.global _input_stride
_input_stride:
	/* r8: const input start                   */
	/* r1: input start (initialized by caller) */
	/* return r1 : stride */
loop:
	mov.b	@r1+,r0
	cmp/eq	#0xa,r0 	/* ascii space */
	bf	loop
	rts
	sub	r8,r1		/* r1 - r8 → r1 */