Question

Modify the ARMSIM program to do the following:

1) output the square sum of the data
2) output the sum of all negatives and positives separately

   .text @ Direvtive
    .global _start @ declare global begining
   _start:
LDR R1,=idx @ content of idx is length of Vec and now R1 is a counter.
LDR R1,[R1] @ R1 is now the length of Vec. read inderectly
LDR R2,=Vec @ R2 is the address of first element of vector
MOV R0,#0 @ R0 is a Register to accumolate the summation of the element of the vector.
LOOP: LDR R3,[R2] @ R3 = Vec[i]
ADD R0,R0,R3 @ R0 = R0 + Vec[i]
ADD R2,R2,#4 @ R2 pointing to the next element of vector
SUB R1,R1,#1 @ contor elemente este decrementat
CMP R1,#0 @ if counter = 0, end of Vec
BNE LOOP @ loop until R1=0
MOV R0,R0, ASR #4 @ Divding R0=SUM by 16
LDR R1,=Avg @ R1 now is the address of the Avg
STR R0,[R1] @ Inderect writing for average results in Avg
MOV R1,R0 @ Making R1 ready for print out
MOV R0,#1 @ To print out using SWI 0x6b
SWI 0x6b @ Printing the contant of R1
SWI 0x11 @ Termination
.data @ Directive for begining of data part
.align @ Directive for alagnment of memory addresses
idx: .word 16 @ Total number of elements of vector
Vec: .word -7,3,5,1 @ vector initiation
.word -3,5,-18,-10
.word 2,-1,0,6
.word -10,-9,8,2
Avg: .skip 4 @ results
.end

Answer 1

PART 1(SUM OF SQUARES )

.text                                         @ Direvtive
.global _start                          @ declare global begining
   _start:
LDR R1,=idx                           @ content of idx is the length of Vec and now R1 is a counter.
LDR R1,[R1]                           @ R1 is now the length of Vec. read inderectly
LDR R2,=Vec                          @ R2 is the address of first element of vector
MOV R0,#0                             @TO STORE SUM OF POSITIVE INTEGERS.[r0=0]

LOOP:

LDR R3,[R2]              @ R3 = Vec[i](r3= vec[0] initially)

MUL R3                       @R3= R3*R3

ADD R0,R0,R3                       @ R0 = R0 + (R3*R3)
ADD R2,R2,#4                        @ R2 pointing to the next element of vector
SUB R1,R1,#1                        @ contor elemente este decrementat
CMP R1,#0                             @ if counter = 0, end of Vec
BNE LOOP                             @ loop until R1=0
MOV R1 , R0

SWI 0x6b                                @ Printing the content of R1
SWI 0x11                                @ Termination

.data                                        @ Directive for begining of data part
.align                                       @ Directive for alagnment of memory addresses
idx: .word 16                           @ Total number of elements of vector
Vec: .word -7,3,5,1                 @ vector initiation
.word -3,5,-18,-10
.word 2,-1,0,6
.word -10,-9,8,2
.end

PART 2

.text                                         @ Direvtive
.global _start                          @ declare global begining
   _start:
LDR R1,=idx                           @ content of idx is length of Vec and now R1 is a counter.
LDR R1,[R1]                           @ R1 is now the length of Vec. read inderectly
LDR R2,=Vec                          @ R2 is the address of first element of vector
MOV R0,#0                             @TO STORE SUM OF POSITIVE INTEGERS.[r0=0]

MOV R4,#0                             @TO STORE SUM OF NEGATIVE INTEGERS[r4=0]

LOOP:

LDR R3,[R2]              @ R3 = Vec[i](r3= vec[0] initially)

ITE PL                         @LOOP FOR POSITIVE AND NEGAVTIVE NUMBERS

ADDPL R0, R0, R3                 @ R0 = R0 + (R3)
ADDMI R4, R4, R3                 @ R4= R0 + (R3)

ADD R2, R2, #4                      @ R2 pointing to the next element of vector
SUB R1, R1, #1                      @ counter element decrement
CMP R1, #0                            @ if counter = 0, end of Vec
BNE LOOP                             @ loop until R1=0

MOV R1, R0

SWI 0x6b                                @ Printing the content of R1(POSITIVE SUM)

MOV R1, R4

SWI 0x6b                                @ Printing the content of R1(NEGATIVE SUM)

SWI 0x11                                @ Termination

.data                                        @ Directive for begining of data part
.align                                       @ Directive for alagnment of memory addresses
idx: .word 16                           @ Total number of elements of vector
Vec: .word -7,3,5,1                 @ vector initiation
.word -3,5,-18,-10
.word 2,-1,0,6
.word -10,-9,8,2
.end