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5. (15 points) Write an ARM assembly subroutine that finds the absolute value of an integer input. Follow register convention

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Answer #1
@ abs.s

/* function to find the absolute value of a number */
.global abs
abs:
    cmp r0, #0
    bge .end
    mvn r1, r0
    add r0, r1, #1
.end:
    mov pc, lr

--> abs function by using compare, branch and 2's compliment(mvn and add #1).

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