user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<reverse>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %esi,-0x6c(%rbp)
  mov    %edx,-0x70(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%r13
  mov    -0x70(%rbp),%ebx
  movslq %ebx,%rax
  mov    %rax,-0x80(%rbp)
  movq   $0x0,-0x78(%rbp)
  movslq %ebx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x58(%rbp)
  movslq %ebx,%rax
  mov    %rax,-0x90(%rbp)
  movq   $0x0,-0x88(%rbp)
  movslq %ebx,%rax
  mov    %rax,%r10
  mov    $0x0,%r11d
  movslq %ebx,%r12
  mov    -0x68(%rbp),%rax
  mov    %rax,-0x50(%rbp)
  movslq %ebx,%rax
  mov    %rax,%r8
  mov    $0x0,%r9d
  movslq %ebx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L14:
  cmp    %rdx,%rsp
  je     L17
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L14
L17:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L8
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L8:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x48(%rbp)
  mov    -0x6c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0x60(%rbp)
  movl   $0x0,-0x5c(%rbp)
  jmp    L7
L82:
  movslq %ebx,%rax
  mov    %rax,%r14
  mov    $0x0,%r15d
  movslq %ebx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  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
L58:
  cmp    %rdx,%rsp
  je     L61
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L58
L61:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L39
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L39:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x60(%rbp),%eax
  movslq %eax,%rdx
  movslq %ebx,%rax
  imul   %rax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  mov    -0x48(%rbp),%rax
  mov    %rdx,%rcx
  mov    %r12,%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rdx
  movslq %ebx,%rax
  imul   %rax,%rdx
  mov    -0x50(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x60(%rbp),%eax
  movslq %eax,%rdx
  movslq %ebx,%rax
  imul   %rax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    %r12,%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x5c(%rbp),%eax
  movslq %eax,%rdx
  movslq %ebx,%rax
  imul   %rax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rax,%rdx
  mov    -0x48(%rbp),%rax
  mov    %rdx,%rcx
  mov    %r12,%rdx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    %rax,%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,%rcx
  mov    %r12,%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  subl   $0x1,-0x60(%rbp)
  addl   $0x1,-0x5c(%rbp)
L7:
  mov    -0x6c(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  cmp    %eax,-0x5c(%rbp)
  jl     L82
  mov    %r13,%rsp
  nop
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L62
  call   <__stack_chk_fail@plt>
L62:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void reverse(void *x, int y, int z) {
  struct {
    char w[z];
  } *p = x, a;
  int i, j;
  for (i = y - 1, j = 0; j < y / 2; i--, j++)
    ({
      a = p[i];
      p[i] = p[j];
      p[j] = a;
    });
}
```