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

```asm
<pthread_qsort_split>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %rdx,-0x48(%rbp)
  mov    %rcx,-0x50(%rbp)
  mov    %r8,-0x58(%rbp)
  mov    %r9,-0x60(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x40(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L75:
  cmp    %rdx,%rsp
  je     L140
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L75
L140:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L20
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L20:
  mov    %rsp,%rax
  add    $0xf,%rax
  shr    $0x4,%rax
  shl    $0x4,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x48(%rbp),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  shr    %rax
  mov    %rax,-0x10(%rbp)
  mov    -0x48(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rcx
  mov    -0x10(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rdx
  mov    -0x60(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rdx,%rdi
  call   *%rax
  test   %eax,%eax
  jns    L13
  mov    -0x48(%rbp),%rcx
  mov    -0x10(%rbp),%rdx
  mov    -0x40(%rbp),%rsi
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <pthread_qsort_swap@plt>
L13:
  mov    -0x48(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rcx
  mov    -0x50(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rdx
  mov    -0x60(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rdx,%rdi
  call   *%rax
  test   %eax,%eax
  jns    L48
  mov    -0x48(%rbp),%rcx
  mov    -0x50(%rbp),%rdx
  mov    -0x40(%rbp),%rsi
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <pthread_qsort_swap@plt>
L48:
  mov    -0x10(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rcx
  mov    -0x50(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rdx
  mov    -0x60(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rdx,%rdi
  call   *%rax
  test   %eax,%eax
  jns    L66
  mov    -0x10(%rbp),%rcx
  mov    -0x50(%rbp),%rdx
  mov    -0x40(%rbp),%rsi
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <pthread_qsort_swap@plt>
L66:
  mov    -0x10(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rcx
  mov    -0x40(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x50(%rbp),%rax
  lea    -0x1(%rax),%rcx
  mov    -0x10(%rbp),%rdx
  mov    -0x40(%rbp),%rsi
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <pthread_qsort_swap@plt>
  mov    -0x48(%rbp),%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x50(%rbp),%rax
  sub    $0x1,%rax
  mov    %rax,-0x20(%rbp)
  movw   $0x0,-0x2a(%rbp)
  jmp    L135
L78:
  addq   $0x1,-0x28(%rbp)
  jmp    L70
L40:
  addq   $0x1,-0x28(%rbp)
L70:
  mov    -0x28(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rcx
  mov    -0x18(%rbp),%rax
  mov    -0x60(%rbp),%rdx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   *%rdx
  test   %eax,%eax
  js     L40
  subq   $0x1,-0x20(%rbp)
  jmp    L77
L116:
  subq   $0x1,-0x20(%rbp)
L77:
  mov    -0x20(%rbp),%rax
  imul   -0x40(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rcx
  mov    -0x18(%rbp),%rax
  mov    -0x60(%rbp),%rdx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   *%rdx
  test   %eax,%eax
  jg     L116
  mov    -0x28(%rbp),%rax
  cmp    -0x20(%rbp),%rax
  jae    L19
  mov    -0x20(%rbp),%rcx
  mov    -0x28(%rbp),%rdx
  mov    -0x40(%rbp),%rsi
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <pthread_qsort_swap@plt>
  jmp    L135
L19:
  movw   $0x1,-0x2a(%rbp)
L135:
  cmpw   $0x0,-0x2a(%rbp)
  je     L78
  mov    -0x50(%rbp),%rax
  lea    -0x1(%rax),%rcx
  mov    -0x28(%rbp),%rdx
  mov    -0x40(%rbp),%rsi
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <pthread_qsort_swap@plt>
  mov    -0x58(%rbp),%rax
  mov    -0x28(%rbp),%rdx
  mov    %rdx,(%rax)
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L88
  call   <__stack_chk_fail@plt>
L88:
  leave
  ret
```

assistant: ```c
void pthread_qsort_split(void *base, const size_t width, const size_t first, const size_t last, size_t *middle, int (*compare)(const void *, const void *)) {
  short done;
  size_t ii, jj, temp_middle;
  void *test_temp;
  test_temp = alloca(width);
  temp_middle = (first + last) / 2;
  if (compare((void *)((size_t)base + (temp_middle * width)), (void *)((size_t)base + (first * width))) < 0) {
    pthread_qsort_swap(base, width, temp_middle, first);
  }
  if (compare((void *)((size_t)base + (last * width)), (void *)((size_t)base + (first * width))) < 0) {
    pthread_qsort_swap(base, width, last, first);
  }
  if (compare((void *)((size_t)base + (last * width)), (void *)((size_t)base + (temp_middle * width))) < 0) {
    pthread_qsort_swap(base, width, last, temp_middle);
  }
  (void)memcpy(test_temp, (void *)((size_t)base + (temp_middle * width)), width);
  pthread_qsort_swap(base, width, temp_middle, (last - 1));
  ii = first;
  jj = last - 1;
  done = 0;
  while (done == 0) {
    ii++;
    while (compare((void *)((size_t)base + (ii * width)), test_temp) < 0) {
      ii++;
    }
    jj--;
    while (compare((void *)((size_t)base + (jj * width)), test_temp) > 0) {
      jj--;
    }
    if (ii < jj) {
      pthread_qsort_swap(base, width, ii, jj);
    } else {
      done = 1;
    }
  }
  pthread_qsort_swap(base, width, ii, (last - 1));
  (*middle) = ii;
  return;
}
```