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

```asm
<sort>:
  endbr64
  cmp    %edx,%esi
  jl     L18
  ret
  nopl   0x0(%rax)
L18:
  lea    (%rsi,%rdx,1),%eax
  push   %r15
  mov    %rdi,%r15
  push   %r14
  push   %r13
  mov    %eax,%r13d
  push   %r12
  shr    $0x1f,%r13d
  mov    %edx,%r12d
  push   %rbp
  add    %eax,%r13d
  mov    %esi,%ebp
  push   %rbx
  sar    %r13d
  sub    $0x18,%rsp
  cmp    %r13d,%esi
  jge    L148
  lea    (%rsi,%r13,1),%eax
  mov    %eax,%r14d
  shr    $0x1f,%r14d
  add    %eax,%r14d
  sar    %r14d
  cmp    %r14d,%esi
  jl     L200
  lea    0x1(%r14),%r8d
  cmp    %r8d,%r13d
  jg     L199
L45:
  mov    %r13d,%ecx
  mov    %r14d,%edx
  mov    %ebp,%esi
  mov    %r15,%rdi
  call   <merge@plt>
L148:
  lea    0x1(%r13),%r8d
  cmp    %r12d,%r8d
  jge    L69
  lea    (%r8,%r12,1),%eax
  mov    %eax,%r14d
  shr    $0x1f,%r14d
  add    %eax,%r14d
  sar    %r14d
  cmp    %r14d,%r8d
  jl     L113
  lea    0x1(%r14),%r9d
  cmp    %r9d,%r12d
  jg     L177
L96:
  mov    %r12d,%ecx
  mov    %r14d,%edx
  mov    %r8d,%esi
  mov    %r15,%rdi
  call   <merge@plt>
L69:
  add    $0x18,%rsp
  mov    %r12d,%ecx
  mov    %r13d,%edx
  mov    %ebp,%esi
  pop    %rbx
  mov    %r15,%rdi
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <merge@plt>
  nopl   (%rax)
L177:
  lea    (%r12,%r9,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r9d
  jge    L121
  lea    (%r9,%rbx,1),%eax
  mov    %r9d,%esi
  mov    %r15,%rdi
  mov    %r8d,0x8(%rsp)
  mov    %eax,%r10d
  mov    %r9d,0x4(%rsp)
  shr    $0x1f,%r10d
  add    %eax,%r10d
  sar    %r10d
  mov    %r10d,%edx
  mov    %r10d,(%rsp)
  call   <sort>
  mov    (%rsp),%r10d
  mov    %ebx,%edx
  mov    %r15,%rdi
  lea    0x1(%r10),%esi
  call   <sort>
  mov    0x4(%rsp),%r9d
  mov    (%rsp),%edx
  mov    %ebx,%ecx
  mov    %r15,%rdi
  mov    %r9d,%esi
  mov    %r9d,(%rsp)
  call   <merge@plt>
  mov    0x8(%rsp),%r8d
  mov    (%rsp),%r9d
L121:
  lea    0x1(%rbx),%r11d
  cmp    %r11d,%r12d
  jle    L162
  lea    (%r12,%r11,1),%eax
  mov    %r11d,%esi
  mov    %r15,%rdi
  mov    %r9d,0xc(%rsp)
  mov    %eax,%r10d
  mov    %r8d,0x8(%rsp)
  shr    $0x1f,%r10d
  mov    %r11d,0x4(%rsp)
  add    %eax,%r10d
  sar    %r10d
  mov    %r10d,%edx
  mov    %r10d,(%rsp)
  call   <sort>
  mov    (%rsp),%r10d
  mov    %r12d,%edx
  mov    %r15,%rdi
  lea    0x1(%r10),%esi
  call   <sort>
  mov    (%rsp),%edx
  mov    0x4(%rsp),%esi
  mov    %r12d,%ecx
  mov    %r15,%rdi
  call   <merge@plt>
  mov    0xc(%rsp),%r9d
  mov    0x8(%rsp),%r8d
L162:
  mov    %r12d,%ecx
  mov    %ebx,%edx
  mov    %r9d,%esi
  mov    %r15,%rdi
  mov    %r8d,(%rsp)
  call   <merge@plt>
  mov    (%rsp),%r8d
  jmp    L96
  nopw   0x0(%rax,%rax,1)
L113:
  lea    (%r8,%r14,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r8d
  jge    L141
  lea    (%r8,%rbx,1),%eax
  mov    %r8d,%esi
  mov    %r15,%rdi
  mov    %r8d,0x4(%rsp)
  mov    %eax,%r9d
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%edx
  mov    %r9d,(%rsp)
  call   <sort>
  mov    (%rsp),%r9d
  mov    %ebx,%edx
  mov    %r15,%rdi
  lea    0x1(%r9),%esi
  call   <sort>
  mov    0x4(%rsp),%r8d
  mov    (%rsp),%edx
  mov    %ebx,%ecx
  mov    %r15,%rdi
  mov    %r8d,%esi
  mov    %r8d,(%rsp)
  call   <merge@plt>
  mov    (%rsp),%r8d
