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;; 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))
)
)
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