user: 这段汇编代码用C语言表示是什么样的？

```asm
<update>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %edi,-0x14(%rbp)
  mov    %esi,-0x18(%rbp)
  mov    %rdx,-0x20(%rbp)
  mov    %rcx,-0x28(%rbp)
  movl   $0x1,-0xc(%rbp)
  jmp    L33
L28:
  movl   $0x1,-0x8(%rbp)
  jmp    L24
L21:
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  sub    $0x1,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x20(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    $0x1,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    %eax,%ecx
  mov    -0xc(%rbp),%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  sub    $0x1,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    %eax,%ecx
  mov    -0xc(%rbp),%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    $0x1,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    %eax,%ecx
  mov    -0xc(%rbp),%eax
  add    $0x1,%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  sub    $0x1,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    %eax,%ecx
  mov    -0xc(%rbp),%eax
  add    $0x1,%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    %eax,%ecx
  mov    -0xc(%rbp),%eax
  add    $0x1,%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    $0x1,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  add    %ecx,%eax
  mov    %eax,-0x4(%rbp)
  cmpl   $0x2,-0x4(%rbp)
  sete   %al
  movzbl %al,%edx
  mov    -0xc(%rbp),%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x20(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  mov    %edx,%ecx
  imul   %eax,%ecx
  cmpl   $0x3,-0x4(%rbp)
  sete   %al
  movzbl %al,%edx
  mov    -0xc(%rbp),%eax
  imul   -0x18(%rbp),%eax
  mov    %eax,%esi
  mov    -0x8(%rbp),%eax
  add    %esi,%eax
  cltq
  lea    0x0(,%rax,4),%rsi
  mov    -0x28(%rbp),%rax
  add    %rsi,%rax
  add    %ecx,%edx
  mov    %edx,(%rax)
  addl   $0x1,-0x8(%rbp)
L24:
  mov    -0x18(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x8(%rbp)
  jl     L21
  addl   $0x1,-0xc(%rbp)
L33:
  mov    -0x14(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0xc(%rbp)
  jl     L28
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void update(int Nrows, int Ncolumns, int *board, int *newboard) {
  int r, c;
  for (r = 1; r < Nrows - 1; ++r) {
    for (c = 1; c < Ncolumns - 1; ++c) {
      int s = board[((r - 1) * Ncolumns + (c - 1))] + board[((r - 1) * Ncolumns + (c - 0))] + board[((r - 1) * Ncolumns + (c + 1))] + board[((r + 0) * Ncolumns + (c - 1))] + board[((r + 0) * Ncolumns + (c + 1))] + board[((r + 1) * Ncolumns + (c - 1))] + board[((r + 1) * Ncolumns + (c - 0))] + board[((r + 1) * Ncolumns + (c + 1))];
      newboard[((r)*Ncolumns + (c))] = (s < 2) * 0 + (s == 2) * board[((r)*Ncolumns + (c))] + (s == 3) * 1 + (s > 3) * 0;
    }
  }
}
```