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

```asm
<merge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %esi,-0x4c(%rbp)
  mov    %edx,-0x50(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rsi
  mov    -0x50(%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
L120:
  cmp    %rdx,%rsp
  je     L59
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L120
L59:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L45
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L45:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x4c(%rbp),%eax
  mov    %eax,-0x38(%rbp)
  mov    -0x50(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,%edx
  mov    -0x4c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x34(%rbp)
  mov    -0x50(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,%edx
  mov    -0x4c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x30(%rbp)
  mov    -0x4c(%rbp),%eax
  lea    (%rax,%rax,1),%edx
  mov    -0x50(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x2c(%rbp)
  movl   $0x0,-0x3c(%rbp)
  jmp    L64
L143:
  mov    -0x38(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jge    L83
  mov    -0x34(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jge    L83
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x48(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jg     L122
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x20(%rbp),%rax
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x38(%rbp)
  jmp    L65
L122:
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x20(%rbp),%rax
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x34(%rbp)
  jmp    L65
L83:
  mov    -0x38(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jne    L76
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x20(%rbp),%rax
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x34(%rbp)
  jmp    L65
L76:
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x20(%rbp),%rax
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x38(%rbp)
L65:
  addl   $0x1,-0x3c(%rbp)
L64:
  mov    -0x3c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L143
  movl   $0x0,-0x3c(%rbp)
  jmp    L103
L28:
  mov    -0x4c(%rbp),%edx
  mov    -0x3c(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x48(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x20(%rbp),%rax
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%eax
  mov    %eax,(%rcx)
  addl   $0x1,-0x3c(%rbp)
L103:
  mov    -0x3c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L28
  mov    %rsi,%rsp
  nop
  mov    -0x18(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L75
  call   <__stack_chk_fail@plt>
L75:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
void merge(int a[], int start, int n) {
  int t[n], k, i, j;
  i = start;
  j = start + n / 2;
  int l_i = start + n / 2;
  int l_j = start + start + n;
  for (k = 0; k < n; k++) {
    if (i < l_i && j < l_j) {
      if (a[i] <= a[j]) {
        t[k] = a[i];
        i++;
      } else {
        t[k] = a[j];
        j++;
      }
    } else if (i == l_i) {
      t[k] = a[j];
      j++;
    } else {
      t[k] = a[i];
      i++;
    }
  }
  for (k = 0; k < n; k++) {
    a[start + k] = t[k];
  }
}
```