Question

if statement translation

Using ARM assembly language, initialize the variables a, b, and c to consecutive integers starting at 1. Create your code so that a is in R0, b is in R1, and c is in R2.

Build the following if statements, using the ARM Cortex-M0 instructions, in sequence in your code. Please put both if statement implementations in one file.

Send me your .s file for grading.

if a == 1
b = b * 4 + 2

if a <= b
b = c + 4

return b // make sure the return value ends up in R0

Answer 1

Solution ::

MOV R0, #1; R0 is a Assigning the value 1 to R0(c)

MOV R1, #2; R1 is b Assigning the value 2 to R1(c)

MOV R3, #3; R2 is c Assigning the value 3 to R2(c)

CMP R0, #1 Comparing the values of R0(a) and 1

BEQ isEqual Checking if R0 is equal to 1   

MLA R0, R0, #4, #2 Multiply R0(a) and 4 and add it to 2, store the value in R0(a)

CMP R0, R1 Comparing R0(a) and R1(b)

BLE.R0 Checking if R0<=R1

ADD R1, R2, #4 Adding R2(c) and 4, storing the value in R1(b)

MOV R0, R1 I am assigning the value of R1(b) to R1(a), so that value gets returned in R0

RET R0

Thank you::::