Assembly Language Programs (ALP) for an ARMv4T processor to implement following IF-ELSE statement are given below

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ANSWER ALL QUESTIONS

Lab Assignment-1

[Weightage - 10%]

 1. Assignment should be solved individually.

2. No marks will be awarded if plagiarism is detected.

3. Questions can be performed in simulation mode.

4. Please take some suitable screen shots of the KEIL IDE-in debug mode to demonstrate the desired output. Ensure that the screenshot captures system time & day.

 

Q.1. Assembly Language Programs (ALP) for an ARMv4T processor to implement following IF-ELSE statement are given below:

if ( a<b)

{

}

else

Code-1:

 x=5 y=c+d

y=c-d

 

AREA RESET, CODE, READONLY ENTRY

START

ADR R4,SRC LDR R5,=DST BL SUB1

STOP B STOP

SUB1 LDR R0,[R4],#4

LDR R1,[R4],#4 CMP R0,R1 BGE FB1 LDR R0,[R4],#4

LDR R1,[R4],#4 ADD R0,R0,R1 MOV R2,#5 STR R2,[R5],#4 STR R0,[R5]

B AFT

FB1 LDR R0,[R4],#4

 

LDR R1,[R4] SUB R0,R0,R1 STR R0,[R5,#4]

AFT MOV PC,LR

SRC DCD 0x20, 0x40, 0x30, 0x10

AREA RESULT, DATA, READWRITE DST DCD 0, 0

END

 

Code-2:

AREA RESET, CODE, READONLY ENTRY

START

ADR R4,SRC LDR R5,=DST BL SUB1

STOP B STOP

SUB1 LDR R0,[R4],#4

LDR R1,[R4],#4 CMP R0,R1 LDR R0,[R4],#4 LDR R1,[R4] MOVLT R2,#5 STRLT R2,[R5]

ADDLT R0, R0, R1 SUBGE R0, R0, R1 STR R0,[R5,#4]

 

AFT MOV PC,LR

SRC DCD 0x20, 0x40, 0x30, 0x10

AREA RESULT, DATA, READWRITE DST DCD 0, 0

END

 

 

Simulate the above given Code-1 and Code-2 using Keil uVision5 software and answer the following questions.

a) On reset what is the ARM7TDMI processor's mode of operation? [1 Mark]

b) How many states are taken for the execution of an Arithmetic instruction, Load and Store instruction respectively? [1 Mark]

c) Are the number of states taken for completion same for BGE instruction if the branch

– (1) is taken (2) not taken? [1 Mark]

d) Measure the performance of code-1 and code-2 for the following conditions [1 Mark]

Condition Code-1- States Code-2- States

a<b

a>b

a=b

 

 

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