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

```asm
<flip_B3>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    -0x28(%rbp),%rax
  shr    $0x7,%rax
  and    -0x30(%rbp),%rax
  movabs $0x20000000000000,%rdx
  and    %rdx,%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rax
  shr    $0x8,%rax
  and    -0x30(%rbp),%rax
  movabs $0x40000000000000,%rdx
  and    %rdx,%rax
  or     %rax,-0x20(%rbp)
  movabs $0x1f0000000000,%rax
  and    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  lea    (%rax,%rax,1),%rdx
  mov    -0x30(%rbp),%rax
  add    %rax,%rdx
  movabs $0x400000000000,%rax
  and    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L14
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <last_bit@plt>
  mov    $0x2,%edx
  mov    %eax,%ecx
  shl    %cl,%rdx
  movabs $0x400000000000,%rax
  sub    %rdx,%rax
  or     %rax,-0x20(%rbp)
L14:
  mov    -0x28(%rbp),%rax
  and    $0x10080402,%eax
  mov    %rax,-0x18(%rbp)
  movabs $0x2010080400,%rax
  and    -0x30(%rbp),%rax
  movabs $0x3fdfeff7f800,%rdx
  or     %rdx,%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  shl    $0x9,%rax
  mov    %rax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rax,%rdx
  movabs $0x400000000000,%rax
  and    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L0
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <last_bit@plt>
  mov    $0x2,%edx
  mov    %eax,%ecx
  shl    %cl,%rdx
  mov    %rdx,%rcx
  movabs $0x400000000000,%rax
  sub    %rcx,%rax
  mov    %rax,%rdx
  movabs $0x2010080400,%rax
  and    %rdx,%rax
  or     %rax,-0x20(%rbp)
L0:
  mov    -0x28(%rbp),%rax
  and    $0x40404040,%eax
  mov    %rax,-0x18(%rbp)
  movabs $0x4040404000,%rax
  and    -0x30(%rbp),%rax
  movabs $0x3fbfbfbf8000,%rdx
  or     %rdx,%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  shl    $0x8,%rax
  mov    %rax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rax,%rdx
  movabs $0x400000000000,%rax
  and    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L8
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <last_bit@plt>
  mov    $0x2,%edx
  mov    %eax,%ecx
  shl    %cl,%rdx
  mov    %rdx,%rcx
  movabs $0x400000000000,%rax
  sub    %rcx,%rax
  mov    %rax,%rdx
  movabs $0x4040404000,%rax
  and    %rdx,%rax
  or     %rax,-0x20(%rbp)
L8:
  mov    -0x20(%rbp),%rax
  leave
  ret
```

assistant: ```c
unsigned long long flip_B3(const unsigned long long discs_player, const unsigned long long discs_opponent) {
  unsigned long long my_discs, opp_discs, r;
  unsigned long long flipped = (discs_opponent & 0X0020000000000000ULL) & (discs_player >> 7);
  flipped |= (discs_opponent & 0X0040000000000000ULL) & (discs_player >> 8);
  my_discs = discs_player & 0X00001F0000000000ULL;
  r = ((my_discs << 1) + discs_opponent) & 0X0000400000000000ULL;
  if (r != 0) {
    flipped |= 0X0000400000000000ULL - (0X2ULL << last_bit(my_discs));
  }
  my_discs = discs_player & 0X0000000010080402ULL;
  opp_discs = (discs_opponent & 0X0000002010080400ULL) | 0X00003FDFEFF7F800ULL;
  r = ((my_discs << 9) + opp_discs) & 0X0000400000000000ULL;
  if (r != 0) {
    flipped |= (0X0000400000000000ULL - (0X2ULL << last_bit(my_discs))) & 0X0000002010080400ULL;
  }
  my_discs = discs_player & 0X0000000040404040ULL;
  opp_discs = (discs_opponent & 0X0000004040404000ULL) | 0X00003FBFBFBF8000ULL;
  r = ((my_discs << 8) + opp_discs) & 0X0000400000000000ULL;
  if (r != 0) {
    flipped |= (0X0000400000000000ULL - (0X2ULL << last_bit(my_discs))) & 0X0000004040404000ULL;
  }
  return flipped;
}
```