user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<transformation_D2>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %rdi,%r9
  mov    %rdx,%rdi
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
L202:
  movzbl (%rsi,%rax,1),%edx
  xor    (%rcx,%rax,1),%dl
  mov    %dl,0x4(%rsp,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L202
  lea    0x4(%rsp),%r8
  mov    %r8,%rbx
  mov    $0x0,%eax
  jmp    L124
L96:
  movzbl 0x4(%rsp),%edx
  lea    (%rdx,%rdx,1),%r10d
L157:
  movzbl (%rbx),%edx
  shr    $0x3,%dl
  movzbl 0x1(%rbx),%r11d
  shl    $0x5,%r11d
  or     %r11d,%edx
  movzbl (%r9,%rax,1),%r11d
  xor    (%rdi,%rax,1),%r11b
  xor    (%rcx,%rax,1),%r11b
  xor    %r11d,%edx
  xor    %r10d,%edx
  mov    %dl,(%r9,%rax,1)
  add    $0x1,%rax
  add    $0x1,%rbx
  cmp    $0x4,%rax
  je     L170
L124:
  test   %eax,%eax
  je     L96
  movzbl -0x1(%rbx),%r10d
  shr    $0x7,%r10b
  movzbl (%rbx),%edx
  add    %edx,%edx
  or     %edx,%r10d
  cmp    $0x3,%eax
  jne    L157
  movslq %eax,%r11
  lea    (%r9,%r11,1),%rbx
  movzbl (%rdi,%r11,1),%eax
  xor    (%rbx),%al
  movzbl 0x7(%rsp),%edx
  shr    $0x3,%dl
  xor    %edx,%eax
  xor    (%rcx,%r11,1),%al
  xor    %r10d,%eax
  mov    %al,(%rbx)
L170:
  mov    $0x0,%eax
L44:
  movzbl (%rdi,%rax,1),%edx
  xor    (%r9,%rax,1),%dl
  mov    %dl,0x4(%rsp,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L44
  mov    %r8,%rbx
  mov    $0x0,%eax
  jmp    L31
L148:
  movzbl 0x4(%rsp),%edx
  lea    (%rdx,%rdx,1),%r10d
L4:
  movzbl (%rsi,%rax,1),%edx
  xor    (%rcx,%rax,1),%dl
  xor    (%r9,%rax,1),%dl
  movzbl (%rbx),%r11d
  shr    $0x3,%r11b
  movzbl 0x1(%rbx),%ebp
  shl    $0x5,%ebp
  or     %ebp,%r11d
  xor    %r11d,%edx
  xor    %r10d,%edx
  mov    %dl,(%rsi,%rax,1)
  add    $0x1,%rax
  add    $0x1,%rbx
  cmp    $0x4,%rax
  je     L40
L31:
  test   %eax,%eax
  je     L148
  movzbl -0x1(%rbx),%r10d
  shr    $0x7,%r10b
  movzbl (%rbx),%edx
  add    %edx,%edx
  or     %edx,%r10d
  cmp    $0x3,%eax
  jne    L4
  movslq %eax,%r11
  lea    (%rsi,%r11,1),%rbx
  movzbl (%rcx,%r11,1),%eax
  xor    (%rbx),%al
  movzbl 0x7(%rsp),%edx
  shr    $0x3,%dl
  xor    %edx,%eax
  xor    (%r9,%r11,1),%al
  xor    %r10d,%eax
  mov    %al,(%rbx)
L40:
  mov    $0x0,%eax
L36:
  movzbl (%rcx,%rax,1),%edx
  xor    (%rsi,%rax,1),%dl
  mov    %dl,0x4(%rsp,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L36
  mov    %r8,%rbx
  mov    $0x0,%eax
  jmp    L11
L71:
  movzbl 0x4(%rsp),%edx
  lea    (%rdx,%rdx,1),%r10d
L88:
  movzbl (%rdi,%rax,1),%edx
  xor    (%r9,%rax,1),%dl
  xor    (%rsi,%rax,1),%dl
  movzbl (%rbx),%r11d
  shr    $0x3,%r11b
  movzbl 0x1(%rbx),%ebp
  shl    $0x5,%ebp
  or     %ebp,%r11d
  xor    %r11d,%edx
  xor    %r10d,%edx
  mov    %dl,(%rdi,%rax,1)
  add    $0x1,%rax
  add    $0x1,%rbx
  cmp    $0x4,%rax
  je     L42
L11:
  test   %eax,%eax
  je     L71
