

Calculate number of times Zero Flag is Reset
I am getting 37.

asked Jan 8 in CO & Architecture by Shubhanshu Boss (17.8k points) | 18 views

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3

Word Addressable (GATE 2004)

asked Jan 5 in CO & Architecture by Na462 Loyal (8k points) | 44 views

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4

AAI JE (IT) 2018 - Q74
How are 2 memory access required here? Only R3 contains a memory address which will be accessed for the operand.

asked Dec 13, 2018 in CO & Architecture by shaz (255 points) | 56 views

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5

RISC processor doubt
is the CPI of RISC processor always 1?

asked Dec 10, 2018 in CO & Architecture by aditi19 Active (2.2k points) | 82 views

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6

adressing modes
For Given machine instructions LW R4 #400 L1:LW R1, 0,(R4) LW R2 400(R4) ADDI R3, R1, R2 SW R3, 0(R4) SUB R4, R4, #4 BNZ R4, L1 on a 5 stage pipeline processor, 1 clock cycle per stage. how mAny clock cycles willtake execution of this segment on the regular architecture?

asked Nov 10, 2018 in CO & Architecture by rishabhdevsingh1 (83 points) | 95 views

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1 answer

7

adressing modes
Given 2 machine instructions, LW R4 #400 LW R1, 0,(R4) IN second instruction what will be loaded in R1,is it the operand at memory location 400?or some random memory location operand..I want to clarify weather value stored in register is same as adress that register points.

asked Nov 9, 2018 in CO & Architecture by rishabhdevsingh1 (83 points) | 65 views

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8

Computer Organization
Consider the following program segment used to execute on a hypothetical processor. Consider all the registers are of 16 bit size I1 MOV CX,0005 ; CX ← 0005 I2 MOV BX,OFF7H ; BX ← OFF7H I3 MOV AX,OBCAH ; AX ← OBCAH I4 OR BX,AX ; BX ← ... 4 cycles and transfer of control operations takes 2 cycles to execute. How much time is required to execute the program on a above CPU?

asked Sep 2, 2018 in CO & Architecture by Sumit Singh Chauhan Active (1.5k points) | 117 views

+2 votes

1 answer

9

Computer Organization
A computer has 256 K word memory. The instruction format has 4 fields i.e., Opcode, register field to represent one of the 60 processor registers, mode field represent one of 7 addressing modes and memory address field. How many instructions the system supports when a 32- bit instruction is placed in the one memory cell.

asked Sep 2, 2018 in CO & Architecture by Sumit Singh Chauhan Active (1.5k points) | 222 views

+3 votes

1 answer

10

Instruction Addressing
A computer has 170 different operations. Word size is 4 bytes one word instructions requires two address fields. One address for register and one address for memory. If there are 37 registers then the memory size is ______________(in KB). Ans. 256KB

asked Jul 31, 2018 in CO & Architecture by Na462 Loyal (8k points) | 221 views

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1 answer

11

RISC Instruction set
Assume that RISC processor contains 10 global registers, 10 local registers, 6 In registers and 6 Out register. It contain 4 register windows. What is the size of window and register file of the processor? Ans. 32 and 74 Please Explain the Formula and what's the meaning of Window size and register file in RISC Processor ?

asked Jul 27, 2018 in CO & Architecture by Na462 Loyal (8k points) | 142 views

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2 answers

12

Instruction Execution
Consider the 2 GHz clock frequency processor used execute the following program segment. Assume the 3 clock cycles required for Register to/from memory transfer, 1 clock cycle for ADD with both operands in register, 2 clock cycle MUL with both operands in ... for instruction fetch and decode. What is the total time required to complete the program execution (in ns)? Ans. 18

asked Jul 21, 2018 in CO & Architecture by Na462 Loyal (8k points) | 113 views

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3 answers

13

Instruction Format
Consider a computer has 64 registers and support 15 different instructions. Each instruction has 4 fields i.e. opcode, source register, destination register and immediate value of 6 bits. If each instruction in byte aligned and 50 instructions are ... answer My question is, in this question what is difference between computer has 15 instruction and memory has 50 instructions?

