Question

Convert the following C++ statements to an ARM assembly language program:

const int size = 10;

int x[size] = {8, 2, 9, 6, 7, 0, 1, 3, 5, 4};

int y[size] = {399, -87, 12, 0, 42, -367, 57, 92, -1000, 25};

for i = 0; i < size; i++)

if (x([ i ] > y[ i ])

z[ i ] = 0

else

z[ i ] = 1;

Answer 1

Answer: There are many errors in given c++ program this is a corrected one and now I given the assembly language coding for the c++ program below.

#include <iostream>

using namespace std;

int main ()
{
const int size = 10;

int x[size] = { 8, 2, 9, 6, 7, 0, 1, 3, 5, 4 };

int y[size] = { 399, -87, 12, 0, 42, -367, 57, 92, -1000, 25 };
{

for (int i = 0; i < size; i++)

if (x [i] > y[i])
{
int z[i] = {0};
  
}
   else
{
   int z[i] = {1};
  
}
  
}

   return 0;

}

Assembly language

str     fp, [sp, #-4]!

        add     fp, sp, #0

        sub     sp, sp, #12

        str     r0, [fp, #-8]

        mov     r3, #0

        mov     r0, r3

        add     sp, fp, #0

        ldr     fp, [sp], #4

        bx      lr

std::__ioinit:

.LC0:

        .word   8

        .word   2

        .word   9

        .word   6

        .word   7

        .word   0

        .word   1

        .word   3

        .word   5

        .word   4

.LC1:

        .word   399

        .word   -87

        .word   12

        .word   0

        .word   42

        .word   -367

        .word   57

        .word   92

        .word   -1000

        .word   25

main:

        push    {fp, lr}

        add     fp, sp, #4

        sub     sp, sp, #104

        mov     r3, #10

        str     r3, [fp, #-8]

        ldr     r3, .L13

        sub     ip, fp, #68

        mov     lr, r3

        ldmia   lr!, {r0, r1, r2, r3}

        stmia   ip!, {r0, r1, r2, r3}

        ldmia   lr!, {r0, r1, r2, r3}

        stmia   ip!, {r0, r1, r2, r3}

        ldm     lr, {r0, r1}

        stm     ip, {r0, r1}

        ldr     r3, .L13+4

        sub     ip, fp, #108

        mov     lr, r3

        ldmia   lr!, {r0, r1, r2, r3}

        stmia   ip!, {r0, r1, r2, r3}

        ldmia   lr!, {r0, r1, r2, r3}

        stmia   ip!, {r0, r1, r2, r3}

        ldm     lr, {r0, r1}

        stm     ip, {r0, r1}

        mov     r3, #0

        str     r3, [fp, #-12]

.L11:

        ldr     r3, [fp, #-12]

        cmp     r3, #9

        bgt     .L4

        ldr     r3, [fp, #-12]

        lsl     r3, r3, #2

        sub     r2, fp, #4

        add     r3, r2, r3

        ldr     r2, [r3, #-64]

        ldr     r3, [fp, #-12]

        lsl     r3, r3, #2

        sub     r1, fp, #4

        add     r3, r1, r3

        ldr     r3, [r3, #-104]

        cmp     r2, r3

        ble     .L5

        mov     r3, sp

        mov     lr, r3

        ldr     r3, [fp, #-12]

        sub     ip, r3, #1

        str     ip, [fp, #-24]

        mov     r3, ip

        add     r3, r3, #1

        mov     r0, r3

        mov     r1, #0

        mov     r2, #0

        mov     r3, #0

        lsl     r3, r1, #5

        orr     r3, r3, r0, lsr #27

        lsl     r2, r0, #5

        mov     r3, ip

        add     r3, r3, #1

        mov     r0, r3

        mov     r1, #0

        mov     r2, #0

        mov     r3, #0

        lsl     r3, r1, #5

        orr     r3, r3, r0, lsr #27

        lsl     r2, r0, #5

        mov     r3, ip

        add     r3, r3, #1

        lsl     r3, r3, #2

        add     r3, r3, #7

        lsr     r3, r3, #3

        lsl     r3, r3, #3

        sub     sp, sp, r3

        mov     r3, sp

        add     r3, r3, #3

        lsr     r3, r3, #2

        lsl     r3, r3, #2

        str     r3, [fp, #-28]

