user: 请将以下的汇编代码转换成C语言代码：

```asm
<CPU_old>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x10,-0x44(%rbp)
  movl   $0x0,-0x40(%rbp)
  movl   $0x12,-0x3c(%rbp)
  movl   $0x14,-0x38(%rbp)
  movl   $0xf00000,-0x34(%rbp)
  movl   $0x30000,-0x30(%rbp)
  movl   $0x40000,-0x2c(%rbp)
  movl   $0xffff,-0x28(%rbp)
  movl   $0x0,-0x5c(%rbp)
  movl   $0x0,-0x48(%rbp)
  jmp    L104
L138:
  mov    -0x5c(%rbp),%edx
  mov    -0x48(%rbp),%eax
  mov    %eax,%esi
  lea    D16(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x5c(%rbp),%edx
  mov    -0x5c(%rbp),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <show_ram@plt>
  mov    -0x5c(%rbp),%eax
  mov    %eax,-0x24(%rbp)
  lea    -0x5c(%rbp),%rax
  mov    %rax,%rdi
  call   <increment_PC@plt>
  mov    -0x24(%rbp),%eax
  mov    %eax,%edi
  call   <fetch_instruction@plt>
  mov    %eax,-0x20(%rbp)
  mov    -0x38(%rbp),%edx
  mov    -0x34(%rbp),%ecx
  mov    -0x20(%rbp),%eax
  mov    %ecx,%esi
  mov    %eax,%edi
  call   <decode@plt>
  mov    %eax,-0x1c(%rbp)
  mov    -0x44(%rbp),%edx
  mov    -0x30(%rbp),%ecx
  mov    -0x20(%rbp),%eax
  mov    %ecx,%esi
  mov    %eax,%edi
  call   <decode@plt>
  mov    %eax,-0x18(%rbp)
  mov    -0x40(%rbp),%edx
  mov    -0x28(%rbp),%ecx
  mov    -0x20(%rbp),%eax
  mov    %ecx,%esi
  mov    %eax,%edi
  call   <decode@plt>
  mov    %eax,-0x14(%rbp)
  mov    -0x3c(%rbp),%edx
  mov    -0x2c(%rbp),%ecx
  mov    -0x20(%rbp),%eax
  mov    %ecx,%esi
  mov    %eax,%edi
  call   <decode@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x1,-0x1c(%rbp)
  jne    L22
  mov    -0x14(%rbp),%eax
  mov    %eax,%edi
  call   <read_ram@plt>
  mov    %eax,-0x4c(%rbp)
  jmp    L104
L22:
  cmpl   $0x2,-0x1c(%rbp)
  jne    L7
  mov    -0x14(%rbp),%eax
  mov    %eax,-0x4c(%rbp)
  jmp    L104
L7:
  cmpl   $0x3,-0x1c(%rbp)
  jne    L166
  mov    -0x14(%rbp),%edx
  mov    -0x4c(%rbp),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <write_ram@plt>
  jmp    L104
L166:
  cmpl   $0x4,-0x1c(%rbp)
  jne    L38
  addl   $0x1,-0x4c(%rbp)
  jmp    L104
L38:
  cmpl   $0xc,-0x1c(%rbp)
  jne    L140
  mov    -0x4c(%rbp),%eax
  mov    %eax,%esi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L104
L140:
  cmpl   $0xd,-0x1c(%rbp)
  jne    L123
  mov    -0x14(%rbp),%eax
  mov    %eax,-0x5c(%rbp)
  jmp    L104
L123:
  cmpl   $0xe,-0x1c(%rbp)
  jne    L91
  jmp    L104
L91:
  cmpl   $0xf,-0x1c(%rbp)
  jne    L82
  mov    -0x5c(%rbp),%eax
  mov    %eax,%esi
  lea    D28(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L125
L82:
  mov    -0x14(%rbp),%eax
  mov    %eax,%edi
  call   <read_ram@plt>
  mov    %eax,-0xc(%rbp)
  lea    D5(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x4c(%rbp),%eax
  mov    %eax,%edi
  call   <hex32@plt>
  lea    D10(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0xc(%rbp),%eax
  mov    %eax,%edi
  call   <hex32@plt>
  lea    -0x50(%rbp),%r9
  lea    -0x58(%rbp),%r8
  mov    -0x10(%rbp),%ecx
  mov    -0x18(%rbp),%edx
  mov    -0xc(%rbp),%esi
  mov    -0x4c(%rbp),%eax
  sub    $0x8,%rsp
  lea    -0x54(%rbp),%rdi
  push   %rdi
  mov    %eax,%edi
  call   <ALU@plt>
  add    $0x10,%rsp
  mov    %eax,-0x4c(%rbp)
  addl   $0x1,-0x48(%rbp)
L104:
  mov    -0x48(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x48(%rbp)
  cmp    $0x63,%eax
  jle    L138
L125:
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L72
  call   <__stack_chk_fail@plt>
L72:
  leave
  ret
```

tool_calls: name: read_data
arguments: tag: D16
type: string
name: read_data
arguments: tag: D18
type: string
name: read_data
arguments: tag: D28
type: string
name: read_data
arguments: tag: D5
type: string
name: read_data
arguments: tag: D10
type: string

tool: D16: Clock Cycle: %d	PC: %d


tool: D18: Syscall output: %d


tool: D28: Program Halted execution at PC: %d


tool: D5: A_reg: 

tool: D10: B_reg: 

assistant: ```c
void CPU_old() {
  int instruction;
  int PC;
  int MAR;
  int DRR;
  int A;
  int opcodes, address, Binvert, cpu_codes;
  int carryOut;
  int overflow;
  int zr;
  int op_shift = 16, address_shift = 0, Binvert_shift = 18, CPUcodes_shift = 20;
  int mask_CPUcodes = 0x00f00000;
  int mask_opcodes = 0x00030000;
  int mask_Binvert = 0x00040000;
  int mask_address = 0x0000ffff;
  PC = 0;
  int clock_counter = 0;
  while ((clock_counter++) < 100) {
    printf("Clock Cycle: %d\tPC: %d\n", clock_counter, PC);
    show_ram(PC, PC);
    MAR = PC;
    increment_PC(&PC);
    instruction = fetch_instruction(MAR);
    cpu_codes = decode(instruction, mask_CPUcodes, CPUcodes_shift);
    opcodes = decode(instruction, mask_opcodes, op_shift);
    address = decode(instruction, mask_address, address_shift);
    Binvert = decode(instruction, mask_Binvert, Binvert_shift);
    if (cpu_codes == 1) {
      A = read_ram(address);
      continue;
    } else if (cpu_codes == 2) {
      A = address;
      continue;
    } else if (cpu_codes == 3) {
      write_ram(A, address);
      continue;
    } else if (cpu_codes == 4) {
      A += 1;
      continue;
    } else if (cpu_codes == 12) {
      printf("Syscall output: %d\n", A);
      continue;
    } else if (cpu_codes == 13) {
      PC = address;
      continue;
    } else if (cpu_codes == 14) {
      continue;
    } else if (cpu_codes == 15) {
      printf("Program Halted execution at PC: %d\n", PC);
      return;
    }
    DRR = read_ram(address);
    printf("A_reg: ");
    hex32(A);
    printf("B_reg: ");
    hex32(DRR);
    A = ALU(A, DRR, opcodes, Binvert, &carryOut, &zr, &overflow);
    clock_counter++;
  }
}
```