; fast cstrcmp
;
	.text
_cstrcmp::
	mov r30,r16
	mov r31,r17
	mov r26,r18
	mov r27,r19
; Z points to s1
; X points to s2
loop:
	elpm
	adiw R30,1
	ld	r17,x+
	tst r17
	breq done
	sub	r0,r17
	brne done
	rjmp loop
done:
	mov r16,r0
	clr r17
	sbrc r16,7
	com r17
	ret