        ldr     r3, [fp, #-28]

        mov     r2, #0

        str     r2, [r3]

        add     r2, r3, #4

        sub     r3, ip, #1

.L7:

        cmp     r3, #0

        blt     .L6

        mov     r1, #0

        str     r1, [r2]

        add     r2, r2, #4

        sub     r3, r3, #1

        b       .L7

.L6:

        mov     sp, lr

        b       .L8

.L5:

        mov     r3, sp

        mov     lr, r3

        ldr     r3, [fp, #-12]

        sub     ip, r3, #1

        str     ip, [fp, #-16]

        mov     r3, ip

        add     r3, r3, #1

        mov     r0, r3

        mov     r1, #0

        mov     r2, #0

        mov     r3, #0

        lsl     r3, r1, #5

        orr     r3, r3, r0, lsr #27

        lsl     r2, r0, #5

        mov     r3, ip

        add     r3, r3, #1

        mov     r0, r3

        mov     r1, #0

        mov     r2, #0

        mov     r3, #0

        lsl     r3, r1, #5

        orr     r3, r3, r0, lsr #27

        lsl     r2, r0, #5

        mov     r3, ip

        add     r3, r3, #1

        lsl     r3, r3, #2

        add     r3, r3, #7

        lsr     r3, r3, #3

        lsl     r3, r3, #3

        sub     sp, sp, r3

        mov     r3, sp

        add     r3, r3, #3

        lsr     r3, r3, #2

        lsl     r3, r3, #2

        str     r3, [fp, #-20]

        ldr     r3, [fp, #-20]

        mov     r2, #1

        str     r2, [r3]

        add     r2, r3, #4

        sub     r3, ip, #1

.L10:

        cmp     r3, #0

        blt     .L9

        mov     r1, #0

        str     r1, [r2]

        add     r2, r2, #4

        sub     r3, r3, #1

        b       .L10

.L9:

        mov     sp, lr

.L8:

        ldr     r3, [fp, #-12]

        add     r3, r3, #1

        str     r3, [fp, #-12]

        b       .L11

.L4:

        mov     r3, #0

        mov     r0, r3

        sub     sp, fp, #4

        pop     {fp, lr}

        bx      lr

.L13:

        .word   .LC0

        .word   .LC1

__static_initialization_and_destruction_0(int, int):

        push    {fp, lr}

        add     fp, sp, #4

        sub     sp, sp, #8

        str     r0, [fp, #-8]

        str     r1, [fp, #-12]

        ldr     r3, [fp, #-8]

        cmp     r3, #1

        bne     .L17

        ldr     r3, [fp, #-12]

        ldr     r2, .L18

        cmp     r3, r2

        bne     .L17

        ldr     r0, .L18+4

        bl      std::ios_base::Init::Init() [complete object constructor]

        ldr     r2, .L18+8

        ldr     r1, .L18+12

        ldr     r0, .L18+4

        bl      __aeabi_atexit

.L17:

        nop

        sub     sp, fp, #4

        pop     {fp, lr}

        bx      lr

.L18:

        .word   65535

        .word   std::__ioinit

        .word   __dso_handle

        .word   _ZNSt8ios_base4InitD1Ev

_GLOBAL__sub_I_main:

        push    {fp, lr}

        add     fp, sp, #4

        ldr     r1, .L21

        mov     r0, #1

        bl      __static_initialization_and_destruction_0(int, int)

        sub     sp, fp, #4

        pop     {fp, lr}

        bx      lr

.L21:

        .word   65535