user: 下面的汇编指令对应的C源代码是什么：

```asm
<sort_and_stuff>:
  endbr64
  push   %r15
  push   %r14
  mov    %rdi,%r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  sub    $0xa8,%rsp
  test   %rdi,%rdi
  jne    L1047
  jmp    L226
  nopl   (%rax)
L1063:
  mov    0x8(%r14),%r14
  lea    0x8(%rbp),%r12
  mov    0x8(%rbp),%rbp
  test   %r14,%r14
  je     L576
L1047:
  mov    0x8(%r14),%r14
  test   %r14,%r14
  jne    L1063
L576:
  cmp    %rbp,%rdi
  je     L226
  movq   $0x0,(%r12)
  mov    %rdi,%r14
  mov    %rdi,%r12
  jmp    L985
  nopl   0x0(%rax,%rax,1)
L171:
  mov    0x8(%r14),%r14
  lea    0x8(%r12),%r13
  mov    0x8(%r12),%r12
  test   %r14,%r14
  je     L760
L985:
  mov    0x8(%r14),%r14
  test   %r14,%r14
  jne    L171
L760:
  cmp    %r12,%rdi
  je     L515
  movq   $0x0,0x0(%r13)
  mov    %rdi,%r14
  mov    %rdi,%r13
  jmp    L393
  nopl   (%rax)
L509:
  mov    0x8(%r14),%r14
  lea    0x8(%r13),%r11
  mov    0x8(%r13),%r13
  test   %r14,%r14
  je     L639
L393:
  mov    0x8(%r14),%r14
  test   %r14,%r14
  jne    L509
L639:
  cmp    %r13,%rdi
  je     L425
  movq   $0x0,(%r11)
  mov    %rdi,%r14
  mov    %rdi,%r11
  jmp    L1051
  nopw   0x0(%rax,%rax,1)
L141:
  mov    0x8(%r11),%r11
  lea    0x8(%r14),%rsi
  mov    0x8(%r14),%r14
  test   %r11,%r11
  je     L816
L1051:
  mov    0x8(%r11),%r11
  test   %r11,%r11
  jne    L141
L816:
  cmp    %r14,%rdi
  je     L415
  movq   $0x0,(%rsi)
  mov    %rdi,%r15
  mov    %rdi,%rsi
  jmp    L589
  nopw   0x0(%rax,%rax,1)
L601:
  mov    0x8(%rsi),%rsi
  lea    0x8(%r15),%rax
  mov    0x8(%r15),%r15
  test   %rsi,%rsi
  je     L33
L589:
  mov    0x8(%rsi),%rsi
  test   %rsi,%rsi
  jne    L601
L33:
  cmp    %r15,%rdi
  je     L161
  movq   $0x0,(%rax)
  mov    %rdx,0x60(%rsp)
  mov    %r10,0x58(%rsp)
  mov    %r9,0x30(%rsp)
  mov    %rcx,0x28(%rsp)
  mov    %r8,0x20(%rsp)
  call   <sort_and_stuff>
  mov    %r15,%rdi
  mov    %rax,0x18(%rsp)
  call   <sort_and_stuff>
  mov    0x18(%rsp),%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    0x60(%rsp),%rdx
  mov    0x58(%rsp),%r10
  mov    0x30(%rsp),%r9
  mov    0x28(%rsp),%rcx
  mov    %rax,%r15
  mov    0x20(%rsp),%r8
L161:
  mov    %r14,%rax
  mov    %r14,%r11
  test   %r14,%r14
  jne    L914
  jmp    L744
  nop
L433:
  mov    0x8(%rax),%rax
  lea    0x8(%r11),%r10
  mov    0x8(%r11),%r11
  test   %rax,%rax
  je     L1076
L914:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L433
L1076:
  cmp    %r14,%r11
  mov    %r11,0x18(%rsp)
  je     L744
  movq   $0x0,(%r10)
  mov    %r14,%rdi
  mov    %rdx,0x58(%rsp)
  mov    %r9,0x30(%rsp)
  mov    %rcx,0x28(%rsp)
  mov    %r8,0x20(%rsp)
  call   <sort_and_stuff>
  mov    0x18(%rsp),%rdi
  mov    %rax,%r14
  call   <sort_and_stuff>
  mov    %r14,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    0x58(%rsp),%rdx
  mov    0x30(%rsp),%r9
  mov    0x28(%rsp),%rcx
  mov    0x20(%rsp),%r8
  mov    %rax,%r14
L744:
  mov    %r14,%rsi
  mov    %r15,%rdi
  mov    %rdx,0x30(%rsp)
  mov    %r9,0x28(%rsp)
  mov    %rcx,0x20(%rsp)
  mov    %r8,0x18(%rsp)
  call   <merge_and_stuff@plt>
  mov    0x30(%rsp),%rdx
  mov    0x28(%rsp),%r9
  mov    0x20(%rsp),%rcx
  mov    0x18(%rsp),%r8
  mov    %rax,%r14
L415:
  mov    %r13,%rax
  mov    %r13,%r15
  test   %r13,%r13
  jne    L300
  jmp    L645
  nopl   0x0(%rax)
L99:
  mov    0x8(%rax),%rax
