user: What is the c source code of the assembly code below?

```asm
<sort>:
  endbr64
  cmp    %edx,%esi
  jl     L70
  ret
  nopl   0x0(%rax)
L70:
  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    L30
  lea    (%rsi,%r13,1),%eax
  mov    %eax,%r14d
  shr    $0x1f,%r14d
  add    %eax,%r14d
  sar    %r14d
  cmp    %r14d,%esi
  jl     L26
  lea    0x1(%r14),%r8d
  cmp    %r8d,%r13d
  jg     L78
L142:
  mov    %r13d,%ecx
  mov    %r14d,%edx
  mov    %ebp,%esi
  mov    %r15,%rdi
  call   <merge@plt>
L30:
  lea    0x1(%r13),%r8d
  cmp    %r12d,%r8d
  jge    L3
  lea    (%r8,%r12,1),%eax
  mov    %eax,%r14d
  shr    $0x1f,%r14d
  add    %eax,%r14d
  sar    %r14d
  cmp    %r14d,%r8d
  jl     L125
  lea    0x1(%r14),%r9d
  cmp    %r9d,%r12d
  jg     L96
L80:
  mov    %r12d,%ecx
  mov    %r14d,%edx
  mov    %r8d,%esi
  mov    %r15,%rdi
  call   <merge@plt>
L3:
  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)
L96:
  lea    (%r12,%r9,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r9d
  jge    L131
  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
L131:
  lea    0x1(%rbx),%r11d
  cmp    %r11d,%r12d
  jle    L53
  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
L53:
  mov    %r12d,%ecx
  mov    %ebx,%edx
  mov    %r9d,%esi
  mov    %r15,%rdi
  mov    %r8d,(%rsp)
  call   <merge@plt>
  mov    (%rsp),%r8d
  jmp    L80
  nopw   0x0(%rax,%rax,1)
L125:
  lea    (%r8,%r14,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r8d
  jge    L143
  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
L143:
  lea    0x1(%rbx),%r10d
  cmp    %r10d,%r14d
  jle    L132
  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
L132:
  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    L80
  jmp    L96
  nopl   0x0(%rax,%rax,1)
L78:
  lea    0x0(%r13,%r8,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r8d
  jge    L128
  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
L128:
  lea    0x1(%rbx),%r10d
  cmp    %r10d,%r13d
  jle    L20
  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
L20:
  mov    %r13d,%ecx
  mov    %ebx,%edx
  mov    %r8d,%esi
  mov    %r15,%rdi
  call   <merge@plt>
  jmp    L142
  nopl   0x0(%rax,%rax,1)
L26:
  lea    (%rsi,%r14,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%esi
  jge    L1
  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>
L1:
  lea    0x1(%rbx),%r9d
  cmp    %r9d,%r14d
  jle    L13
  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>
L13:
  mov    %r14d,%ecx
  mov    %ebx,%edx
  mov    %ebp,%esi
  mov    %r15,%rdi
  call   <merge@plt>
  lea    0x1(%r14),%r8d
  cmp    %r8d,%r13d
  jle    L142
  jmp    L78
```

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);
}
```