user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<predict_4x4_dc>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %ecx,-0x30(%rbp)
  mov    %r8d,-0x3c(%rbp)
  movl   $0x0,-0x1c(%rbp)
  mov    -0x30(%rbp),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x30(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x10(%rbp)
  movl   $0x80808080,-0x20(%rbp)
  mov    -0x3c(%rbp),%eax
  sar    $0x4,%eax
  and    $0x3,%eax
  test   %eax,%eax
  setne  %al
  movzbl %al,%eax
  mov    %eax,-0xc(%rbp)
  mov    -0x3c(%rbp),%eax
  sar    $0x8,%eax
  test   %eax,%eax
  setne  %al
  movzbl %al,%eax
  mov    %eax,-0x8(%rbp)
  mov    -0x3c(%rbp),%eax
  and    $0x3,%eax
  mov    %eax,-0x4(%rbp)
  mov    -0xc(%rbp),%eax
  add    %eax,%eax
  or     -0x8(%rbp),%eax
  or     %eax,-0x4(%rbp)
  cmpl   $0x3,-0x4(%rbp)
  je     L34
  cmpl   $0x3,-0x4(%rbp)
  jg     L37
  cmpl   $0x1,-0x4(%rbp)
  je     L27
  cmpl   $0x2,-0x4(%rbp)
  je     L61
  jmp    L37
L34:
  mov    $0xffffffff,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%edx
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    -0x2c(%rbp),%eax
  add    %eax,%eax
  sub    $0x1,%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x2c(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  sub    $0x1,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  lea    (%rcx,%rax,1),%edx
  mov    -0x2c(%rbp),%eax
  neg    %eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    $0x1,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    $0x2,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    $0x3,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %edx,%eax
  add    $0x4,%eax
  sar    $0x3,%eax
  imul   $0x1010101,%eax,%eax
  mov    %eax,-0x20(%rbp)
  jmp    L14
L61:
  mov    $0xffffffff,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%edx
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    -0x2c(%rbp),%eax
  add    %eax,%eax
  sub    $0x1,%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x2c(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  sub    $0x1,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %ecx,%eax
  add    $0x2,%eax
  sar    $0x2,%eax
  imul   $0x1010101,%eax,%eax
  mov    %eax,-0x20(%rbp)
  jmp    L14
L27:
  mov    -0x2c(%rbp),%eax
  neg    %eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%edx
  mov    $0x1,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    $0x2,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %eax,%edx
  mov    $0x3,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %edx,%eax
  add    $0x2,%eax
  sar    $0x2,%eax
  imul   $0x1010101,%eax,%eax
  mov    %eax,-0x20(%rbp)
  jmp    L14
L37:
  nop
L14:
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    -0x20(%rbp),%edx
  mov    %edx,(%rax)
  mov    -0x14(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x38(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x18(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x38(%rbp),%rax
  add    %rcx,%rax
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  mov    -0x1c(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x38(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void predict_4x4_dc(unsigned char *src, unsigned int src_stride, unsigned char *dst, unsigned int dst_stride, int neighbour) {
  const int dst_row_0 = 0;
  const int dst_row_1 = dst_stride;
  const int dst_row_2 = dst_stride * 2;
  const int dst_row_3 = dst_row_1 + dst_row_2;
  unsigned int dc = 0x80808080;
  int left = (((neighbour >> 4) & 3) != 0);
  int top = ((neighbour >> 8) != 0);
  int imode = neighbour & 3;
  imode |= ((left << 1) | top);
  switch (imode) {
  case 3:
    dc = ((src[-1 + 0 * src_stride] + src[-1 + src_stride] + src[-1 + 2 * src_stride] + src[-1 + 3 * src_stride] + src[0 - src_stride] + src[1 - src_stride] + src[2 - src_stride] + src[3 - src_stride] + 4) >> 3) * 0x01010101;
    break;
  case 2:
    dc = ((src[-1 + 0 * src_stride] + src[-1 + src_stride] + src[-1 + 2 * src_stride] + src[-1 + 3 * src_stride] + 2) >> 2) * 0x01010101;
    break;
  case 1:
    dc = ((src[0 - src_stride] + src[1 - src_stride] + src[2 - src_stride] + src[3 - src_stride] + 2) >> 2) * 0x01010101;
    break;
  default:
    break;
  }
  *(unsigned int *)&dst[dst_row_0] = *(unsigned int *)&dst[dst_row_1] = *(unsigned int *)&dst[dst_row_2] = *(unsigned int *)&dst[dst_row_3] = dc;
}
```