user: Demonstrate the C code that generates the assembly output below:

```asm
<findAllPlain>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x3c(%rbp)
L57:
  movl   $0x0,-0x40(%rbp)
  movl   $0x0,-0x4c(%rbp)
  jmp    L76
L36:
  movl   $0x0,-0x48(%rbp)
  jmp    L82
L139:
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x3,%rax
  add    %rdx,%rax
  shl    $0x2,%rax
  mov    %rax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rax,%rdx
  mov    -0x48(%rbp),%eax
  cltq
  mov    (%rdx,%rax,4),%eax
  test   %eax,%eax
  jne    L75
  lea    -0x30(%rbp),%rcx
  mov    -0x48(%rbp),%edx
  mov    -0x4c(%rbp),%esi
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <checkspot@plt>
  mov    %eax,-0x34(%rbp)
  cmpl   $0x1,-0x34(%rbp)
  jne    L24
  movl   $0x0,-0x44(%rbp)
  jmp    L22
L71:
  addl   $0x1,-0x44(%rbp)
L22:
  mov    -0x44(%rbp),%eax
  cltq
  mov    -0x30(%rbp,%rax,4),%eax
  test   %eax,%eax
  je     L71
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x3,%rax
  add    %rdx,%rax
  shl    $0x2,%rax
  mov    %rax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rax,%rdx
  mov    -0x44(%rbp),%eax
  lea    0x1(%rax),%ecx
  mov    -0x48(%rbp),%eax
  cltq
  mov    %ecx,(%rdx,%rax,4)
  addl   $0x1,-0x40(%rbp)
  jmp    L98
L24:
  cmpl   $0x1,-0x34(%rbp)
  jle    L98
  lea    -0x30(%rbp),%rcx
  mov    -0x48(%rbp),%edx
  mov    -0x4c(%rbp),%esi
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <checkElim@plt>
  mov    %eax,-0x44(%rbp)
  cmpl   $0x0,-0x44(%rbp)
  js     L98
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x3,%rax
  add    %rdx,%rax
  shl    $0x2,%rax
  mov    %rax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rax,%rdx
  mov    -0x44(%rbp),%eax
  lea    0x1(%rax),%ecx
  mov    -0x48(%rbp),%eax
  cltq
  mov    %ecx,(%rdx,%rax,4)
  addl   $0x1,-0x40(%rbp)
  jmp    L98
L75:
  nop
L98:
  addl   $0x1,-0x48(%rbp)
L82:
  cmpl   $0x8,-0x48(%rbp)
  jle    L139
  addl   $0x1,-0x4c(%rbp)
L76:
  cmpl   $0x8,-0x4c(%rbp)
  jle    L36
  addl   $0x1,-0x3c(%rbp)
  cmpl   $0x0,-0x40(%rbp)
  jg     L57
  movl   $0x0,-0x38(%rbp)
  movl   $0x0,-0x4c(%rbp)
  jmp    L91
L147:
  movl   $0x0,-0x48(%rbp)
  jmp    L55
L116:
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  mov    %rdx,%rax
  shl    $0x3,%rax
  add    %rdx,%rax
  shl    $0x2,%rax
  mov    %rax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rax,%rdx
  mov    -0x48(%rbp),%eax
  cltq
  mov    (%rdx,%rax,4),%eax
  test   %eax,%eax
  jne    L174
  addl   $0x1,-0x38(%rbp)
L174:
  addl   $0x1,-0x48(%rbp)
L55:
  cmpl   $0x8,-0x48(%rbp)
  jle    L116
  addl   $0x1,-0x4c(%rbp)
L91:
  cmpl   $0x8,-0x4c(%rbp)
  jle    L147
  mov    -0x38(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L123
  call   <__stack_chk_fail@plt>
L123:
  leave
  ret
```

assistant: ```c
int findAllPlain(int x[9][9]) {
  int possible_mask[9];
  int num_possible;
  int i, j, k;
  int num_found;
  int rounds = 0;
  do {
    num_found = 0;
    for (i = 0; i < 9; i++) {
      for (j = 0; j < 9; j++) {
        if (x[i][j] != 0)
          continue;
        num_possible = checkspot(x, i, j, possible_mask);
        if (num_possible == 1) {
          for (k = 0; possible_mask[k] == 0; k++)
            ;
          x[i][j] = k + 1;
          num_found++;
        } else if (num_possible > 1) {
          k = checkElim(x, i, j, possible_mask);
          if (k >= 0) {
            x[i][j] = k + 1;
            num_found++;
          }
        }
      }
    }
    rounds++;
  } while (num_found > 0);
  int num_empty = 0;
  for (i = 0; i < 9; i++)
    for (j = 0; j < 9; j++)
      if (x[i][j] == 0)
        num_empty++;
  return num_empty;
}
```