=> 0x7ffc3912667c <g_type_check_instance_is_a+60>:	testb  $0x4,0x16(%rdi)
   0x7ffc39126680 <g_type_check_instance_is_a+64>:	je     0x7ffc391266f0 <g_type_check_instance_is_a+176>
   0x7ffc39126682 <g_type_check_instance_is_a+66>:	test   %rsi,%rsi
   0x7ffc39126685 <g_type_check_instance_is_a+69>:	je     0x7ffc391266f0 <g_type_check_instance_is_a+176>
   0x7ffc39126687 <g_type_check_instance_is_a+71>:	movzbl 0x14(%rsi),%eax
   0x7ffc3912668b <g_type_check_instance_is_a+75>:	movzbl 0x14(%rdi),%edx
   0x7ffc3912668f <g_type_check_instance_is_a+79>:	cmp    %dl,%al
   0x7ffc39126691 <g_type_check_instance_is_a+81>:	ja     0x7ffc391266a3 <g_type_check_instance_is_a+99>
   0x7ffc39126693 <g_type_check_instance_is_a+83>:	sub    %eax,%edx
   0x7ffc39126695 <g_type_check_instance_is_a+85>:	mov    0x48(%rsi),%rcx
   0x7ffc39126699 <g_type_check_instance_is_a+89>:	movslq %edx,%rdx
   0x7ffc3912669c <g_type_check_instance_is_a+92>:	cmp    %rcx,0x48(%rdi,%rdx,8)
   0x7ffc391266a1 <g_type_check_instance_is_a+97>:	je     0x7ffc391266e3 <g_type_check_instance_is_a+163>
   0x7ffc391266a3 <g_type_check_instance_is_a+99>:	cltq   
   0x7ffc391266a5 <g_type_check_instance_is_a+101>:	cmpq   $0x8,0x48(%rsi,%rax,8)
   0x7ffc391266ab <g_type_check_instance_is_a+107>:	je     0x7ffc391266d8 <g_type_check_instance_is_a+152>