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

```asm
<f_nonrecursive>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xd0,%rsp
  mov    %edi,-0xc4(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0xb4(%rbp)
  mov    -0xc4(%rbp),%eax
  mov    %eax,-0xb0(%rbp)
  movl   $0x0,-0x60(%rbp)
  jmp    L153
L63:
  mov    -0xb4(%rbp),%eax
  cltq
  mov    -0x60(%rbp,%rax,4),%eax
  cmp    $0x2,%eax
  je     L159
  cmp    $0x2,%eax
  jg     L153
  test   %eax,%eax
  je     L146
  cmp    $0x1,%eax
  je     L152
  jmp    L153
L146:
  mov    -0xb4(%rbp),%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  cmp    $0x1,%eax
  jle    L35
  mov    -0xb4(%rbp),%eax
  cltq
  movl   $0x1,-0x60(%rbp,%rax,4)
  addl   $0x1,-0xb4(%rbp)
  mov    -0xb4(%rbp),%eax
  sub    $0x1,%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,%edx
  mov    -0xb4(%rbp),%eax
  cltq
  mov    %edx,-0xb0(%rbp,%rax,4)
  mov    -0xb4(%rbp),%eax
  cltq
  movl   $0x0,-0x60(%rbp,%rax,4)
  jmp    L153
L35:
  mov    -0xb4(%rbp),%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  lea    0x1(%rax),%edx
  mov    -0xb4(%rbp),%eax
  cltq
  mov    %edx,-0xb0(%rbp,%rax,4)
  mov    -0xb4(%rbp),%eax
  cltq
  movl   $0x2,-0x60(%rbp,%rax,4)
  jmp    L153
L152:
  mov    -0xb4(%rbp),%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  cmp    $0x1,%eax
  jle    L31
  mov    -0xb4(%rbp),%eax
  cltq
  movl   $0x2,-0x60(%rbp,%rax,4)
  addl   $0x2,-0xb4(%rbp)
  mov    -0xb4(%rbp),%eax
  sub    $0x2,%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  lea    0x3(%rax),%edx
  test   %eax,%eax
  cmovs  %edx,%eax
  sar    $0x2,%eax
  mov    %eax,%edx
  mov    -0xb4(%rbp),%eax
  cltq
  mov    %edx,-0xb0(%rbp,%rax,4)
  mov    -0xb4(%rbp),%eax
  cltq
  movl   $0x1,-0x60(%rbp,%rax,4)
  jmp    L153
L31:
  mov    -0xb4(%rbp),%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  lea    0x1(%rax),%edx
  mov    -0xb4(%rbp),%eax
  cltq
  mov    %edx,-0xb0(%rbp,%rax,4)
  mov    -0xb4(%rbp),%eax
  cltq
  movl   $0x2,-0x60(%rbp,%rax,4)
  jmp    L153
L159:
  mov    -0xb4(%rbp),%eax
  sub    $0x1,%eax
  cltq
  mov    -0x60(%rbp,%rax,4),%eax
  cmp    $0x2,%eax
  jne    L120
  mov    -0xb4(%rbp),%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%edx
  mov    -0xb4(%rbp),%eax
  sub    $0x1,%eax
  cltq
  mov    -0xb0(%rbp,%rax,4),%eax
  mov    -0xb4(%rbp),%ecx
  sub    $0x2,%ecx
  imul   %eax,%edx
  movslq %ecx,%rax
  mov    %edx,-0xb0(%rbp,%rax,4)
  mov    -0xb4(%rbp),%eax
  sub    $0x2,%eax
  cltq
  movl   $0x2,-0x60(%rbp,%rax,4)
  subl   $0x2,-0xb4(%rbp)
  jmp    L141
L120:
  subl   $0x1,-0xb4(%rbp)
L141:
  nop
L153:
  cmpl   $0x0,-0xb4(%rbp)
  jns    L63
  mov    -0xb0(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L136
  call   <__stack_chk_fail@plt>
L136:
  leave
  ret
```

assistant: ```c
int f_nonrecursive(int n) {
  int stack[20], flag[20], cp;
  cp = 0;
  stack[0] = n;
  flag[0] = 0;
  while (cp >= 0) {
    switch (flag[cp]) {
    case 0:
      if (stack[cp] >= 2) {
        flag[cp] = 1;
        cp++;
        stack[cp] = (int)(stack[cp - 1] / 2);
        flag[cp] = 0;
      } else {
        stack[cp] += 1;
        flag[cp] = 2;
      }
      break;
    case 1:
      if (stack[cp] >= 2) {
        flag[cp] = 2;
        cp += 2;
        stack[cp] = (int)(stack[cp - 2] / 4);
        flag[cp] = 1;
      } else {
        stack[cp] += 1;
        flag[cp] = 2;
      }
      break;
    case 2:
      if (flag[cp - 1] == 2) {
        stack[cp - 2] = stack[cp] * stack[cp - 1];
        flag[cp - 2] = 2;
        cp = cp - 2;
      } else
        cp--;
      break;
    }
  }
  return stack[0];
}
```