=> 0x546910:	mov    0x8(%rdi),%rax
   0x546914:	testb  $0x40,0xa9(%rax)
   0x54691b:	jne    0x546920
   0x54691d:	xor    %eax,%eax
   0x54691f:	retq   
   0x546920:	push   %rbx
   0x546921:	mov    0x148(%rax),%rax
   0x546928:	mov    %rdi,%rbx
   0x54692b:	test   %rax,%rax
   0x54692e:	jne    0x546950
   0x546930:	mov    -0x8(%rbx),%rax
   0x546934:	cmp    $0x1,%rax
   0x546938:	jle    0x546942
   0x54693a:	sub    $0x2,%rax
   0x54693e:	mov    %rax,-0x8(%rbx)
   0x546942:	xor    %eax,%eax