user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<findBlock>:
  endbr64
  mov    %rdi,%rdx
  mov    %rdi,%rax
  mov    $0x0,%ecx
  mov    $0x78,%r11d
  jmp    L277
L375:
  add    $0x1,%edi
  movzbl 0x2(%rax),%r10d
  cmp    $0x78,%r10b
  jne    L82
L85:
  add    $0x1,%edi
  mov    %r11d,%r10d
L82:
  cmp    $0x2,%edi
  jne    L50
  cmp    $0x20,%r8b
  je     L330
  cmp    $0x20,%r9b
  je     L20
  cmp    $0x20,%r10b
  je     L377
L50:
  add    $0x3,%rax
  add    $0x3,%ecx
  cmp    $0x9,%ecx
  je     L275
L277:
  mov    %ecx,%esi
  movzbl (%rax),%r8d
  cmp    $0x78,%r8b
  sete   %dil
  movzbl %dil,%edi
  movzbl 0x1(%rax),%r9d
  cmp    $0x78,%r9b
  je     L375
  cmpb   $0x78,0x2(%rax)
  jne    L50
  jmp    L85
L20:
  add    $0x1,%esi
L330:
  mov    %esi,%eax
  ret
L377:
  add    $0x2,%esi
  jmp    L330
L275:
  push   %rbx
  mov    $0x0,%eax
  mov    $0x78,%ebx
  jmp    L350
L272:
  add    $0x1,%ecx
  lea    0x6(%rax),%r11d
  movzbl 0x6(%rdx,%rax,1),%r9d
  cmp    $0x78,%r9b
  jne    L425
L80:
  add    $0x1,%ecx
  mov    %ebx,%r9d
L425:
  cmp    $0x2,%ecx
  jne    L240
  cmp    $0x20,%dil
  je     L49
  cmp    $0x20,%r8b
  je     L383
  cmp    $0x20,%r9b
  je     L354
L240:
  add    $0x1,%rax
  cmp    $0x3,%rax
  je     L24
L350:
  mov    %eax,%esi
  movzbl (%rdx,%rax,1),%edi
  cmp    $0x78,%dil
  sete   %cl
  movzbl %cl,%ecx
  lea    0x3(%rax),%r10d
  movzbl 0x3(%rdx,%rax,1),%r8d
  cmp    $0x78,%r8b
  je     L272
  lea    0x6(%rax),%r11d
  cmpb   $0x78,0x6(%rdx,%rax,1)
  jne    L240
  jmp    L80
L24:
  movzbl (%rdx),%ecx
  cmp    $0x78,%cl
  sete   %sil
  movzbl %sil,%esi
  movzbl 0x4(%rdx),%eax
  cmp    $0x78,%al
  je     L239
  cmpb   $0x78,0x8(%rdx)
  je     L432
  movzbl 0x2(%rdx),%ecx
  cmp    $0x78,%cl
  sete   %sil
  movzbl %sil,%esi
L231:
  cmpb   $0x78,0x6(%rdx)
  jne    L33
L262:
  add    $0x1,%esi
  mov    $0x78,%edx
  jmp    L48
L239:
  add    $0x1,%esi
  movzbl 0x8(%rdx),%edi
  cmp    $0x78,%dil
  je     L432
  cmp    $0x2,%esi
  je     L260
  movzbl 0x2(%rdx),%ecx
  cmp    $0x78,%cl
  sete   %sil
  movzbl %sil,%esi
  jmp    L164
L432:
  cmp    $0x1,%esi
  jne    L177
  mov    $0x78,%edi
L260:
  mov    $0x0,%esi
  cmp    $0x20,%cl
  je     L49
  cmp    $0x20,%al
  je     L63
  cmp    $0x20,%dil
  je     L122
L177:
  movzbl 0x2(%rdx),%ecx
  cmp    $0x78,%cl
  sete   %sil
  movzbl %sil,%esi
  cmp    $0x78,%al
  jne    L231
L164:
  add    $0x1,%esi
  movzbl 0x6(%rdx),%edx
  cmp    $0x78,%dl
  je     L262
L48:
  cmp    $0x2,%esi
  jne    L320
  cmp    $0x20,%cl
  je     L49
  cmp    $0x20,%al
  je     L267
  cmp    $0x20,%dl
  mov    $0xffffffff,%esi
  mov    $0x6,%eax
  cmove  %eax,%esi
L49:
  mov    %esi,%eax
  pop    %rbx
  ret
L383:
  mov    %r10d,%esi
  jmp    L49
L354:
  mov    %r11d,%esi
  jmp    L49
L63:
  mov    $0x4,%esi
  jmp    L49
L122:
  mov    $0x8,%esi
  jmp    L49
L320:
  mov    $0xffffffff,%esi
  jmp    L49
L267:
  mov    $0x4,%esi
  jmp    L49
L33:
  mov    $0xffffffff,%esi
  jmp    L49
```

assistant: ```c
int findBlock(char *playground) {
  int count = 0;
  int p;
  for (p = 0; p < 3; p++) {
    if (playground[p * 3 + 0] == 'x')
      count += 1;
    if (playground[p * 3 + 1] == 'x')
      count += 1;
    if (playground[p * 3 + 2] == 'x')
      count += 1;
    if (count == 2) {
      if (playground[p * 3 + 0] == ' ')
        return p * 3 + 0;
      if (playground[p * 3 + 1] == ' ')
        return p * 3 + 1;
      if (playground[p * 3 + 2] == ' ')
        return p * 3 + 2;
    }
    count = 0;
  }
  for (p = 0; p < 3; p++) {
    if (playground[3 * 0 + p] == 'x')
      count += 1;
    if (playground[3 * 1 + p] == 'x')
      count += 1;
    if (playground[3 * 2 + p] == 'x')
      count += 1;
    if (count == 2) {
      if (playground[3 * 0 + p] == ' ')
        return 3 * 0 + p;
      if (playground[3 * 1 + p] == ' ')
        return 3 * 1 + p;
      if (playground[3 * 2 + p] == ' ')
        return 3 * 2 + p;
    }
    count = 0;
  }
  if (playground[3 * 0 + 0] == 'x')
    count += 1;
  if (playground[3 * 1 + 1] == 'x')
    count += 1;
  if (playground[3 * 2 + 2] == 'x')
    count += 1;
  if (count == 2) {
    if (playground[3 * 0 + 0] == ' ')
      return 3 * 0 + 0;
    if (playground[3 * 1 + 1] == ' ')
      return 3 * 1 + 1;
    if (playground[3 * 2 + 2] == ' ')
      return 3 * 2 + 2;
  }
  count = 0;
  if (playground[3 * 0 + 2] == 'x')
    count += 1;
  if (playground[3 * 1 + 1] == 'x')
    count += 1;
  if (playground[3 * 2 + 0] == 'x')
    count += 1;
  if (count == 2) {
    if (playground[3 * 0 + 2] == ' ')
      return 3 * 0 + 2;
    if (playground[3 * 1 + 1] == ' ')
      return 3 * 1 + 1;
    if (playground[3 * 2 + 0] == ' ')
      return 3 * 2 + 0;
  }
  return -1;
}
```