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arithmetic: Add Ctz function #7

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arithmetic: Add Ctz function #7

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11 changes: 10 additions & 1 deletion ml-proto/src/arithmetic.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@ sig
type t
val of_value : int -> value -> t
val to_value : t -> value
val zero : t
val one : t
val size : int
val neg : t -> t
val abs : t -> t
Expand Down Expand Up @@ -50,7 +52,14 @@ struct
| Abs -> Int.abs
| Not -> Int.lognot
| Clz -> fun i -> i (* TODO *)
| Ctz -> fun i -> i (* TODO *)
| Ctz -> fun i ->
let open Int in
if i = zero then zero else
let rec loop j =
if logand i j = zero
then add one (loop (shift_left j 1))
else zero
in loop one
in fun v -> Int.to_value (f (Int.of_value 1 v))

let binop op =
Expand Down