	.section	.text
	.global	isdigit
	.type	isdigit, %function
isdigit:
	sub	sp, sp, #8
	str	r0, [sp, #4]
	cmp	r0, #57		@ ch <= 57
	ite	ls
	movls	r0, #1		@ lower or same, true
	movhi	r0, #0		@ higher, false
	add	sp, sp, #8
	mov	pc, lr		@ Return
