Assume a 5 stage MIPS pipeline (like the one in the slides) with the following stages: FETCH DECODE EXEC MEM WB. Use the following instructions to answer the question. Assume the first (ADDI) instruction is FETCHED in clock cycle 1, the second in clock cycle 2, the third in clock cycle 3, etc. ***In what pipeline stage is the LW instruction during clock cycle 6???***

Assume a 5 stage MIPS pipeline (like the one in the slides) with the following stages: FETCH DECODE EXEC MEM WB. Use the following instructions to answer the question. Assume the first (ADDI) instruction is FETCHED in clock cycle 1, the second in clock cycle 2, the third in clock cycle 3, etc. In what pipeline stage is the LW instruction during clock cycle 6???

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question 1 Suppose you have to execute the instruction lw $s4,0x12345678. This means you have to perform a read operation on memory address 0x12345678. However, the given instruction is not following a valid format. Now write a MIPS code that can perform the same load operation as indicated in this question but avoiding the wrong instruction format.
1. Describe your answer by showing the datapath for the following MIPS instruction while the next instruction is also being fetched: Iw $s1, 112($s0)
d) Consider I have the following instructions Id addi x11, x12, 5 add x12, 16(x11) x13, x11, x12 addi x14, x11, 15 add x15, x13, x12 What is the total number of clock cycles needed to complete executing these instructions in the pipeline with forwarding hardware? Ans:
Refer to the screenshot;
Give for both the instructions
Assume a pipelined CPU with data forwarding. In the following code, suppose the ADD instruction is in the EX stage. From which buffer register of the pipeline will the ADD instruction read the value of operand X1? LDUR X1, MEM[X2, #12] SUB X1, X2, X3 ADD X3, X4, X1 Question 6 options: EX/MEM МЕМ/WB ID/EX IF/ID
clock cycle at which the first of the instructions is fetched as clock cycle 1. Assume that if one instruction reads a register during the same clock cycle as another instruction is writing it, the new value will be read. Do not reorder the instructions. Instructions are fetched and executed exactly in the order given below, with the pipeline stalling if necessary.addi $s2, $s2, 1li $s6, 5add $s1, $s2, $s3move $s5, $s6lw $t1, 0($s5)
Part (a): How do you identify the IO module issuing the interrupt? Part (b): How RISC possibly eliminated the complexity present in ISC? Part (c): If you have 5 different instructions and each instruction having 4-stages like (Fetch, Decode, Execute & Write), each stage takes 2ns of time to complete its processing? Then calculate the total time for execution using "sequential execution" and using "pipelined execution". Part (d): Suppose we have data i.e, 1100110010111010010010 Apply a.Logical right shift b.Logical left shift c.Arithmetic right shift d.Arithmetic left shift e.Left Rotate f.Right Rotate
The following sequence of instructions will execute on the 5-stage pipelined MIPS datapath: I-MEM Address Instruction OXAO L1: slt $t4, $t0, $t1 OXA4 beq $t4, $1, L2 OXA8 slt $14, $t0, $t2 OXAC beq $t4, $1, L2 OXBO slt $t4, $t0, $t3 ОхВ4 beq $t4, $1, L2 OXB8 j L3 OXBC L2: addi $t0, $t0, 5 OXCO j L1 ОХC4 L3: List data dependencies for the entire code (i.e. a->b would mean instruction b is dependent on instruction a ): Which data dependencies are hazards? How many clock cycles does it take to execute the entire code for a normal pipelined processor? (i.e. all 5 stages of the last instruction have been completed) How many clock cycles will it take for a 2-issue in-order superscalar pipelined processor to execute the entire code?
CPI stands for clock cycles per instruction. Speedup from pipelining = (Number of pipeline stages) / (Achieved CPI ). Assume a 5-stage pipeline. Assume that CPI = 1 when there are no pipeline stalls (the ideal case). Now assume that every branch instruction causes a 3 clock cycle stall in the pipeline. Assume that for the program being executed 30% of executed instructions are branch instructions. What speedup from pipelining is achieved by this program?
Answer the following questions. Consider the following program and assume that the Initial content of all the registers are zero START: MOV R1, #2 MOV R2, #1 MOV R3, #2 ADD R1,R2 SUB R1,R3 CMP R1, R2 JNZ Next (Jump if Not Zero) MOV R3, #10 Next: print "EQUAL" HLT i. Write the timing of instruction pipeline with 5 stage (Neglect all types of hazard) ii. What is the content of various registers after the execution of the program? iii. Identify the type of Hazards with above program. and also step's to avoid the hazard. iv. What is the minimum time taken to execute the program in pipelined and Non Pipelined Manner. v. What is speedup, Efficiency and Throughput for the above program and also mention the ways to improve all three parameters.
The following sequence of MIPS instructions is processed using a 5-stage pipeline, as discussed in class. What is the minimum number of clock cycles are required, from start to finish? Assume that, if necessary, only pipeline stalls (not data forwarding) can be used to prevent data hazards. lw $1,0($2) addi $3,$3,1 add $2,$1,$1 add $5,$4,$4