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

```asm
<flip_A5>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  movq   $0x0,-0x20(%rbp)
  mov    -0x28(%rbp),%rax
  and    $0x3f000000,%eax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  lea    (%rax,%rax,1),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  and    $0x80000000,%eax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L49
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <last_bit@plt>
  mov    $0x2,%edx
  mov    %eax,%ecx
  shl    %cl,%rdx
  mov    $0x80000000,%eax
  sub    %rdx,%rax
  or     %rax,-0x20(%rbp)
L49:
  movabs $0x810200000000000,%rax
  and    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  movabs $0x10204000000000,%rax
  and    -0x30(%rbp),%rax
  movabs $0x7efdf8000000000,%rdx
  or     %rdx,%rax
  mov    %rax,-0x8(%rbp)
  movabs $0x4000000000,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  and    -0x18(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L30
  mov    -0x10(%rbp),%rax
  lea    -0x1(%rax),%rdx
  movabs $0x10204000000000,%rax
  and    %rdx,%rax
  or     %rax,-0x20(%rbp)
L30:
  mov    -0x28(%rbp),%rax
  and    $0x2010,%eax
  mov    %rax,-0x18(%rbp)
  mov    -0x30(%rbp),%rax
  and    $0x402000,%eax
  or     $0x7fbfc000,%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  shl    $0x9,%rax
  mov    %rax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  and    $0x80000000,%eax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L6
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <last_bit@plt>
  mov    $0x2,%edx
  mov    %eax,%ecx
  shl    %cl,%rdx
  mov    $0x80000000,%eax
  sub    %rdx,%rax
  and    $0x402000,%eax
  or     %rax,-0x20(%rbp)
L6:
  movabs $0x8080800000000000,%rax
  and    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  movabs $0x80808000000000,%rax
  and    -0x30(%rbp),%rax
  movabs $0x7f7f7f0000000000,%rdx
  or     %rdx,%rax
  mov    %rax,-0x8(%rbp)
  movabs $0x8000000000,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  and    -0x18(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L46
  mov    -0x10(%rbp),%rax
  lea    -0x1(%rax),%rdx
  movabs $0x80808000000000,%rax
  and    %rdx,%rax
  or     %rax,-0x20(%rbp)
L46:
  mov    -0x28(%rbp),%rax
  and    $0x8080,%eax
  mov    %rax,-0x18(%rbp)
  mov    -0x30(%rbp),%rax
  and    $0x808000,%eax
  or     $0x7f7f0000,%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  shl    $0x8,%rax
  mov    %rax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  and    $0x80000000,%eax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L28
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <last_bit@plt>
  mov    $0x2,%edx
  mov    %eax,%ecx
  shl    %cl,%rdx
  mov    $0x80000000,%eax
  sub    %rdx,%rax
  and    $0x808000,%eax
  or     %rax,-0x20(%rbp)
L28:
  mov    -0x20(%rbp),%rax
  leave
  ret
```

assistant: ```c
unsigned long long flip_A5(const unsigned long long discs_player, const unsigned long long discs_opponent) {
  unsigned long long my_discs, opp_discs, r, flipped = 0ULL;
  my_discs = discs_player & 0X000000003F000000ULL;
  r = ((my_discs << 1) + discs_opponent) & 0X0000000080000000ULL;
  if (r != 0) {
    flipped |= 0X0000000080000000ULL - (0X2ULL << last_bit(my_discs));
  }
  my_discs = discs_player & 0X0810200000000000ULL;
  opp_discs = (discs_opponent & 0X0010204000000000ULL) | 0X07EFDF8000000000ULL;
  r = (opp_discs + 0X0000004000000000ULL) & my_discs;
  if (r != 0) {
    flipped |= (r - 1) & 0X0010204000000000ULL;
  }
  my_discs = discs_player & 0X0000000000002010ULL;
  opp_discs = (discs_opponent & 0X0000000000402000ULL) | 0X000000007FBFC000ULL;
  r = ((my_discs << 9) + opp_discs) & 0X0000000080000000ULL;
  if (r != 0) {
    flipped |= (0X0000000080000000ULL - (0X2ULL << last_bit(my_discs))) & 0X0000000000402000ULL;
  }
  my_discs = discs_player & 0X8080800000000000ULL;
  opp_discs = (discs_opponent & 0X0080808000000000ULL) | 0X7F7F7F0000000000ULL;
  r = (opp_discs + 0X0000008000000000ULL) & my_discs;
  if (r != 0) {
    flipped |= (r - 1) & 0X0080808000000000ULL;
  }
  my_discs = discs_player & 0X0000000000008080ULL;
  opp_discs = (discs_opponent & 0X0000000000808000ULL) | 0X000000007F7F0000ULL;
  r = ((my_discs << 8) + opp_discs) & 0X0000000080000000ULL;
  if (r != 0) {
    flipped |= (0X0000000080000000ULL - (0X2ULL << last_bit(my_discs))) & 0X0000000000808000ULL;
  }
  return flipped;
}
```