  lea    0x8(%r15),%r9
  mov    0x8(%r15),%r15
  test   %rax,%rax
  je     L1015
L300:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L99
L1015:
  cmp    %r13,%r15
  je     L645
  movq   $0x0,(%r9)
  mov    %r13,%rdi
  mov    %rdx,0x28(%rsp)
  mov    %rcx,0x20(%rsp)
  mov    %r8,0x18(%rsp)
  call   <sort_and_stuff>
  mov    %r15,%rdi
  mov    %rax,%r13
  call   <sort_and_stuff>
  mov    %r13,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    0x28(%rsp),%rdx
  mov    0x20(%rsp),%rcx
  mov    0x18(%rsp),%r8
  mov    %rax,%r13
L645:
  mov    %r13,%rsi
  mov    %r14,%rdi
  mov    %rdx,0x28(%rsp)
  mov    %rcx,0x20(%rsp)
  mov    %r8,0x18(%rsp)
  call   <merge_and_stuff@plt>
  mov    0x28(%rsp),%rdx
  mov    0x20(%rsp),%rcx
  mov    0x18(%rsp),%r8
  mov    %rax,%r13
L425:
  mov    %r12,%rax
  mov    %r12,%r14
  test   %r12,%r12
  jne    L455
  jmp    L1016
  nopl   0x0(%rax)
L163:
  mov    0x8(%rax),%rax
  lea    0x8(%r14),%rcx
  mov    0x8(%r14),%r14
  test   %rax,%rax
  je     L377
L455:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L163
L377:
  cmp    %r12,%r14
  je     L1016
  movq   $0x0,(%rcx)
  mov    %r12,%rax
  mov    %r12,%r15
  jmp    L468
  nopw   0x0(%rax,%rax,1)
L390:
  mov    0x8(%rax),%rax
  lea    0x8(%r15),%r8
  mov    0x8(%r15),%r15
  test   %rax,%rax
  je     L0
L468:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L390
L0:
  cmp    %r12,%r15
  je     L372
  movq   $0x0,(%r8)
  mov    %r12,%rdi
  mov    %rdx,0x18(%rsp)
  call   <sort_and_stuff>
  mov    %r15,%rdi
  mov    %rax,%r12
  call   <sort_and_stuff>
  mov    %r12,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    0x18(%rsp),%rdx
  mov    %rax,%r12
L372:
  mov    %r14,%rax
  mov    %r14,%r15
  test   %r14,%r14
  jne    L824
  jmp    L150
  nopl   0x0(%rax)
L877:
  mov    0x8(%rax),%rax
  lea    0x8(%r15),%rdx
  mov    0x8(%r15),%r15
  test   %rax,%rax
  je     L776
L824:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L877
L776:
  cmp    %r14,%r15
  je     L150
  movq   $0x0,(%rdx)
  mov    %r14,%rax
  mov    %r14,%r8
  mov    0x68(%rsp),%rdx
  jmp    L811
  nopl   0x0(%rax,%rax,1)
L625:
  mov    0x8(%rax),%rax
  lea    0x8(%r8),%rdx
  mov    0x8(%r8),%r8
  test   %rax,%rax
  je     L551
L811:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L625
L551:
  cmp    %r14,%r8
  mov    %r8,0x18(%rsp)
  je     L808
  movq   $0x0,(%rdx)
  mov    %r14,%rdi
  call   <sort_and_stuff>
  mov    0x18(%rsp),%rdi
  mov    %rax,%r14
  call   <sort_and_stuff>
  mov    %r14,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%r14
L808:
  mov    %r15,%rdi
  call   <sort_and_stuff>
  mov    %r14,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%r14
L150:
  mov    %r12,%rdi
  mov    %r14,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%r12
L1016:
  mov    %r12,%rsi
  mov    %r13,%rdi
  call   <merge_and_stuff@plt>
  mov    %rax,%r12
L515:
  mov    %rbp,%rax
  mov    %rbp,%r13
  test   %rbp,%rbp
  jne    L46
  jmp    L160
L351:
  mov    0x8(%rax),%rax
  lea    0x8(%r13),%rbx
  mov    0x8(%r13),%r13
  test   %rax,%rax
  je     L19
L46:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L351
L19:
  cmp    %rbp,%r13
  je     L160
  movq   $0x0,(%rbx)
  mov    0x10(%rsp),%rdx
  mov    %rbp,%rax
  mov    %rbp,%r14
  jmp    L597
  nopw   0x0(%rax,%rax,1)
L828:
  mov    0x8(%rax),%rax
  lea    0x8(%r14),%rdx
