 main:
        push    rbp
        mov     edi, OFFSET FLAT:_ZSt3cin
        push    rbx
        sub     rsp, 440
        lea     rsi, [rsp+12]
        call    std::basic_istream<char, std::char_traits<char> >::operator>>(int&)
        movsx   rdi, DWORD PTR [rsp+12]
        test    edi, edi
        jle     .L9
        lea     rbp, [rsp+20]
        mov     ebx, 1
.L3:
        mov     rsi, rbp
        mov     edi, OFFSET FLAT:_ZSt3cin
        add     ebx, 1
        add     rbp, 4
        call    std::basic_istream<char, std::char_traits<char> >::operator>>(int&)
        movsx   rdi, DWORD PTR [rsp+12]
        cmp     edi, ebx
        jge     .L3
        mov     eax, DWORD PTR [rsp+20]
        cmp     edi, 1
        jle     .L9
        lea     edx, [rdi-2]
        lea     rcx, [rsp+24]
        lea     r8, [rsp+28+rdx*4]
.L8:
        mov     esi, DWORD PTR [rcx]
        cmp     esi, eax
        je      .L4
        mov     edx, eax
        mov     eax, esi
        jmp     .L7
.L15:
        sub     eax, edx
        cmp     edx, eax
        je      .L4
.L7:
        cmp     eax, edx
        jg      .L15
        sub     edx, eax
        cmp     edx, eax
        jne     .L7
.L4:
        mov     DWORD PTR [rcx], eax
        add     rcx, 4
        cmp     rcx, r8
        jne     .L8
.L9:
        mov     esi, DWORD PTR [rsp+16+rdi*4]
        mov     edi, OFFSET FLAT:_ZSt4cout
        call    std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
        add     rsp, 440
        xor     eax, eax
        pop     rbx
        pop     rbp
        ret
_GLOBAL__sub_I_main:
        sub     rsp, 8
        mov     edi, OFFSET FLAT:_ZStL8__ioinit
        call    std::ios_base::Init::Init() [complete object constructor]
        mov     edx, OFFSET FLAT:__dso_handle
        mov     esi, OFFSET FLAT:_ZStL8__ioinit
        mov     edi, OFFSET FLAT:_ZNSt8ios_base4InitD1Ev
        add     rsp, 8
        jmp     __cxa_atexit

created 3 years ago

Assembly Online Compiler

Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.

About Assembly

Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.

Every assembler may have it's own assembly language designed for a specific computers or an operating system.

Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.

Syntax help

Assembly language usually consists of three sections,

Data section

To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section

To declare variables
text section

_start specifies the starting of this section where the actually code is written.

Variables

There are various define directives to allocate space for variables for both initialized and uninitialized data.

1. To allocate storage space to Initialized data

Syntax

variable-name    define-directive    initial-value

Define Directive	Description	Allocated Space
DB	Define Byte	1 byte
DW	Define Word	2 bytes
DD	Define Doubleword	4 bytes
DQ	Define Quadword	8 bytes
DT	Define Ten Bytes	10 bytes

2. To allocate storage space to un-initialized data

Define Directive	Description
RESB	Reserve a Byte
RESW	Reserve a Word
RESD	Reserve a Doubleword
RESQ	Reserve a Quadword
REST	Reserve a Ten Bytes

Constants

Constants can be defined using

1. equ

To define numeric constants

CONSTANT_NAME EQU regular-exp or value

2. %assign

To define numeric constants.

%assign constant_name value

3. %define

To define numeric or string constants.

%define constant_name value

Loops

Loops are used to iterate a set of statements for a specific number of times.

mov ECX,n
L1:
;<loop body>
loop L1

where n specifies the no of times loops should iterate.

Procedures

Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

procedure_name:
   ;procedure body
   ret