=> 0x7febd81d96b8 <g_bit_lock+72>:	lock bts %r12d,(%rbx)
   0x7febd81d96bd <g_bit_lock+77>:	jb     0x7febd81d96d0 <g_bit_lock+96>
   0x7febd81d96bf <g_bit_lock+79>:	add    $0x8,%rsp
   0x7febd81d96c3 <g_bit_lock+83>:	pop    %rbx
   0x7febd81d96c4 <g_bit_lock+84>:	pop    %rbp
   0x7febd81d96c5 <g_bit_lock+85>:	pop    %r12
   0x7febd81d96c7 <g_bit_lock+87>:	pop    %r13
   0x7febd81d96c9 <g_bit_lock+89>:	retq   
   0x7febd81d96ca <g_bit_lock+90>:	nopw   0x0(%rax,%rax,1)
   0x7febd81d96d0 <g_bit_lock+96>:	mfence 
   0x7febd81d96d3 <g_bit_lock+99>:	mov    (%rbx),%esi
   0x7febd81d96d5 <g_bit_lock+101>:	test   %ebp,%esi
   0x7febd81d96d7 <g_bit_lock+103>:	je     0x7febd81d96b8 <g_bit_lock+72>
   0x7febd81d96d9 <g_bit_lock+105>:	lock addl $0x1,0x0(%r13)
   0x7febd81d96df <g_bit_lock+111>:	mov    %rbx,%rdi
   0x7febd81d96e2 <g_bit_lock+114>:	callq  0x7febd81d9570