user: Demonstrate the C code that generates the assembly output below:

```asm
<merge_lists>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  mov    %r8,-0x48(%rbp)
  mov    %r9,-0x50(%rbp)
  movl   $0x0,-0x18(%rbp)
  movl   $0x0,-0x14(%rbp)
  movl   $0x0,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x8(%rbp)
  mov    -0x28(%rbp),%rax
  mov    0x4(%rax),%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x0,-0x10(%rbp)
  jmp    L8
L64:
  mov    -0x18(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x14(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x40(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jl     L17
  mov    -0x18(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x14(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x40(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jne    L101
  mov    -0x18(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x14(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x48(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jge    L101
L17:
  mov    -0x10(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  mov    %rax,(%rdx)
  addl   $0x1,-0x18(%rbp)
  jmp    L46
L101:
  mov    -0x8(%rbp),%edx
  mov    -0x14(%rbp),%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x10(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  movslq %ecx,%rax
  mov    %rax,(%rdx)
  addl   $0x1,-0x14(%rbp)
L46:
  addl   $0x1,-0x10(%rbp)
L8:
  mov    -0x14(%rbp),%eax
  cmp    -0x4(%rbp),%eax
  jge    L94
  mov    -0x18(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jl     L64
L94:
  mov    -0x18(%rbp),%eax
  mov    %eax,-0xc(%rbp)
  jmp    L80
L26:
  mov    -0x10(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  mov    %rax,(%rdx)
  addl   $0x1,-0x10(%rbp)
  addl   $0x1,-0x18(%rbp)
  addl   $0x1,-0xc(%rbp)
L80:
  mov    -0x18(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jl     L26
  mov    -0x14(%rbp),%eax
  mov    %eax,-0xc(%rbp)
  jmp    L103
L70:
  mov    -0x8(%rbp),%edx
  mov    -0x14(%rbp),%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x10(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  movslq %ecx,%rax
  mov    %rax,(%rdx)
  addl   $0x1,-0x10(%rbp)
  addl   $0x1,-0x14(%rbp)
  addl   $0x1,-0xc(%rbp)
L103:
  mov    -0x14(%rbp),%eax
  cmp    -0x4(%rbp),%eax
  jl     L70
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void merge_lists(int *nl, int *l11, int *l12, int *l21, int *l22, long *idx) {
  int i1 = 0, i2 = 0, i = 0, ii;
  const int n1 = nl[0], n2 = nl[1];
  i = 0;
  while (i2 < n2 && i1 < n1) {
    if ((l11[i1] < l21[i2]) || (l11[i1] == l21[i2] && l12[i1] < l22[i2])) {
      idx[i] = i1;
      i1++;
    } else {
      idx[i] = n1 + i2;
      i2++;
    }
    i++;
  }
  for (ii = i1; i1 < n1; ii++) {
    idx[i] = i1;
    i++;
    i1++;
  }
  for (ii = i2; i2 < n2; ii++) {
    idx[i] = n1 + i2;
    i++;
    i2++;
  }
}
```