mpy8s.s

ICCAVR中所有的库函数源码

;	fast 8x8=8 multiply

	.text
mpy8s::
	st -Y,r0
	clr r0
loop:
	tst r16
	breq done
	lsr r16
	brsh skip
	add r0,r17
skip:
	lsl r17
	rjmp loop
done:
	mov r16,r0
	ld r0,Y+
	ret