=> 0x7f90bd9e9189:	movzwl (%rsi),%edx
   0x7f90bd9e918c:	movzwl (%rsi,%r8,1),%ecx
   0x7f90bd9e9191:	cmp    %cx,%dx
   0x7f90bd9e9194:	je     0x7f90bd9e91c0
   0x7f90bd9e9196:	mov    %edx,%eax
   0x7f90bd9e9198:	sub    %ecx,%eax
   0x7f90bd9e919a:	retq   
   0x7f90bd9e919b:	nopl   0x0(%rax,%rax,1)
   0x7f90bd9e91a0:	tzcnt  %ecx,%ecx
   0x7f90bd9e91a4:	movslq %ecx,%rcx
   0x7f90bd9e91a7:	movzwl (%rdi,%rcx,1),%edx
   0x7f90bd9e91ab:	add    %r8,%rdi
   0x7f90bd9e91ae:	movzwl (%rdi,%rcx,1),%eax
   0x7f90bd9e91b2:	sub    %eax,%edx
   0x7f90bd9e91b4:	mov    %edx,%eax
   0x7f90bd9e91b6:	repz retq