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Write a program in ARM assembly language that copies each element of array A to consecutive...

  1. Write a program in ARM assembly language that copies each element of array A to consecutive fourth elements of array B, i.e., A[0] to B[0], A[1] to B[3], A[2] to B[7], etc. The array A is 12 elements long, and each element is a number that is 32 bits (1 word) wide. Assume the base address of array A is in register R2, and the base address of array B is in R3.

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Answer #1

The required program snippet for the above operation in ARM assembly with R2 as base address of array A snd R3 as base address of array B is as below.

MOV R4,#0 ; initialise loop counter

LOOP LDR R5,[R2],#4 ;load the word content 32bit array A element to R5 register and post increment R2 to point to nextvelement of array A

STR R5,[R3],#16 ;Store the word content 32bit into array B element from R5 register and post increment R3 to point to next 4th consicutive element of array B

ADD R4,R4,#1 ; increment loop counter

CMP R4,#12 ; checking condition for 12 elements

BNE LOOP ; repeats loop for 12 times till r4 is 12

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