movl	$-1, -1(%rbp)	#constant assign
	movl	-1(%rbp), %eax	#assign start
	movl	%eax, -2(%rbp)	#assign end
	movzbl	-2(%rbp), %eax	#not start
	testl	%eax, %eax
	setne	%al
	xorl	$1, %eax
	movzbl	%al, %eax
	movb	%al, -3(%rbp)
	andb	$1, -3(%rbp)	#not end
	movl	-3(%rbp), %eax	#assign start
	movl	%eax, -4(%rbp)	#assign end
	movl	$1, -8(%rbp)	#constant assign