user: 请将以下的汇编代码转换成C语言代码:

```asm
<mergesort>:
  endbr64
  cmp    %edx,%esi
  jl     L83
  ret
  nopl   0x0(%rax)
L83:
  lea    (%rsi,%rdx,1),%eax
  push   %r15
  push   %r14
  mov    %rdi,%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
  jl     L68
  lea    0x1(%r13),%r15d
  cmp    %r12d,%r15d
  jl     L10
L69:
  add    $0x18,%rsp
  mov    %r12d,%ecx
  mov    %r13d,%edx
  mov    %ebp,%esi
  pop    %rbx
  mov    %r14,%rdi
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <merge@plt>
  nopw   0x0(%rax,%rax,1)
L68:
  lea    (%rsi,%r13,1),%eax
  mov    %eax,%r15d
  shr    $0x1f,%r15d
  add    %eax,%r15d
  sar    %r15d
  cmp    %r15d,%esi
  jl     L65
L102:
  lea    0x1(%r15),%ebx
  cmp    %ebx,%r13d
  jg     L97
L67:
  mov    %r15d,%edx
  mov    %r13d,%ecx
  mov    %ebp,%esi
  mov    %r14,%rdi
  call   <merge@plt>
  lea    0x1(%r13),%r15d
  cmp    %r12d,%r15d
  jge    L69
L10:
  lea    (%r15,%r12,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %ebx,%r15d
  jl     L74
L107:
  lea    0x1(%rbx),%r8d
  cmp    %r8d,%r12d
  jg     L59
L42:
  mov    %r12d,%ecx
  mov    %ebx,%edx
  mov    %r15d,%esi
  mov    %r14,%rdi
  call   <merge@plt>
  jmp    L69
  nopl   0x0(%rax,%rax,1)
L65:
  lea    (%rsi,%r15,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  mov    %ebx,%edx
  call   <mergesort>
  lea    0x1(%rbx),%esi
  mov    %r15d,%edx
  mov    %r14,%rdi
  call   <mergesort>
  mov    %r15d,%ecx
  mov    %ebx,%edx
  mov    %ebp,%esi
  mov    %r14,%rdi
  call   <merge@plt>
  jmp    L102
  cs nopw 0x0(%rax,%rax,1)
L59:
  lea    (%r12,%r8,1),%eax
  mov    %r8d,%esi
  mov    %r14,%rdi
  mov    %r8d,0xc(%rsp)
  mov    %eax,%r9d
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%edx
  mov    %r9d,0x8(%rsp)
  call   <mergesort>
  mov    0x8(%rsp),%r9d
  mov    %r12d,%edx
  mov    %r14,%rdi
  lea    0x1(%r9),%esi
  call   <mergesort>
  mov    0x8(%rsp),%edx
  mov    0xc(%rsp),%esi
  mov    %r12d,%ecx
  mov    %r14,%rdi
  call   <merge@plt>
  jmp    L42
  nopl   (%rax)
L74:
  lea    (%r15,%rbx,1),%eax
  mov    %r15d,%esi
  mov    %r14,%rdi
  mov    %eax,%r8d
  shr    $0x1f,%r8d
  add    %eax,%r8d
  sar    %r8d
  mov    %r8d,%edx
  mov    %r8d,0x8(%rsp)
  call   <mergesort>
  mov    0x8(%rsp),%r8d
  mov    %ebx,%edx
  mov    %r14,%rdi
  lea    0x1(%r8),%esi
  call   <mergesort>
  mov    0x8(%rsp),%edx
  mov    %ebx,%ecx
  mov    %r15d,%esi
  mov    %r14,%rdi
  call   <merge@plt>
  jmp    L107
  nopl   (%rax)
L97:
  lea    0x0(%r13,%rbx,1),%eax
  mov    %ebx,%esi
  mov    %r14,%rdi
  mov    %eax,%r8d
  shr    $0x1f,%r8d
  add    %eax,%r8d
  sar    %r8d
  mov    %r8d,%edx
  mov    %r8d,0x8(%rsp)
  call   <mergesort>
  mov    0x8(%rsp),%r8d
  mov    %r13d,%edx
  mov    %r14,%rdi
  lea    0x1(%r8),%esi
  call   <mergesort>
  mov    0x8(%rsp),%edx
  mov    %r13d,%ecx
  mov    %ebx,%esi
  mov    %r14,%rdi
  call   <merge@plt>
  jmp    L67
```

assistant: ```c
void mergesort(int *l, int low, int high) {
  int middle;
  if (low < high) {
    middle = (low + high) / 2;
    mergesort(l, low, middle);
    mergesort(l, middle + 1, high);
    merge(l, low, middle, high);
  }
}
```