user: 下面的汇编指令对应的C源代码是什么:

```asm
<merge_sort>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %rdx,0x10(%rsp)
  cmp    $0x1,%esi
  jle    L72
  mov    %esi,%r15d
  mov    %esi,%r14d
  mov    %rdi,%rbp
  sar    %r15d
  lea    0x0(,%r15,8),%ebx
  sub    %r15d,%r14d
  mov    %r15d,0x18(%rsp)
  mov    %ebx,%edi
  lea    0x0(,%r14,8),%r12d
  mov    %r14d,0x1c(%rsp)
  call   <malloc@plt>
  mov    %r12d,%edi
  mov    %rax,%r13
  call   <malloc@plt>
  mov    %rbp,%rsi
  mov    %ebx,%edx
  mov    %r13,%rdi
  mov    %rax,(%rsp)
  call   <memcpy@plt>
  mov    %r12d,%edx
  mov    (%rsp),%r12
  movslq %r15d,%rax
  lea    0x0(%rbp,%rax,8),%rsi
  mov    %r12,%rdi
  call   <memcpy@plt>
  mov    0x10(%rsp),%rbp
  mov    %r15d,%esi
  mov    %r13,%rdi
  mov    %rbp,%rdx
  call   <merge_sort>
  mov    %rbp,%rdx
  mov    %r14d,%esi
  mov    %r12,%rdi
  call   <merge_sort>
  test   %r14d,%r14d
  jle    L1
  mov    $0x1,%r14d
  xor    %ebx,%ebx
  xor    %r12d,%r12d
  jmp    L21
  nop
L56:
  mov    0x0(%rbp),%rax
  add    $0x1,%ebx
L108:
  mov    0x8(%rsp),%rdx
  mov    %rax,-0x8(%rdx,%r14,8)
  add    $0x1,%r14
  cmp    0x18(%rsp),%r12d
  jge    L86
  cmp    0x1c(%rsp),%ebx
  jge    L19
L21:
  mov    (%rsp),%rcx
  movslq %ebx,%rax
  lea    (%rcx,%rax,8),%rbp
  movslq %r12d,%rax
  lea    0x0(%r13,%rax,8),%r15
  mov    0x0(%rbp),%rsi
  mov    0x10(%rsp),%rax
  mov    (%r15),%rdi
  call   *%rax
  movslq %r14d,%rsi
  test   %eax,%eax
  jg     L56
  mov    (%r15),%rax
  add    $0x1,%r12d
  jmp    L108
  nopl   0x0(%rax,%rax,1)
L72:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L19:
  mov    0x18(%rsp),%eax
  cmp    %eax,%r12d
  jl     L49
L86:
  cmp    0x1c(%rsp),%ebx
  jge    L9
  mov    0x1c(%rsp),%eax
  movslq %ebx,%rcx
  sub    %ebx,%eax
  lea    0x0(,%rax,8),%edx
  mov    (%rsp),%rax
  lea    (%rax,%rcx,8),%r8
  mov    0x8(%rsp),%rax
  lea    (%rax,%rsi,8),%rdi
  mov    %r8,%rsi
  call   <memcpy@plt>
L9:
  mov    %r13,%rdi
  call   <free@plt>
  mov    (%rsp),%rdi
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1070 <free@plt>
  nopw   0x0(%rax,%rax,1)
L49:
  sub    %r12d,%eax
  movslq %r12d,%r8
  lea    0x0(,%rax,8),%ebx
  lea    (%rdx,%rsi,8),%rax
  mov    %rax,0x8(%rsp)
  lea    0x0(%r13,%r8,8),%r8
L64:
  mov    0x8(%rsp),%rdi
  mov    %ebx,%edx
  mov    %r8,%rsi
  call   <memcpy@plt>
  jmp    L9
  nopl   0x0(%rax)
L1:
  mov    %r13,%r8
  jmp    L64
```

assistant: ```c
void merge_sort(char **strArr, int len, int (*compar)(const char *, const char *)) {
  if (len <= 1)
    return;
  int leftLen = len / 2;
  int rightLen = len - leftLen;
  char **strArrLeft = malloc(leftLen * sizeof(const char *));
  char **strArrRight = malloc(rightLen * sizeof(const char *));
  memcpy(strArrLeft, &strArr[0], leftLen * sizeof(const char *));
  memcpy(strArrRight, &strArr[leftLen], rightLen * sizeof(const char *));
  merge_sort(strArrLeft, leftLen, compar);
  merge_sort(strArrRight, rightLen, compar);
  int writeInd = 0;
  int leftInd = 0;
  int rightInd = 0;
  while (leftInd < leftLen && rightInd < rightLen) {
    int cmp = compar(strArrLeft[leftInd], strArrRight[rightInd]);
    if (cmp <= 0) {
      strArr[writeInd++] = strArrLeft[leftInd++];
    } else {
      strArr[writeInd++] = strArrRight[rightInd++];
    }
  }
  if (leftInd < leftLen) {
    memcpy(&strArr[writeInd], &strArrLeft[leftInd], (leftLen - leftInd) * sizeof(const char *));
  } else if (rightInd < rightLen) {
    memcpy(&strArr[writeInd], &strArrRight[rightInd], (rightLen - rightInd) * sizeof(const char *));
  }
  free(strArrLeft);
  free(strArrRight);
}
```