user: 下面的汇编指令对应的C源代码是什么：

```asm
<transformation_D2>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %rdx,-0x48(%rbp)
  mov    %rcx,-0x50(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rsi
  movl   $0x10,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cltq
  sub    $0x1,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cltq
  mov    %rax,%r10
  mov    $0x0,%r11d
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cltq
  mov    %rax,%r8
  mov    $0x0,%r9d
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cltq
  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
L32:
  cmp    %rdx,%rsp
  je     L149
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L32
L149:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L254
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L254:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x10(%rbp)
  movb   $0x0,-0x23(%rbp)
  movb   $0x0,-0x22(%rbp)
  movb   $0x0,-0x21(%rbp)
  movl   $0x0,-0x20(%rbp)
  jmp    L315
L195:
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x50(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  mov    %cl,(%rdx,%rax,1)
  addl   $0x1,-0x20(%rbp)
L315:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L195
  movl   $0x0,-0x20(%rbp)
  jmp    L325
L38:
  cmpl   $0x0,-0x20(%rbp)
  jne    L339
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  add    %eax,%eax
  jmp    L223
L339:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  add    %eax,%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  sub    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    $0x7,%al
  or     %ecx,%eax
L223:
  mov    %al,-0x23(%rbp)
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  sub    $0x1,%eax
  cmp    %eax,-0x20(%rbp)
  jne    L286
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  jmp    L289
L286:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  add    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  shl    $0x7,%eax
  or     %ecx,%eax
L289:
  mov    %al,-0x22(%rbp)
  movzbl -0x23(%rbp),%eax
  xor    -0x22(%rbp),%al
  mov    %al,-0x21(%rbp)
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x48(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  xor    %ecx,%eax
  mov    -0x20(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x38(%rbp),%rdx
  add    %rcx,%rdx
  xor    -0x21(%rbp),%al
  mov    %al,(%rdx)
  addl   $0x1,-0x20(%rbp)
L325:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L38
  movl   $0x0,-0x20(%rbp)
  jmp    L143
L20:
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x38(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  mov    %cl,(%rdx,%rax,1)
  addl   $0x1,-0x20(%rbp)
L143:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L20
  movl   $0x0,-0x20(%rbp)
  jmp    L134
L266:
  cmpl   $0x0,-0x20(%rbp)
  jne    L265
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  add    %eax,%eax
  jmp    L235
L265:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  add    %eax,%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  sub    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    $0x7,%al
  or     %ecx,%eax
L235:
  mov    %al,-0x23(%rbp)
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  sub    $0x1,%eax
  cmp    %eax,-0x20(%rbp)
  jne    L125
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  jmp    L203
L125:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  add    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  shl    $0x7,%eax
  or     %ecx,%eax
L203:
  mov    %al,-0x22(%rbp)
  movzbl -0x23(%rbp),%eax
  xor    -0x22(%rbp),%al
  mov    %al,-0x21(%rbp)
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x50(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  xor    %ecx,%eax
  mov    -0x20(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x40(%rbp),%rdx
  add    %rcx,%rdx
  xor    -0x21(%rbp),%al
  mov    %al,(%rdx)
  addl   $0x1,-0x20(%rbp)
L134:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L266
  movl   $0x0,-0x20(%rbp)
  jmp    L101
L99:
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x40(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  mov    %cl,(%rdx,%rax,1)
  addl   $0x1,-0x20(%rbp)
L101:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L99
  movl   $0x0,-0x20(%rbp)
  jmp    L52
L48:
  cmpl   $0x0,-0x20(%rbp)
  jne    L199
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  add    %eax,%eax
  jmp    L135
L199:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  add    %eax,%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  sub    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    $0x7,%al
  or     %ecx,%eax
L135:
  mov    %al,-0x23(%rbp)
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  sub    $0x1,%eax
  cmp    %eax,-0x20(%rbp)
  jne    L345
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  jmp    L330
L345:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  add    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  shl    $0x7,%eax
  or     %ecx,%eax
L330:
  mov    %al,-0x22(%rbp)
  movzbl -0x23(%rbp),%eax
  xor    -0x22(%rbp),%al
  mov    %al,-0x21(%rbp)
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x38(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  xor    %ecx,%eax
  mov    -0x20(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x48(%rbp),%rdx
  add    %rcx,%rdx
  xor    -0x21(%rbp),%al
  mov    %al,(%rdx)
  addl   $0x1,-0x20(%rbp)
L52:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L48
  movl   $0x0,-0x20(%rbp)
  jmp    L267
L218:
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x48(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  mov    %cl,(%rdx,%rax,1)
  addl   $0x1,-0x20(%rbp)
L267:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L218
  movl   $0x0,-0x20(%rbp)
  jmp    L253
L170:
  cmpl   $0x0,-0x20(%rbp)
  jne    L169
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  add    %eax,%eax
  jmp    L298
L169:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  add    %eax,%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  sub    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    $0x7,%al
  or     %ecx,%eax
L298:
  mov    %al,-0x23(%rbp)
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  sub    $0x1,%eax
  cmp    %eax,-0x20(%rbp)
  jne    L73
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  jmp    L205
L73:
  mov    -0x10(%rbp),%rdx
  mov    -0x20(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  shr    %al
  mov    %eax,%ecx
  mov    -0x20(%rbp),%eax
  add    $0x1,%eax
  mov    -0x10(%rbp),%rdx
  cltq
  movzbl (%rdx,%rax,1),%eax
  movzbl %al,%eax
  shl    $0x7,%eax
  or     %ecx,%eax
L205:
  mov    %al,-0x22(%rbp)
  movzbl -0x23(%rbp),%eax
  xor    -0x22(%rbp),%al
  mov    %al,-0x21(%rbp)
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x40(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  mov    %edx,%ecx
  xor    %eax,%ecx
  mov    -0x20(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  xor    %ecx,%eax
  mov    -0x20(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x50(%rbp),%rdx
  add    %rcx,%rdx
  xor    -0x21(%rbp),%al
  mov    %al,(%rdx)
  addl   $0x1,-0x20(%rbp)
L253:
  mov    -0x1c(%rbp),%eax
  lea    0x7(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x3,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L170
  mov    %rsi,%rsp
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L194
  call   <__stack_chk_fail@plt>
L194:
  leave
  ret
```

assistant: ```c
void transformation_D2(unsigned char *x0, unsigned char *x1, unsigned char *x2, unsigned char *x3) {
  const int LEN = 16;
  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[i] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 1 : (temp[i] >> 1) | (temp[i + 1] << 7);
    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[i] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 1 : (temp[i] >> 1) | (temp[i + 1] << 7);
    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[i] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 1 : (temp[i] >> 1) | (temp[i + 1] << 7);
    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[i] << 1 : (temp[i] << 1) | (temp[i - 1] >> 7);
    extR = i == LEN / 8 - 1 ? temp[i] >> 1 : (temp[i] >> 1) | (temp[i + 1] << 7);
    L = extL ^ extR;
    x3[i] = x3[i] ^ x1[i] ^ x2[i] ^ L;
  }
}
```