  movzbl -0x1(%rbx),%r10d
  shr    $0x7,%r10b
  movzbl (%rbx),%edx
  add    %edx,%edx
  or     %edx,%r10d
  cmp    $0x3,%eax
  jne    L88
  movslq %eax,%r11
  lea    (%rdi,%r11,1),%rbx
  movzbl (%r9,%r11,1),%eax
  xor    (%rbx),%al
  movzbl 0x7(%rsp),%edx
  shr    $0x3,%dl
  xor    %edx,%eax
  xor    (%rsi,%r11,1),%al
  xor    %r10d,%eax
  mov    %al,(%rbx)
L42:
  mov    $0x0,%eax
L50:
  movzbl (%r9,%rax,1),%edx
  xor    (%rdi,%rax,1),%dl
  mov    %dl,0x4(%rsp,%rax,1)
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L50
  mov    $0x0,%eax
  jmp    L66
L9:
  movzbl 0x4(%rsp),%ebx
  lea    (%rbx,%rbx,1),%r9d
L87:
  movzbl (%rcx,%rax,1),%edx
  xor    (%rsi,%rax,1),%dl
  xor    (%rdi,%rax,1),%dl
  movzbl (%r8),%r10d
  shr    $0x3,%r10b
  movzbl 0x1(%r8),%r11d
  shl    $0x5,%r11d
  or     %r11d,%r10d
  xor    %r10d,%edx
  xor    %r9d,%edx
  mov    %dl,(%rcx,%rax,1)
  add    $0x1,%rax
  add    $0x1,%r8
  cmp    $0x4,%rax
  je     L89
L66:
  test   %eax,%eax
  je     L9
  movzbl -0x1(%r8),%r9d
  shr    $0x7,%r9b
  movzbl (%r8),%edx
  add    %edx,%edx
  or     %edx,%r9d
  cmp    $0x3,%eax
  jne    L87
  movslq %eax,%r10
  add    %r10,%rcx
  movzbl (%rsi,%r10,1),%eax
  xor    (%rcx),%al
  movzbl 0x7(%rsp),%edx
  shr    $0x3,%dl
  xor    %edx,%eax
  xor    (%rdi,%r10,1),%al
  xor    %r9d,%eax
  mov    %al,(%rcx)
L89:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L39
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  ret
L39:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void transformation_D2(unsigned char *x0, unsigned char *x1, unsigned char *x2, unsigned char *x3) {
  const int LEN = 32;
  unsigned char temp[LEN / 8];
  int i;
  unsigned char extL = 0, extR = 0, L = 0;
  for (i = 0; i < LEN / 8; i++)
    temp[i] = x1[i] ^ x3[i];
  for (i = 0; i < LEN / 8; i++) {
    extL = i == 0 ? temp[0] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 3 : (temp[i] >> 3) | (temp[i + 1] << 5);
    L = extL ^ extR;
    x0[i] = x0[i] ^ x2[i] ^ x3[i] ^ L;
  }
  for (i = 0; i < LEN / 8; i++)
    temp[i] = x2[i] ^ x0[i];
  for (i = 0; i < LEN / 8; i++) {
    extL = i == 0 ? temp[0] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 3 : (temp[i] >> 3) | (temp[i + 1] << 5);
    L = extL ^ extR;
    x1[i] = x1[i] ^ x3[i] ^ x0[i] ^ L;
  }
  for (i = 0; i < LEN / 8; i++)
    temp[i] = x3[i] ^ x1[i];
  for (i = 0; i < LEN / 8; i++) {
    extL = i == 0 ? temp[0] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 3 : (temp[i] >> 3) | (temp[i + 1] << 5);
    L = extL ^ extR;
    x2[i] = x2[i] ^ x0[i] ^ x1[i] ^ L;
  }
  for (i = 0; i < LEN / 8; i++)
    temp[i] = x0[i] ^ x2[i];
  for (i = 0; i < LEN / 8; i++) {
    extL = i == 0 ? temp[0] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 3 : (temp[i] >> 3) | (temp[i + 1] << 5);
    L = extL ^ extR;
    x3[i] = x3[i] ^ x1[i] ^ x2[i] ^ L;
  }
}
```