user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<merge_parts>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %esi,-0x4c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rsi
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x28(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r8
  mov    $0x0,%r9d
  movslq %eax,%rdx
  mov    %rdx,%rcx
  mov    $0x0,%ebx
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%ebx
  mov    $0x0,%edx
  div    %rbx
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L89:
  cmp    %rdx,%rsp
  je     L81
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L89
L81:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L16
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L16:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x4c(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,-0x2c(%rbp)
  movl   $0x0,-0x38(%rbp)
  movl   $0x0,-0x34(%rbp)
  mov    -0x2c(%rbp),%eax
  mov    %eax,-0x30(%rbp)
  jmp    L45
L21:
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x30(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x48(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jge    L127
  mov    -0x38(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x38(%rbp)
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  jmp    L49
L127:
  mov    -0x30(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x30(%rbp)
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
L49:
  mov    -0x34(%rbp),%edx
  lea    0x1(%rdx),%ecx
  mov    %ecx,-0x34(%rbp)
  mov    -0x20(%rbp),%rcx
  movslq %edx,%rdx
  mov    %eax,(%rcx,%rdx,4)
L45:
  mov    -0x38(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jge    L117
  mov    -0x30(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L21
  jmp    L117
L74:
  mov    -0x38(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x38(%rbp)
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x34(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x34(%rbp)
  mov    (%rcx),%ecx
  mov    -0x20(%rbp),%rdx
  cltq
  mov    %ecx,(%rdx,%rax,4)
L117:
  mov    -0x38(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jl     L74
  movl   $0x0,-0x38(%rbp)
  jmp    L77
L90:
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x20(%rbp),%rax
  mov    -0x38(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%eax
  mov    %eax,(%rcx)
  addl   $0x1,-0x38(%rbp)
L77:
  mov    -0x38(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jl     L90
  mov    %rsi,%rsp
  nop
  mov    -0x18(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L65
  call   <__stack_chk_fail@plt>
L65:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
void merge_parts(int arr[], int length) {
  int ans[length];
  int mid = length / 2;
  int i = 0, k = 0, j = mid;
  while (i < mid && j < length) {
    ans[k++] = (arr[i] < arr[j]) ? arr[i++] : arr[j++];
  }
  while (i < mid) {
    ans[k++] = arr[i++];
  }
  for (i = 0; i < j; i++) {
    arr[i] = ans[i];
  }
}
```