user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<merge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x18,%rsp
  mov    %rdi,%r11
  mov    %rdx,%r13
  mov    %fs:0x28,%rax
  mov    %rax,-0x28(%rbp)
  xor    %eax,%eax
  mov    %rdx,%rbx
  sub    %rsi,%rbx
  lea    0x1(%rbx),%r12
  sub    %rdx,%rcx
  lea    0x17(,%rbx,8),%rax
  mov    %rax,%rdi
  and    $0xfffffffffffffff0,%rdi
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%rdx
  sub    %rax,%rdx
L184:
  cmp    %rdx,%rsp
  je     L161
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L184
L161:
  mov    %rdi,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L127
  orq    $0x0,-0x8(%rsp,%rax,1)
L127:
  mov    %rsp,%rdi
  lea    0xf(,%rcx,8),%rax
  mov    %rax,%r8
  and    $0xfffffffffffffff0,%r8
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%rdx
  sub    %rax,%rdx
L221:
  cmp    %rdx,%rsp
  je     L133
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L221
L133:
  mov    %r8,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L51
  orq    $0x0,-0x8(%rsp,%rax,1)
L51:
  mov    %rsp,%r8
  test   %r12,%r12
  jle    L10
  lea    0x1(%rbx),%r10
  lea    (%r11,%rsi,8),%r9
  mov    $0x0,%eax
L229:
  mov    (%r9,%rax,8),%rdx
  mov    %rdx,(%rdi,%rax,8)
  add    $0x1,%rax
  cmp    %r10,%rax
  jne    L229
L10:
  test   %rcx,%rcx
  jle    L63
  lea    (%r11,%r13,8),%r9
  mov    $0x0,%eax
L102:
  mov    0x8(%r9,%rax,8),%rdx
  mov    %rdx,(%r8,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%rcx
  jne    L102
  test   %r12,%r12
  jle    L220
  mov    $0x0,%edx
  mov    $0x0,%eax
  jmp    L148
L223:
  mov    %r9,(%r11,%rsi,8)
  add    $0x1,%rdx
L12:
  add    $0x1,%rsi
  cmp    %r12,%rax
  jge    L109
  cmp    %rcx,%rdx
  jge    L109
L148:
  mov    (%rdi,%rax,8),%r10
  mov    (%r8,%rdx,8),%r9
  cmp    %r9,%r10
  jg     L223
  mov    %r10,(%r11,%rsi,8)
  add    $0x1,%rax
  jmp    L12
L109:
  cmp    %r12,%rax
  jge    L42
L189:
  add    $0x1,%rbx
  mov    %rax,%r12
  mov    %rsi,%r10
  sub    %rax,%rsi
  lea    (%r11,%rsi,8),%r9
L91:
  mov    (%rdi,%rax,8),%rsi
  mov    %rsi,(%r9,%rax,8)
  add    $0x1,%rax
  cmp    %rbx,%rax
  jne    L91
  lea    (%r10,%rbx,1),%rax
  sub    %r12,%rax
  mov    %rax,%rsi
L42:
  cmp    %rcx,%rdx
  jge    L153
  sub    %rdx,%rsi
  lea    (%r11,%rsi,8),%rsi
L180:
  mov    (%r8,%rdx,8),%rax
  mov    %rax,(%rsi,%rdx,8)
  add    $0x1,%rdx
  cmp    %rdx,%rcx
  jne    L180
L153:
  mov    -0x28(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L47
  lea    -0x18(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %rbp
  ret
L220:
  mov    $0x0,%edx
  jmp    L42
L63:
  mov    $0x0,%edx
  mov    $0x0,%eax
  test   %r12,%r12
  jg     L189
  jmp    L153
L47:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void merge(long long int arr[], long long int l, long long int m, long long int r) {
  long long int i, j, k;
  long long int n1 = m - l + 1;
  long long int n2 = r - m;
  long long int L[n1], R[n2];
  for (i = 0; i < n1; ++i)
    L[i] = arr[l + i];
  for (j = 0; j < n2; ++j)
    R[j] = arr[m + 1 + j];
  i = 0;
  j = 0;
  k = l;
  while (i < n1 && j < n2) {
    if (L[i] <= R[j]) {
      arr[k] = L[i];
      i++;
    } else {
      arr[k] = R[j];
      j++;
    }
    k++;
  }
  while (i < n1) {
    arr[k] = L[i];
    i++;
    k++;
  }
  while (j < n2) {
    arr[k] = R[j];
    j++;
    k++;
  }
}
```