RAM store binary numbers and bubble sort in assembly language

Question

I have to do a routine using ARM v7 that store in RAM memory 10 binary numbers and then sort these numbers from high to low using bubble sort, how should I start?

Answer 1

.func
bubbleSortAscendingU32:
    ldr     r3, [r0], #4
    mov     r1, #9*4
    mov     r12, #9*4
1:
    ldr     r2, [r0], #4
    cmp     r2, r3
    strdlo  r2, r3, [r0, #-8]
    movhi   r3, r2
    subs    r12, r12, #4
    bgt     1b

    sub     r0, r0, r1
    subs    r1, r1, #4
    ldrgt   r3, [r0, #-4]
    movgt   r12, r1
    bgt     1b

    bx      lr
.endfunc

Assuming we are dealing with an array of uint32_t, that above might work.

both strdlo and movhi have to be replaced for other types:

Unsigned Descending: strdhi and movlo

Signed Ascending: strdlt and movgt

Signed Descending: strdgt and movlt

The function prototype:

void bubbleSortAscendingU32(uint32_t *pSrc);

void bubbleSortDescendingU32(uint32_t *pSrc);

void bubbleSortAscendingS32(int32_t *pSrc);

void bubbleSortDescendingS32(int32_t *pSrc);

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• Do not ask me for details. I'd have to write half a book for the explanations. Follow the instructions step by step until you finally understand the flow.
• Your professor will most probably need quite some time until he understands the routine above.
• I doubt he will believe that you wrote this by yourself. Be honest.