asked Jun 7, 2018 in CO & Architecture by srestha Veteran (106k points) | 238 views

+20 votes

4 answers

14

GATE2018-51
A processor has $16$ integer registers $(R0, R1, \ldots , R15)$ and $64$ floating point registers $(F0, F1, \ldots , F63).$ It uses a $2- byte$ instruction format. There are four categories of instructions: $Type-1, Type-2, Type-3,$ and $Type-4.$ ... $Type-4$ category consists of $N$ instructions, each with a floating point register operand $(1F).$ The maximum value of $N$ is _____

asked Feb 14, 2018 in CO & Architecture by gatecse Boss (18.3k points) | 4.6k views

+2 votes

1 answer

15

Address after Halt instruction
Consider that the memory is byte addressable with size 16 bits, and the program has been loaded starting from memory location (2000)10. What will be the return address saved in the stack, if an interrupt occurs while the CPU has been halted after executing the HALT instruction? I am getting 2018.

asked Jan 2, 2018 in CO & Architecture by Shubhanshu Boss (17.8k points) | 420 views

+2 votes

1 answer

16

Doubt in CSO
Q1) How processor knows the instruction is one word or more? Q2) Is it possible that opcode in instruction is greater than word size? Q3) What is the format of PSW and how many PSW registers are there?

asked Aug 4, 2017 in CO & Architecture by Shubhanshu Boss (17.8k points) | 374 views

+10 votes

2 answers

17

#ADDRESS INSTRUCTION
Consider the hypothetical processor is supports both 2 address and one address instructions.It has 128 word memory A 16-bit instruction is placed in the one memory word. Q1.What is the range of two address and one address instructions are supported. A)1 to ... 2-address instructions are already existed.How many one address instructions can be supported ? A)128 B)2 C)256 D)32

asked Jul 24, 2017 in CO & Architecture by junaid ahmad Loyal (9.4k points) | 1.9k views

+1 vote

1 answer

18

Machine Instructions
What is the difference between LOAD/STORE & MOVE instructions?Are they CPU - architecture dependent?

asked Jul 23, 2017 in CO & Architecture by AakS Active (1.8k points) | 446 views

+2 votes

3 answers

19

hamacher

asked Jul 21, 2017 in CO & Architecture by set2018 Loyal (8.4k points) | 274 views

0 votes

1 answer

20

carl Hamacher 6th edition Q.no 5.11
A RISC processor that uses the five-step sequence in Figure 5.4 is driven by a 1-GHz clock. Instruction statistics in a large program are as follows: Branch 20% Load 20% Store 10% Computational instructions 50% Estimate the rate of instruction ... clock cycles. On average, access to the data operands of a Load or Store instruction is completed in 3 clock cycles.

asked Jun 8, 2017 in CO & Architecture by Amit.kumar (155 points) | 258 views

+3 votes

3 answers

21

Implementation of BSA(Branch and save address) instruction
I have a doubt regarding the implementation of BSA instruction. I read that BSA instruction can be implemented as :- T4:- m[AR] <-- PC; AR<--AR+1 T5:- PC<--AR; SC<--0 Here T4 and T5 are 4th and ... to the position where PC is written. So they should happen at different clock cycles right so that they can execute in proper order?

asked Jun 7, 2017 in CO & Architecture by Xylene Active (4k points) | 875 views

+4 votes

2 answers

22

gatebook mt2 qn-36
Consider a simple in-order five-stage pipeline with a two-cycle branch misprediction penalty and a single-cycle load-use delay penalty. For a specific program, 30% of the instructions are loads, 20% are branches, the remaining 50% of instructions are ... dependent instruction, and 75% of branches are predicted correctly. What is the average CPI of this program on this processor?

asked Feb 7, 2017 in CO & Architecture by Purple Active (3.6k points) | 832 views

