user: 请从给定的汇编指令推导出C源代码:

```asm
<ex8>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  lea    D123(%rip),%rdi
  call   <printf@plt>
  lea    D160(%rip),%r12
  lea    0x8(%rsp),%rbp
  lea    D50(%rip),%rbx
L125:
  mov    %r12,%rdi
  call   <printf@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <scanf@plt>
  mov    0x8(%rsp),%eax
  sub    $0x1,%eax
  cmp    $0x1e,%eax
  ja     L125
  lea    D135(%rip),%r12
  lea    0x4(%rsp),%rbp
  lea    D50(%rip),%rbx
L110:
  mov    %r12,%rdi
  call   <printf@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <scanf@plt>
  mov    0x4(%rsp),%eax
  sub    $0x1,%eax
  cmp    $0xb,%eax
  ja     L110
  lea    D84(%rip),%r12
  mov    %rsp,%rbp
  lea    D50(%rip),%rbx
L108:
  mov    %r12,%rdi
  call   <printf@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <scanf@plt>
  cmpl   $0x0,(%rsp)
  jle    L108
  lea    D51(%rip),%rdi
  call   <printf@plt>
  lea    D160(%rip),%r12
  lea    0x14(%rsp),%rbp
  lea    D50(%rip),%rbx
L152:
  mov    %r12,%rdi
  call   <printf@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <scanf@plt>
  mov    0x14(%rsp),%eax
  sub    $0x1,%eax
  cmp    $0x1e,%eax
  ja     L152
  lea    D135(%rip),%r12
  lea    0x10(%rsp),%rbp
  lea    D50(%rip),%rbx
L35:
  mov    %r12,%rdi
  call   <printf@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <scanf@plt>
  mov    0x10(%rsp),%eax
  sub    $0x1,%eax
  cmp    $0xb,%eax
  ja     L35
  lea    D84(%rip),%r12
  lea    0xc(%rsp),%rbp
  lea    D50(%rip),%rbx
L177:
  mov    %r12,%rdi
  call   <printf@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <scanf@plt>
  mov    0xc(%rsp),%eax
  test   %eax,%eax
  jle    L177
  mov    (%rsp),%edx
  cmp    %edx,%eax
  jl     L72
  jg     L188
  mov    0x4(%rsp),%edx
  mov    0x10(%rsp),%eax
  cmp    %eax,%edx
  jg     L187
  jl     L86
  mov    0x8(%rsp),%edx
  mov    0x14(%rsp),%eax
  cmp    %eax,%edx
  jg     L160
  jge    L42
  lea    D151(%rip),%rdi
  call   <printf@plt>
  jmp    L5
L72:
  lea    D188(%rip),%rdi
  call   <printf@plt>
L5:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L113
  add    $0x20,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L188:
  lea    D151(%rip),%rdi
  call   <printf@plt>
  jmp    L5
L187:
  lea    D188(%rip),%rdi
  call   <printf@plt>
  jmp    L5
L86:
  lea    D151(%rip),%rdi
  call   <printf@plt>
  jmp    L5
L160:
  lea    D188(%rip),%rdi
  call   <printf@plt>
  jmp    L5
L42:
  lea    D144(%rip),%rdi
  call   <printf@plt>
  jmp    L5
L113:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: label: D123
type_infered: string
name: unpack_data
arguments: label: D160
type_infered: string
name: unpack_data
arguments: label: D50
type_infered: string
name: unpack_data
arguments: label: D135
type_infered: string
name: unpack_data
arguments: label: D84
type_infered: string
name: unpack_data
arguments: label: D51
type_infered: string
name: unpack_data
arguments: label: D151
type_infered: string
name: unpack_data
arguments: label: D188
type_infered: string
name: unpack_data
arguments: label: D144
type_infered: string

tool: D123: Informe a primeira data: 


tool: D160: 	Dia: 

tool: D50: %d

tool: D135: 	Mes: 

tool: D84: 	Ano: 

tool: D51: Informe a segunda data: 


tool: D151: A segunda data e maior.


tool: D188: A primeira data e maior.


tool: D144: As datas sao iguais.


assistant: ```c
void ex8() {
  int ano1, mes1, dia1, ano2, mes2, dia2;
  printf("Informe a primeira data: \n");
  do {
    printf("\tDia: ");
    scanf("%d", &dia1);
  } while (!(dia1 > 0 && dia1 < 32));
  do {
    printf("\tMes: ");
    scanf("%d", &mes1);
  } while (!(mes1 > 0 && mes1 < 13));
  do {
    printf("\tAno: ");
    scanf("%d", &ano1);
  } while (!(ano1 > 0));
  printf("Informe a segunda data: \n");
  do {
    printf("\tDia: ");
    scanf("%d", &dia2);
  } while (!(dia2 > 0 && dia2 < 32));
  do {
    printf("\tMes: ");
    scanf("%d", &mes2);
  } while (!(mes2 > 0 && mes2 < 13));
  do {
    printf("\tAno: ");
    scanf("%d", &ano2);
  } while (!(ano2 > 0));
  if (ano1 > ano2)
    printf("A primeira data e maior.\n");
  else if (ano2 > ano1)
    printf("A segunda data e maior.\n");
  else {
    if (mes1 > mes2)
      printf("A primeira data e maior.\n");
    else if (mes2 > mes1)
      printf("A segunda data e maior.\n");
    else {
      if (dia1 > dia2)
        printf("A primeira data e maior.\n");
      else if (dia2 > dia1)
        printf("A segunda data e maior.\n");
      else
        printf("As datas sao iguais.\n");
    }
  }
}
```