c语言 生成汇编代码

#include <stdio.h>

// test.c
int main()
{
    int a = 1;
    int b = 2;
    a = a + b;
}

gcc -g -c test.c
objdump -d test.o

test.o: file format Mach-O 64-bit x86-64

Disassembly of section __TEXT,__text:
_main:
       0:   55  pushq   %rbp
       1:   48 89 e5    movq    %rsp, %rbp
       4:   31 c0   xorl    %eax, %eax
       6:   c7 45 fc 01 00 00 00    movl    $1, -4(%rbp)
       d:   c7 45 f8 02 00 00 00    movl    $2, -8(%rbp)
      14:   8b 4d fc    movl    -4(%rbp), %ecx
      17:   03 4d f8    addl    -8(%rbp), %ecx
      1a:   89 4d fc    movl    %ecx, -4(%rbp)
      1d:   5d  popq    %rbp
      1e:   c3  retq