user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<main>:
  endbr64
  push   %r13
  mov    $0xb,%r9d
  mov    $0xb,%r8d
  lea    D39(%rip),%r13
  push   %r12
  mov    $0xc,%ecx
  mov    $0xd,%edx
  mov    %r13,%rdi
  push   %rbp
  mov    $0xd,%esi
  lea    D18(%rip),%r12
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  movabs $0x9090a0b0b0c0d0d,%rax
  movb   $0xa,0x17(%rsp)
  mov    %rax,0xf(%rsp)
  movabs $0x1415130e08070a0f,%rax
  mov    %rax,0x7(%rsp)
  xor    %eax,%eax
  push   $0xa
  push   $0x9
  push   $0x9
  push   $0xa
  call   <printf@plt>
  movzbl 0x2e(%rsp),%eax
  add    $0x18,%rsp
  movzbl 0x11(%rsp),%ecx
  movzbl 0x10(%rsp),%edx
  movzbl 0xf(%rsp),%esi
  mov    %r12,%rdi
  push   %rax
  movzbl 0x1d(%rsp),%eax
  push   %rax
  movzbl 0x24(%rsp),%eax
  push   %rax
  movzbl 0x2b(%rsp),%r9d
  xor    %eax,%eax
  movzbl 0x2a(%rsp),%r8d
  call   <printf@plt>
  add    $0x20,%rsp
  lea    D27(%rip),%rdi
  call   <puts@plt>
  xor    %eax,%eax
  call   <mmx_start_block@plt>
  lea    0x7(%rsp),%rdx
  lea    0xf(%rsp),%rdi
  lea    0x10(%rsp),%rsi
  call   <mmx_avgdiff@plt>
  xor    %eax,%eax
  call   <mmx_accum_avgdiff@plt>
  movzbl 0x11(%rsp),%ecx
  movzbl 0x10(%rsp),%edx
  mov    %r13,%rdi
  mov    %eax,%ebp
  movzbl 0x17(%rsp),%eax
  movzbl 0xf(%rsp),%esi
  push   %rax
  movzbl 0x1e(%rsp),%eax
  push   %rax
  movzbl 0x25(%rsp),%eax
  push   %rax
  movzbl 0x2c(%rsp),%eax
  push   %rax
  movzbl 0x33(%rsp),%r9d
  xor    %eax,%eax
  movzbl 0x32(%rsp),%r8d
  call   <printf@plt>
  movzbl 0x2e(%rsp),%eax
  add    $0x18,%rsp
  movzbl 0xf(%rsp),%esi
  movzbl 0x11(%rsp),%ecx
  movzbl 0x10(%rsp),%edx
  mov    %r12,%rdi
  push   %rax
  movzbl 0x1d(%rsp),%eax
  push   %rax
  movzbl 0x24(%rsp),%eax
  push   %rax
  movzbl 0x2b(%rsp),%r9d
  xor    %eax,%eax
  movzbl 0x2a(%rsp),%r8d
  call   <printf@plt>
  add    $0x20,%rsp
  xor    %eax,%eax
  mov    %ebp,%esi
  lea    D29(%rip),%rdi
  call   <printf@plt>
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L3
  add    $0x20,%rsp
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L3:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: label: D39
type_infered: string
name: read_data
arguments: label: D18
type_infered: string
name: read_data
arguments: label: D27
type_infered: string
name: read_data
arguments: label: D29
type_infered: string

tool: D39: %d %d %d %d %d %d %d %d %d


tool: D18: %d %d %d %d %d %d %d %d


tool: D27: -----------------------

tool: D29: %d


assistant: ```c
int main(int argc, char *argv[]) {
  unsigned char pixels1[9] = {13, 13, 12, 11, 11, 10, 9, 9, 10};
  unsigned char pixels3[8] = {15, 10, 7, 8, 14, 19, 21, 20};
  unsigned char *p1, *p2, *p3;
  unsigned int result;
  p1 = &pixels1[0];
  p2 = &pixels1[1];
  p3 = &pixels3[0];
  printf("%d %d %d %d %d %d %d %d %d\n", p1[0], p1[1], p1[2], p1[3], p1[4], p1[5], p1[6], p1[7], p1[8]);
  printf("%d %d %d %d %d %d %d %d\n", p3[0], p3[1], p3[2], p3[3], p3[4], p3[5], p3[6], p3[7]);
  printf("-----------------------\n");
  mmx_start_block();
  mmx_avgdiff(p1, p2, p3);
  result = mmx_accum_avgdiff();
  printf("%d %d %d %d %d %d %d %d %d\n", p1[0], p1[1], p1[2], p1[3], p1[4], p1[5], p1[6], p1[7], p1[8]);
  printf("%d %d %d %d %d %d %d %d\n", p3[0], p3[1], p3[2], p3[3], p3[4], p3[5], p3[6], p3[7]);
  printf("%d\n", result);
}
```