Translate the following C++ program to assembly. Upload the .pep file here. This

Question

Translate the following C++ program to assembly. Upload the .pep file here. This program uses a recursive function to add a list of 4 integers stored in an array. The C++ source code is attached.

// Listing 2.25.cpp
// A recursive function that returns the sum
// of the first n numbers in an array

#include <iostream>
using namespace std;

int list[4];

int sum (int a[], int n){
    // Returns the sum of the elements of a between a[0] and a[n]
    if (n == 0){
        return a[0];
    }
    else{
        return a[n] + sum(a, n-1);
    }
}

int main() {
    cout << "Enter four integers: ";
    cin >> list[0] >> list[1] >> list[2] >> list[3];
    cout << "Their sum is: " << sum(list,3) << endl;
    return 0;
}

Explanation / Answer

GNU GCC C++ to Assembly Language conversion.. [NOTE - No .pep file]

Ltext0:

                          .local   _ZStL8__ioinit

                          .comm    _ZStL8__ioinit,1,1

                          .globl   list

                          .bss

                          .align 16

                 list:

                 .zero    16

    

                 .text

                          .globl   _Z3sumPii

                 _Z3sumPii:

                 .LFB971:

                          .cfi_startproc

                 pushq    %rbp

                          .cfi_def_cfa_offset 16

                          .cfi_offset 6, -16

                 movq     %rsp, %rbp

                        .cfi_def_cfa_register 6

                 pushq    %rbx

                 subq     $24, %rsp

                          .cfi_offset 3, -24

                 movq     %rdi, -24(%rbp)

                 movl     %esi, -28(%rbp)

                 cmpl     $0, -28(%rbp)

                 jne      .L2

                 movq     -24(%rbp), %rax

                 movl     (%rax), %eax

                 jmp      .L3

                 .L2:

                 movl     -28(%rbp), %eax

                 cltq

                 leaq     0(,%rax,4), %rdx

    

                 movq     -24(%rbp), %rax

                 addq     %rdx, %rax

                 movl     (%rax), %ebx

                 movl     -28(%rbp), %eax

                 leal     -1(%rax), %edx

                 movq     -24(%rbp), %rax

                 movl     %edx, %esi

                 movq     %rax, %rdi

                 call     _Z3sumPii

    

                 addl     %ebx, %eax

                 .L3:

                 addq     $24, %rsp

                 popq     %rbx

                 popq     %rbp

                          .cfi_def_cfa 7, 8

                 ret

                          .cfi_endproc

               .LFE971:

                          .section .rodata

                 .LC0:

                 .string "Enter four integers: "

                     .LC1:

                 .string "Their sum is: "

                           .text

                          .globl   main

                 main:

                 .LFB972:

                          .cfi_startproc

                 pushq    %rbp

                          .cfi_def_cfa_offset 16

                          .cfi_offset 6, -16

                 movq     %rsp, %rbp

                          .cfi_def_cfa_register 6

                 pushq    %rbx

                 subq     $8, %rsp

                          .cfi_offset 3, -24

                 movl     $.LC0, %esi

    

                 movl     $_ZSt4cout, %edi

    

                 call     _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc

                 movl     $list, %esi

                 movl     $_ZSt3cin, %edi

                 call     _ZNSirsERi

                 movl     $list+4, %esi

                 movq     %rax, %rdi

                 call     _ZNSirsERi

    

                 movl     $list+8, %esi

    

                 movq     %rax, %rdi

                 call     _ZNSirsERi

    

                 movl     $list+12, %esi

                 movq     %rax, %rdi

                 call     _ZNSirsERi

                 movl     $3, %esi

                 movl     $list, %edi

   

                 call     _Z3sumPii

    

                 movl     %eax, %ebx

                 movl     $.LC1, %esi

    

                 movl     $_ZSt4cout, %edi

    

                 call     _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc

    

                 movl     %ebx, %esi

                 movq     %rax, %rdi

                 call     _ZNSolsEi

    

                 movl     $_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, %esi

    

                 movq     %rax, %rdi

                 call     _ZNSolsEPFRSoS_E

                 movl     $0, %eax

   

                 addq     $8, %rsp

                 popq     %rbx

                 popq     %rbp

                          .cfi_def_cfa 7, 8

                 ret

                          .cfi_endproc

                 .LFE972:

                 _Z41__static_initialization_and_destruction_0ii:

                 .LFB981:

                 movl     $_ZStL8__ioinit, %edi

   

                 call     _ZNSt8ios_base4InitC1Ev

                 movl     $__dso_handle, %edx

    

                 movl     $_ZStL8__ioinit, %esi

   

                 movl     $_ZNSt8ios_base4InitD1Ev, %edi

    

                 call     __cxa_atexit

   

                          .cfi_startproc

                 pushq    %rbp

                          .cfi_def_cfa_offset 16

                          .cfi_offset 6, -16

                 movq     %rsp, %rbp

                          .cfi_def_cfa_register 6

                 subq     $16, %rsp

                 movl     %edi, -4(%rbp)

                 movl     %esi, -8(%rbp)

         cmpl     $1, -4(%rbp)

                 jne      .L6

                 cmpl     $65535, -8(%rbp)

    

                 jne      .L6

                 .L6:

                 leave

                          .cfi_def_cfa 7, 8

                 ret

                          .cfi_endproc

                 .LFE981:

                 _GLOBAL__sub_I_list:

                 .LFB982:

                          .cfi_startproc

                 pushq    %rbp

                          .cfi_def_cfa_offset 16

                          .cfi_offset 6, -16

                 movq     %rsp, %rbp

                          .cfi_def_cfa_register 6

                 movl     $65535, %esi

   

                 movl     $1, %edi

    

                 call     _Z41__static_initialization_and_destruction_0ii

    

                 popq     %rbp

                          .cfi_def_cfa 7, 8

                 ret

                          .cfi_endproc

                 .LFE982:

                          .section .init_array,"aw"

                          .align 8

                 .quad    _GLOBAL__sub_I_list

    

                          .text

                 .Letext0:

Please Rate

Thank You

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.