user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<union_uint16>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x70,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %rdx,-0x58(%rbp)
  mov    %rcx,-0x60(%rbp)
  mov    %r8,-0x68(%rbp)
  movq   $0x0,-0x38(%rbp)
  movq   $0x0,-0x30(%rbp)
  movq   $0x0,-0x28(%rbp)
  cmpq   $0x0,-0x60(%rbp)
  jne    L134
  mov    -0x50(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rcx
  mov    -0x68(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memmove@plt>
  mov    -0x50(%rbp),%rax
  jmp    L108
L134:
  cmpq   $0x0,-0x50(%rbp)
  jne    L110
  mov    -0x60(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x58(%rbp),%rcx
  mov    -0x68(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memmove@plt>
  mov    -0x60(%rbp),%rax
  jmp    L108
L110:
  mov    -0x30(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x18(%rbp)
L140:
  mov    -0x20(%rbp),%rax
  cmp    -0x18(%rbp),%rax
  jge    L127
  mov    -0x38(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x38(%rbp)
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rax,%rdx
  mov    -0x20(%rbp),%rax
  mov    %rax,(%rdx)
  addq   $0x1,-0x30(%rbp)
  mov    -0x30(%rbp),%rax
  cmp    -0x50(%rbp),%rax
  jae    L119
  mov    -0x30(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x20(%rbp)
  jmp    L140
L127:
  mov    -0x18(%rbp),%rax
  cmp    -0x20(%rbp),%rax
  jge    L163
  mov    -0x38(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x38(%rbp)
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rax,%rdx
  mov    -0x18(%rbp),%rax
  mov    %rax,(%rdx)
  addq   $0x1,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  cmp    -0x60(%rbp),%rax
  jae    L165
  mov    -0x28(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x18(%rbp)
  jmp    L140
L163:
  mov    -0x38(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x38(%rbp)
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rax,%rdx
  mov    -0x20(%rbp),%rax
  mov    %rax,(%rdx)
  addq   $0x1,-0x30(%rbp)
  addq   $0x1,-0x28(%rbp)
  mov    -0x30(%rbp),%rax
  cmp    -0x50(%rbp),%rax
  jae    L164
  mov    -0x28(%rbp),%rax
  cmp    -0x60(%rbp),%rax
  jae    L164
  mov    -0x30(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
  mov    %rax,-0x18(%rbp)
  jmp    L140
L119:
  nop
  jmp    L164
L165:
  nop
L164:
  mov    -0x30(%rbp),%rax
  cmp    -0x50(%rbp),%rax
  jae    L40
  mov    -0x50(%rbp),%rax
  sub    -0x30(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x30(%rbp),%rax
  lea    0x0(,%rax,8),%rcx
  mov    -0x48(%rbp),%rax
  add    %rax,%rcx
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,8),%rsi
  mov    -0x68(%rbp),%rax
  add    %rsi,%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memmove@plt>
  mov    -0x8(%rbp),%rax
  add    %rax,-0x38(%rbp)
  jmp    L16
L40:
  mov    -0x28(%rbp),%rax
  cmp    -0x60(%rbp),%rax
  jae    L16
  mov    -0x60(%rbp),%rax
  sub    -0x28(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  lea    0x0(,%rax,8),%rcx
  mov    -0x58(%rbp),%rax
  add    %rax,%rcx
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,8),%rsi
  mov    -0x68(%rbp),%rax
  add    %rsi,%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memmove@plt>
  mov    -0x10(%rbp),%rax
  add    %rax,-0x38(%rbp)
L16:
  mov    -0x38(%rbp),%rax
L108:
  leave
  ret
```

assistant: ```c
size_t union_uint16(const uint16_t *set_1, size_t size_1, const uint16_t *set_2, size_t size_2, uint16_t *buffer) {
  size_t pos = 0, idx_1 = 0, idx_2 = 0;
  if (0 == size_2) {
    memmove(buffer, set_1, size_1 * sizeof(uint16_t));
    return size_1;
  }
  if (0 == size_1) {
    memmove(buffer, set_2, size_2 * sizeof(uint16_t));
    return size_2;
  }
  uint16_t val_1 = set_1[idx_1], val_2 = set_2[idx_2];
  while (true) {
    if (val_1 < val_2) {
      buffer[pos++] = val_1;
      ++idx_1;
      if (idx_1 >= size_1)
        break;
      val_1 = set_1[idx_1];
    } else if (val_2 < val_1) {
      buffer[pos++] = val_2;
      ++idx_2;
      if (idx_2 >= size_2)
        break;
      val_2 = set_2[idx_2];
    } else {
      buffer[pos++] = val_1;
      ++idx_1;
      ++idx_2;
      if (idx_1 >= size_1 || idx_2 >= size_2)
        break;
      val_1 = set_1[idx_1];
      val_2 = set_2[idx_2];
    }
  }
  if (idx_1 < size_1) {
    const size_t n_elems = size_1 - idx_1;
    memmove(buffer + pos, set_1 + idx_1, n_elems * sizeof(uint16_t));
    pos += n_elems;
  } else if (idx_2 < size_2) {
    const size_t n_elems = size_2 - idx_2;
    memmove(buffer + pos, set_2 + idx_2, n_elems * sizeof(uint16_t));
    pos += n_elems;
  }
  return pos;
}
```