;; iterative fib(n) in web assembly text format (wat)
;; this gets compiled to the fib.wasm binary
;; and gets fetched via a data URL in index.js
(module
	(export "fib" (func $fib))
	(func $fib (param $n i32) (result i32)
		(local $last i32)
		(local $sum i32)
		(local $i i32)
		(local $tmp i32)
		(if (i32.lt_s (local.get $n) (i32.const 2))
			(return (local.get $n))
		)
		(local.set $last (i32.const 0))
		(local.set $sum (i32.const 1))
		(local.set $i (i32.const 2))
		(local.set $n (i32.add (local.get $n) (i32.const 1)))
		(loop $loop
			(local.set $tmp (local.get $sum))
			(local.set $sum (i32.add (local.get $sum) (local.get $last)))
			(local.set $last (local.get $tmp))
			(local.set $i (i32.add (local.get $i) (i32.const 1)))
			(br_if $loop (i32.lt_s (local.get $i) (local.get $n)))
		)
		(return (local.get $sum))
	)
)