+4 votes

1 answer

23

gatebook mt2
A certain pipelined RISC machine has 8 general-purpose registers R0, R1, . . . , R7 and supports the following operations. ADD Rs1, Rs2, Rd /* Add Rs1 to Rs2 and put the sum in Rd */ MUL Rs1, Rs2, Rd /* Multiply Rs1 by Rs2 and put the product in Rd */ An operation ... of clock cycles required for an operation sequence that computes the value of AB + ABC + BC ? (A) 5 (B) 6 (C) 7 (D) 8

asked Feb 7, 2017 in CO & Architecture by Purple Active (3.6k points) | 531 views

+10 votes

2 answers

24

Expanding opcode technique
A CPU is designed to have 58 three-address instructions and 25 two-address instructions. The CPU is able to address a maximum of 16 memory locations. The length of machine code is the same for all instructions. If the list of the ... of twoaddress instructions iv) Determine the length of the machine code v) List the machine codes Detailed explanation would be helpful

asked Dec 10, 2016 in CO & Architecture by Prajwal Bhat Boss (11.5k points) | 3k views

+7 votes

2 answers

25

ISI2011-CS-6a
Assume a machine has 4 registers (one of which is the accumulator $A$) and the following instruction set. $LOAD$ and $STORE$ ... offset. Design an instruction encoding scheme that allows each of the above instructions (along with operands) to be encoded in 8 bits.

asked Jun 3, 2016 in CO & Architecture by jothee Veteran (112k points) | 545 views

+17 votes

2 answers

26

GATE2003-49
Consider the following assembly language program for a hypothetical processor A, B, and C are 8 bit registers. The meanings of various instructions are shown as comments. MOV B, #0 ; $B \leftarrow 0$ MOV C, #8 ; $C \leftarrow 8$ Z: CMP C, #0 ; compare C with 0 JZ ... same as its initial value? RRC A, #1 NOP ; no operation LRC A, #1; left rotate A through carry flag by one bit ADD A, #1

asked Apr 24, 2016 in CO & Architecture by jothee Veteran (112k points) | 2.2k views

+28 votes

3 answers

27

GATE2004-64
Consider the following program segment for a hypothetical CPU having three user registers R1, R2 and R3. Instruction Operation Instruction Size (in words) MOV R1, 5000 R1 $\leftarrow$ Memory[5000] 2 MOV R2, (R1) R2 $\leftarrow$ ... decode : 2 clock cycles per word The total number of clock cycles required to execute the program is $29$ $24$ $23$ $20$

asked Apr 24, 2016 in CO & Architecture by jothee Veteran (112k points) | 4.6k views

+22 votes

9 answers

28

GATE2005-80
The ALU, the bus and all the registers in the data path are of identical size. All operations including incrementation of the PC and the GPRs are to be carried out in the ALU. Two clock cycles are needed for memory read operation - the first one for loading address in ... $2$ $3$ $4$ $5$

asked Apr 24, 2016 in CO & Architecture by jothee Veteran (112k points) | 4.6k views

+20 votes

3 answers

29

GATE2007-73
Consider the following program segment. Here R1, R2 and R3 are the general purpose registers. Instruction Operation Instruction size (no. of words) MOV R1, (3000) R1 $\leftarrow$ m[3000] 2 LOOP: MOV R2, (R3) R2 $\leftarrow$ M[R3] 1 ADD R2, R1 ... during the execution of the instruction “INC R3”, what return address will be pushed on to the stack? 1005 1020 1024 1040

asked Apr 23, 2016 in CO & Architecture by jothee Veteran (112k points) | 2.6k views

+18 votes

4 answers

30

GATE2007-72
Consider the following program segment. Here $R1, R2$ and $R3$ are the general purpose registers. Instruction Operation Instruction size (no. of words) MOV $R1, (3000)$ $R1 \leftarrow m[3000]$ $2$ LOOP: MOV $R2, (R3)$ $R2 \leftarrow M[R3]$ $1$ ... the memory is word addressable. After the execution of this program, the content of memory location $2010$ is: $100$ $101$ $102$ $110$

asked Apr 23, 2016 in CO & Architecture by jothee Veteran (112k points) | 2k views

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