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Add extract simplifications #291

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11 changes: 10 additions & 1 deletion src/expr.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -458,11 +458,20 @@ let extract' (hte : t) ~(high : int) ~(low : int) : t =
make (Extract (hte, high, low))
[@@inline]

let extract (hte : t) ~(high : int) ~(low : int) : t =
let rec extract (hte : t) ~(high : int) ~(low : int) : t =
match view hte with
| Val (Num (I64 x)) ->
let x' = nland64 (Int64.shift_right x (low * 8)) (high - low) in
value (Num (I64 x'))
| Cvtop (ty, Ty.Cvtop.Zero_extend n, x) when (Ty.size ty * 8) - n >= 8 * high
->
extract x ~high ~low
| Concat (_l, r) when Ty.size (ty r) >= high -> extract r ~high ~low
| Concat (l, r) when Ty.size (ty r) <= low ->
let size_r = Ty.size (ty r) in
let high = high - size_r in
let low = low - size_r in
extract l ~high ~low
| _ -> if high - low = Ty.size (ty hte) then hte else extract' hte ~high ~low

let concat' (msb : t) (lsb : t) : t = make (Concat (msb, lsb)) [@@inline]
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