user: 这段汇编代码用C语言表示是什么样的？

```asm
<RC2_decrypt>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  mov    %rdi,-0x40(%rbp)
  mov    %rsi,-0x48(%rbp)
  mov    -0x40(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x30(%rbp),%rax
  movzwl %ax,%r12d
  mov    -0x30(%rbp),%rax
  shr    $0x10,%rax
  mov    %eax,%r15d
  mov    -0x40(%rbp),%rax
  mov    0x8(%rax),%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x30(%rbp),%rax
  movzwl %ax,%ebx
  mov    -0x30(%rbp),%rax
  shr    $0x10,%rax
  mov    %eax,%r14d
  movl   $0x3,-0x34(%rbp)
  movl   $0x5,-0x38(%rbp)
  mov    -0x48(%rbp),%rax
  mov    (%rax),%rax
  lea    0xfc(%rax),%r13
  mov    -0x48(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,%r8
L10:
  mov    %r14d,%edx
  shl    $0xb,%edx
  mov    %r14d,%eax
  sar    $0x5,%eax
  or     %edx,%eax
  movzwl %ax,%edi
  mov    %ebx,%eax
  not    %eax
  and    %r12d,%eax
  mov    %eax,%edx
  mov    %edi,%eax
  sub    %edx,%eax
  mov    %r15d,%ecx
  and    %ebx,%ecx
  sub    %ecx,%eax
  mov    %eax,%edx
  mov    %r13,%rax
  lea    -0x4(%rax),%r13
  mov    (%rax),%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  movzwl %ax,%r14d
  mov    %ebx,%edx
  shl    $0xd,%edx
  mov    %ebx,%eax
  sar    $0x3,%eax
  or     %edx,%eax
  movzwl %ax,%edi
  mov    %r15d,%eax
  not    %eax
  and    %r14d,%eax
  mov    %eax,%edx
  mov    %edi,%eax
  sub    %edx,%eax
  mov    %r12d,%ecx
  and    %r15d,%ecx
  sub    %ecx,%eax
  mov    %eax,%edx
  mov    %r13,%rax
  lea    -0x4(%rax),%r13
  mov    (%rax),%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  movzwl %ax,%ebx
  mov    %r15d,%edx
  shl    $0xe,%edx
  mov    %r15d,%eax
  sar    $0x2,%eax
  or     %edx,%eax
  movzwl %ax,%edi
  mov    %r12d,%eax
  not    %eax
  and    %ebx,%eax
  mov    %eax,%edx
  mov    %edi,%eax
  sub    %edx,%eax
  mov    %r14d,%ecx
  and    %r12d,%ecx
  sub    %ecx,%eax
  mov    %eax,%edx
  mov    %r13,%rax
  lea    -0x4(%rax),%r13
  mov    (%rax),%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  movzwl %ax,%r15d
  mov    %r12d,%edx
  shl    $0xf,%edx
  mov    %r12d,%eax
  sar    %eax
  or     %edx,%eax
  movzwl %ax,%esi
  mov    %r14d,%eax
  not    %eax
  and    %r15d,%eax
  mov    %eax,%edx
  mov    %esi,%eax
  sub    %edx,%eax
  mov    %ebx,%ecx
  and    %r14d,%ecx
  sub    %ecx,%eax
  mov    %eax,%edx
  mov    %r13,%rax
  lea    -0x4(%rax),%r13
  mov    (%rax),%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  movzwl %ax,%r12d
  subl   $0x1,-0x38(%rbp)
  cmpl   $0x0,-0x38(%rbp)
  jne    L10
  subl   $0x1,-0x34(%rbp)
  cmpl   $0x0,-0x34(%rbp)
  je     L3
  cmpl   $0x2,-0x34(%rbp)
  jne    L21
  mov    $0x6,%eax
  jmp    L17
L21:
  mov    $0x5,%eax
L17:
  mov    %eax,-0x38(%rbp)
  movslq %ebx,%rax
  and    $0x3f,%eax
  shl    $0x2,%rax
  mov    %r8,%rsi
  add    %rsi,%rax
  mov    (%rax),%edx
  mov    %r14d,%eax
  sub    %edx,%eax
  movzwl %ax,%r14d
  movslq %r15d,%rax
  and    $0x3f,%eax
  shl    $0x2,%rax
  add    %rsi,%rax
  mov    (%rax),%edx
  mov    %ebx,%eax
  sub    %edx,%eax
  movzwl %ax,%ebx
  movslq %r12d,%rax
  and    $0x3f,%eax
  shl    $0x2,%rax
  add    %rsi,%rax
  mov    (%rax),%edx
  mov    %r15d,%eax
  sub    %edx,%eax
  movzwl %ax,%r15d
  movslq %r14d,%rax
  and    $0x3f,%eax
  shl    $0x2,%rax
  add    %rsi,%rax
  mov    (%rax),%edx
  mov    %r12d,%eax
  sub    %edx,%eax
  movzwl %ax,%r12d
  jmp    L10
L3:
  nop
  movzwl %r12w,%eax
  mov    %r15d,%edx
  shl    $0x10,%edx
  or     %edx,%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,(%rax)
  movzwl %bx,%eax
  mov    %r14d,%edx
  shl    $0x10,%edx
  or     %edx,%eax
  mov    %eax,%ecx
  mov    -0x40(%rbp),%rax
  lea    0x8(%rax),%rdx
  movslq %ecx,%rax
  mov    %rax,(%rdx)
  nop
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void RC2_decrypt(unsigned long *d, RC2_KEY *key) {
  int i, n;
  register RC2_INT *p0, *p1;
  register RC2_INT x0, x1, x2, x3, t;
  unsigned long l;
  l = d[0];
  x0 = (RC2_INT)l & 0xffff;
  x1 = (RC2_INT)(l >> 16L);
  l = d[1];
  x2 = (RC2_INT)l & 0xffff;
  x3 = (RC2_INT)(l >> 16L);
  n = 3;
  i = 5;
  p0 = &(key->data[63]);
  p1 = &(key->data[0]);
  for (;;) {
    t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
    x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
    t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
    x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
    t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
    x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
    t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
    x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
    if (--i == 0) {
      if (--n == 0)
        break;
      i = (n == 2) ? 6 : 5;
      x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
      x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
      x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
      x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
    }
  }
  d[0] = (RC2_INT)(x0 & 0xffff) | ((RC2_INT)(x1 & 0xffff) << 16L);
  d[1] = (RC2_INT)(x2 & 0xffff) | ((RC2_INT)(x3 & 0xffff) << 16L);
}
```