.equ STDOUT, 1
.equ SVC_WRITE, 64
.equ SVC_EXIT, 93

.text
.global _start

_start:
	stp x29, x30, [sp, -16]!
	mov x0, #123
	mov x1, #456
	mov x29, sp
	bl integer_compare // integer_compare(123, 456);
	mov x0, #-123
	mov x1, #-456
	bl integer_compare // integer_compare(-123, -456);
	mov x0, #123
	mov x1, #123
	bl integer_compare // integer_compare(123, 123);
	ldp x29, x30, [sp], 16
	mov x0, #0
	b _exit // exit(0);

// void integer_compare(long long x, long long y) - compare two signed integers and print a message
integer_compare:
	cmp x0, x1
	mov x0, #STDOUT
	b.eq 1f
	b.gt 2f
	// x < y
	ldr x1, =msg_lt
	mov x2, #17
	b _write
1:	// x == y
	ldr x1, =msg_eq
	mov x2, #16
	b _write
2:	// x > y
	ldr x1, =msg_gt
	mov x2, #20
	b _write

msg_lt:
	.ascii "x is less than y\n"
msg_eq:
	.ascii "x is equal to y\n"
msg_gt:
	.ascii "x is greater than y\n"
.align 4

//////////////// system call wrappers
// ssize_t _write(int fd, void *buf, size_t count)
_write:
	stp x29, x30, [sp, -16]!
	mov x8, #SVC_WRITE
	mov x29, sp
	svc #0
	ldp x29, x30, [sp], 16
	ret

// void _exit(int retval)
_exit:
	mov x8, #SVC_EXIT
	svc #0