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(**************************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. *)
(* *)
(* All rights reserved. This file is distributed under the terms of *)
(* the GNU Lesser General Public License version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
(* Module [Int32]: 32-bit integers *)
external neg : int32 -> int32 = "%int32_neg"
external add : int32 -> int32 -> int32 = "%int32_add"
external sub : int32 -> int32 -> int32 = "%int32_sub"
external mul : int32 -> int32 -> int32 = "%int32_mul"
external div : int32 -> int32 -> int32 = "%int32_div"
external rem : int32 -> int32 -> int32 = "%int32_mod"
external logand : int32 -> int32 -> int32 = "%int32_and"
external logor : int32 -> int32 -> int32 = "%int32_or"
external logxor : int32 -> int32 -> int32 = "%int32_xor"
external shift_left : int32 -> int -> int32 = "%int32_lsl"
external shift_right : int32 -> int -> int32 = "%int32_asr"
external shift_right_logical : int32 -> int -> int32 = "%int32_lsr"
external of_int : int -> int32 = "%int32_of_int"
external to_int : int32 -> int = "%int32_to_int"
external of_float : float -> int32
= "caml_int32_of_float" "caml_int32_of_float_unboxed"
[@@unboxed] [@@noalloc]
external to_float : int32 -> float
= "caml_int32_to_float" "caml_int32_to_float_unboxed"
[@@unboxed] [@@noalloc]
external bits_of_float : float -> int32
= "caml_int32_bits_of_float" "caml_int32_bits_of_float_unboxed"
[@@unboxed] [@@noalloc]
external float_of_bits : int32 -> float
= "caml_int32_float_of_bits" "caml_int32_float_of_bits_unboxed"
[@@unboxed] [@@noalloc]
let zero = 0l
let one = 1l
let minus_one = -1l
let succ n = add n 1l
let pred n = sub n 1l
let abs n = if n >= 0l then n else neg n
let min_int = 0x80000000l
let max_int = 0x7FFFFFFFl
let lognot n = logxor n (-1l)
let unsigned_to_int =
match Sys.word_size with
| 32 ->
let max_int = of_int Stdlib.max_int in
fun n ->
if compare zero n <= 0 && compare n max_int <= 0 then
Some (to_int n)
else
None
| 64 ->
(* So that it compiles in 32-bit *)
let mask = 0xFFFF lsl 16 lor 0xFFFF in
fun n -> Some (to_int n land mask)
| _ ->
assert false
external format : string -> int32 -> string = "caml_int32_format"
let to_string n = format "%d" n
external of_string : string -> int32 = "caml_int32_of_string"
let of_string_opt s =
(* TODO: expose a non-raising primitive directly. *)
try Some (of_string s)
with Failure _ -> None
type t = int32
let compare (x: t) (y: t) = Stdlib.compare x y
let equal (x: t) (y: t) = compare x y = 0
let unsigned_compare n m =
compare (sub n min_int) (sub m min_int)
let min x y : t = if x <= y then x else y
let max x y : t = if x >= y then x else y
(* Unsigned division from signed division of the same
bitness. See Warren Jr., Henry S. (2013). Hacker's Delight (2 ed.), Sec 9-3.
*)
let unsigned_div n d =
if d < zero then
if unsigned_compare n d < 0 then zero else one
else
let q = shift_left (div (shift_right_logical n 1) d) 1 in
let r = sub n (mul q d) in
if unsigned_compare r d >= 0 then succ q else q
let unsigned_rem n d =
sub n (mul (unsigned_div n d) d)
external seeded_hash_param :
int -> int -> int -> 'a -> int = "caml_hash" [@@noalloc]
let seeded_hash seed x = seeded_hash_param 10 100 seed x
let hash x = seeded_hash_param 10 100 0 x
|