  mov    0x8(%r14),%r14
  test   %rax,%rax
  je     L69
L597:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L828
L69:
  mov    %rdx,0x10(%rsp)
  cmp    %rbp,%r14
  je     L39
  mov    0x10(%rsp),%rax
  mov    0x40(%rsp),%rdx
  mov    %rbp,%r15
  movq   $0x0,(%rax)
  mov    %rbp,%rax
  jmp    L691
  nopl   0x0(%rax)
L562:
  mov    0x8(%rax),%rax
  lea    0x8(%r15),%rdx
  mov    0x8(%r15),%r15
  test   %rax,%rax
  je     L107
L691:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L562
L107:
  cmp    %rbp,%r15
  je     L443
  movq   $0x0,(%rdx)
  mov    %rbp,%rax
  mov    %rbp,%rbx
  mov    0x70(%rsp),%rdx
  jmp    L165
  nop
L1060:
  mov    0x8(%rax),%rax
  lea    0x8(%rbx),%rdx
  mov    0x8(%rbx),%rbx
  test   %rax,%rax
  je     L138
L165:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L1060
L138:
  cmp    %rbp,%rbx
  je     L311
  movq   $0x0,(%rdx)
  mov    %rbp,%rdi
  call   <sort_and_stuff>
  mov    %rbx,%rdi
  mov    %rax,%rbp
  call   <sort_and_stuff>
  mov    %rbp,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbp
L311:
  mov    0x88(%rsp),%rdx
  mov    %r15,%rax
  mov    %r15,%rbx
  test   %r15,%r15
  jne    L688
  jmp    L943
  nopl   0x0(%rax)
L805:
  mov    0x8(%rax),%rax
  lea    0x8(%rbx),%rdx
  mov    0x8(%rbx),%rbx
  test   %rax,%rax
  je     L594
L688:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L805
L594:
  cmp    %rbx,%r15
  je     L943
  movq   $0x0,(%rdx)
  mov    %r15,%rdi
  call   <sort_and_stuff>
  mov    %rbx,%rdi
  mov    %rax,%r15
  call   <sort_and_stuff>
  mov    %r15,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbx
L943:
  mov    %rbp,%rdi
  mov    %rbx,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbp
L443:
  mov    0x38(%rsp),%rdx
  mov    %r14,%rax
  mov    %r14,%r15
  test   %r14,%r14
  jne    L886
  jmp    L178
  nopw   0x0(%rax,%rax,1)
L1054:
  mov    0x8(%rax),%rax
  lea    0x8(%r15),%rdx
  mov    0x8(%r15),%r15
  test   %rax,%rax
  je     L620
L886:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L1054
L620:
  cmp    %r15,%r14
  je     L178
  movq   $0x0,(%rdx)
  mov    %r14,%rdi
  call   <sort_and_stuff>
  mov    %r15,%rdi
  mov    %rax,%r14
  call   <sort_and_stuff>
  mov    %r14,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%r15
L178:
  mov    %rbp,%rdi
  mov    %r15,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbp
L39:
  mov    0x8(%rsp),%rdx
  mov    %r13,%rax
  mov    %r13,%r14
  test   %r13,%r13
  jne    L143
  jmp    L956
  nopw   0x0(%rax,%rax,1)
L93:
  mov    0x8(%rax),%rax
  lea    0x8(%r14),%rdx
  mov    0x8(%r14),%r14
  test   %rax,%rax
  je     L164
L143:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L93
L164:
  mov    %rdx,0x8(%rsp)
  cmp    %r13,%r14
  je     L956
  mov    0x8(%rsp),%rax
  mov    0x50(%rsp),%rdx
  mov    %r13,%r15
  movq   $0x0,(%rax)
  mov    %r13,%rax
  jmp    L748
  nopl   0x0(%rax)
L690:
  mov    0x8(%rax),%rax
  lea    0x8(%r15),%rdx
  mov    0x8(%r15),%r15
  test   %rax,%rax
  je     L294
L748:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L690
L294:
  cmp    %r15,%r13
  je     L13
  movq   $0x0,(%rdx)
  mov    %r13,%rax
  mov    %r13,%rbx
  mov    0x78(%rsp),%rdx
  jmp    L105
  nop
L679:
  mov    0x8(%rax),%rax
  lea    0x8(%rbx),%rdx
  mov    0x8(%rbx),%rbx
  test   %rax,%rax
  je     L531
L105:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L679