L141:
  lea    0x1(%rbx),%r10d
  cmp    %r10d,%r14d
  jle    L63
  lea    (%r14,%r10,1),%eax
  mov    %r10d,%esi
  mov    %r15,%rdi
  mov    %r8d,0x8(%rsp)
  mov    %eax,%r9d
  mov    %r10d,0x4(%rsp)
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%edx
  mov    %r9d,(%rsp)
  call   <sort>
  mov    (%rsp),%r9d
  mov    %r14d,%edx
  mov    %r15,%rdi
  lea    0x1(%r9),%esi
  call   <sort>
  mov    (%rsp),%edx
  mov    0x4(%rsp),%esi
  mov    %r14d,%ecx
  mov    %r15,%rdi
  call   <merge@plt>
  mov    0x8(%rsp),%r8d
L63:
  mov    %r8d,%esi
  mov    %r14d,%ecx
  mov    %ebx,%edx
  mov    %r15,%rdi
  mov    %r8d,(%rsp)
  call   <merge@plt>
  lea    0x1(%r14),%r9d
  mov    (%rsp),%r8d
  cmp    %r9d,%r12d
  jle    L96
  jmp    L177
  nopl   0x0(%rax,%rax,1)
L199:
  lea    0x0(%r13,%r8,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r8d
  jge    L118
  lea    (%r8,%rbx,1),%eax
  mov    %r8d,%esi
  mov    %r15,%rdi
  mov    %r8d,0x4(%rsp)
  mov    %eax,%r9d
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%edx
  mov    %r9d,(%rsp)
  call   <sort>
  mov    (%rsp),%r9d
  mov    %ebx,%edx
  mov    %r15,%rdi
  lea    0x1(%r9),%esi
  call   <sort>
  mov    0x4(%rsp),%r8d
  mov    (%rsp),%edx
  mov    %ebx,%ecx
  mov    %r15,%rdi
  mov    %r8d,%esi
  mov    %r8d,(%rsp)
  call   <merge@plt>
  mov    (%rsp),%r8d
L118:
  lea    0x1(%rbx),%r10d
  cmp    %r10d,%r13d
  jle    L87
  lea    0x0(%r13,%r10,1),%eax
  mov    %r10d,%esi
  mov    %r15,%rdi
  mov    %r8d,0x8(%rsp)
  mov    %eax,%r9d
  mov    %r10d,0x4(%rsp)
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%edx
  mov    %r9d,(%rsp)
  call   <sort>
  mov    (%rsp),%r9d
  mov    %r13d,%edx
  mov    %r15,%rdi
  lea    0x1(%r9),%esi
  call   <sort>
  mov    (%rsp),%edx
  mov    0x4(%rsp),%esi
  mov    %r13d,%ecx
  mov    %r15,%rdi
  call   <merge@plt>
  mov    0x8(%rsp),%r8d
L87:
  mov    %r13d,%ecx
  mov    %ebx,%edx
  mov    %r8d,%esi
  mov    %r15,%rdi
  call   <merge@plt>
  jmp    L45
  nopl   0x0(%rax,%rax,1)
L200:
  lea    (%rsi,%r14,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%esi
  jge    L190
  lea    (%rsi,%rbx,1),%eax
  mov    %eax,%r8d
  shr    $0x1f,%r8d
  add    %eax,%r8d
  sar    %r8d
  mov    %r8d,%edx
  mov    %r8d,(%rsp)
  call   <sort>
  mov    (%rsp),%r8d
  mov    %ebx,%edx
  mov    %r15,%rdi
  lea    0x1(%r8),%esi
  call   <sort>
  mov    (%rsp),%edx
  mov    %ebx,%ecx
  mov    %ebp,%esi
  mov    %r15,%rdi
  call   <merge@plt>
L190:
  lea    0x1(%rbx),%r9d
  cmp    %r9d,%r14d
  jle    L197
  lea    (%r14,%r9,1),%eax
  mov    %r9d,%esi
  mov    %r15,%rdi
  mov    %r9d,0x4(%rsp)
  mov    %eax,%r8d
  shr    $0x1f,%r8d
  add    %eax,%r8d
  sar    %r8d
  mov    %r8d,%edx
  mov    %r8d,(%rsp)
  call   <sort>
  mov    (%rsp),%r8d
  mov    %r14d,%edx
  mov    %r15,%rdi
  lea    0x1(%r8),%esi
  call   <sort>
  mov    (%rsp),%edx
  mov    0x4(%rsp),%esi
  mov    %r14d,%ecx
  mov    %r15,%rdi
  call   <merge@plt>
L197:
  mov    %r14d,%ecx
  mov    %ebx,%edx
  mov    %ebp,%esi
  mov    %r15,%rdi
  call   <merge@plt>
  lea    0x1(%r14),%r8d
  cmp    %r8d,%r13d
  jle    L45
  jmp    L199
```

assistant: ```c
void sort(int *a, int l, int r) {
  if (l >= r)
    return;
  int m = (l + r) / 2;
  sort(a, l, m);
  sort(a, m + 1, r);
  merge(a, l, m, r);
}
```