L531:
  cmp    %rbx,%r13
  je     L1022
  movq   $0x0,(%rdx)
  mov    %r13,%rdi
  call   <sort_and_stuff>
  mov    %rbx,%rdi
  mov    %rax,%r13
  call   <sort_and_stuff>
  mov    %r13,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbx
L1022:
  mov    0x90(%rsp),%rdx
  mov    %r15,%rax
  mov    %r15,%r13
  test   %r15,%r15
  jne    L327
  jmp    L838
  nopl   0x0(%rax)
L887:
  mov    0x8(%rax),%rax
  lea    0x8(%r13),%rdx
  mov    0x8(%r13),%r13
  test   %rax,%rax
  je     L73
L327:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L887
L73:
  cmp    %r13,%r15
  je     L838
  movq   $0x0,(%rdx)
  mov    %r15,%rdi
  call   <sort_and_stuff>
  mov    %r13,%rdi
  mov    %rax,%r15
  call   <sort_and_stuff>
  mov    %r15,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%r13
L838:
  mov    %r13,%rsi
  mov    %rbx,%rdi
  call   <merge_and_stuff@plt>
  mov    %rax,%r15
L13:
  mov    0x48(%rsp),%rdx
  mov    %r14,%rax
  mov    %r14,%r13
  test   %r14,%r14
  jne    L346
  jmp    L729
  nopw   0x0(%rax,%rax,1)
L813:
  mov    0x8(%rax),%rax
  lea    0x8(%r13),%rdx
  mov    0x8(%r13),%r13
  test   %rax,%rax
  je     L154
L346:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L813
L154:
  cmp    %r13,%r14
  je     L729
  movq   $0x0,(%rdx)
  mov    %r14,%rax
  mov    0x80(%rsp),%rdx
  mov    %r14,%rbx
  jmp    L510
  nopw   0x0(%rax,%rax,1)
L53:
  mov    0x8(%rax),%rax
  lea    0x8(%rbx),%rdx
  mov    0x8(%rbx),%rbx
  test   %rax,%rax
  je     L20
L510:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L53
L20:
  cmp    %rbx,%r14
  je     L947
  movq   $0x0,(%rdx)
  mov    %r14,%rdi
  call   <sort_and_stuff>
  mov    %rbx,%rdi
  mov    %rax,%r14
  call   <sort_and_stuff>
  mov    %r14,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbx
L947:
  mov    0x98(%rsp),%rdx
  mov    %r13,%rax
  mov    %r13,%r14
  test   %r13,%r13
  jne    L766
  jmp    L504
  nopl   0x0(%rax)
L114:
  mov    0x8(%rax),%rax
  lea    0x8(%r14),%rdx
  mov    0x8(%r14),%r14
  test   %rax,%rax
  je     L439
L766:
  mov    0x8(%rax),%rax
  test   %rax,%rax
  jne    L114
L439:
  cmp    %r14,%r13
  je     L504
  movq   $0x0,(%rdx)
  mov    %r13,%rdi
  call   <sort_and_stuff>
  mov    %r14,%rdi
  mov    %rax,%r13
  call   <sort_and_stuff>
  mov    %r13,%rdi
  mov    %rax,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%r14
L504:
  mov    %r14,%rsi
  mov    %rbx,%rdi
  call   <merge_and_stuff@plt>
  mov    %rax,%r13
L729:
  mov    %r13,%rsi
  mov    %r15,%rdi
  call   <merge_and_stuff@plt>
  mov    %rax,%r13
L956:
  mov    %rbp,%rdi
  mov    %r13,%rsi
  call   <merge_and_stuff@plt>
  mov    %rax,%rbp
L160:
  add    $0xa8,%rsp
  mov    %rbp,%rsi
  mov    %r12,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <merge_and_stuff@plt>
  nopl   (%rax)
L226:
  add    $0xa8,%rsp
  mov    %rbp,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
unsigned *sort_and_stuff(unsigned *lst) {
  unsigned *tort, **ptort, *hare, *la, *lb;
  hare = tort = lst;
  while (hare != 0 && (((unsigned **)hare)[1]) != 0) {
    hare = (((unsigned **)(((unsigned **)hare)[1]))[1]);
    ptort = &(((unsigned **)tort)[1]);
    tort = (((unsigned **)tort)[1]);
  }
  if (tort == lst)
    return lst;
  *ptort = 0;
  la = sort_and_stuff(lst);
  lb = sort_and_stuff(tort);
  return merge_and_stuff(la, lb);
}
```