(* 'extract' functions are used in bitmatch statements. *)
-val extract_bitstring : string -> int -> int -> int -> bitstring
-
-val extract_remainder : string -> int -> int -> bitstring
-
val extract_bit : string -> int -> int -> int -> bool
val extract_char_unsigned : string -> int -> int -> int -> int
val extract_int64_ee_unsigned : endian -> string -> int -> int -> int -> int64
+external extract_fastpath_int16_be_unsigned : string -> int -> int = "ocaml_bitstring_extract_fastpath_int16_be_unsigned" "noalloc"
+
+external extract_fastpath_int16_le_unsigned : string -> int -> int = "ocaml_bitstring_extract_fastpath_int16_le_unsigned" "noalloc"
+
+external extract_fastpath_int16_ne_unsigned : string -> int -> int = "ocaml_bitstring_extract_fastpath_int16_ne_unsigned" "noalloc"
+
+external extract_fastpath_int16_be_signed : string -> int -> int = "ocaml_bitstring_extract_fastpath_int16_be_signed" "noalloc"
+
+external extract_fastpath_int16_le_signed : string -> int -> int = "ocaml_bitstring_extract_fastpath_int16_le_signed" "noalloc"
+
+external extract_fastpath_int16_ne_signed : string -> int -> int = "ocaml_bitstring_extract_fastpath_int16_ne_signed" "noalloc"
+
+(*
+external extract_fastpath_int24_be_unsigned : string -> int -> int = "ocaml_bitstring_extract_fastpath_int24_be_unsigned" "noalloc"
+
+external extract_fastpath_int24_le_unsigned : string -> int -> int = "ocaml_bitstring_extract_fastpath_int24_le_unsigned" "noalloc"
+
+external extract_fastpath_int24_ne_unsigned : string -> int -> int = "ocaml_bitstring_extract_fastpath_int24_ne_unsigned" "noalloc"
+
+external extract_fastpath_int24_be_signed : string -> int -> int = "ocaml_bitstring_extract_fastpath_int24_be_signed" "noalloc"
+
+external extract_fastpath_int24_le_signed : string -> int -> int = "ocaml_bitstring_extract_fastpath_int24_le_signed" "noalloc"
+
+external extract_fastpath_int24_ne_signed : string -> int -> int = "ocaml_bitstring_extract_fastpath_int24_ne_signed" "noalloc"
+*)
+
+external extract_fastpath_int32_be_unsigned : string -> int -> int32 -> int32 = "ocaml_bitstring_extract_fastpath_int32_be_unsigned" "noalloc"
+
+external extract_fastpath_int32_le_unsigned : string -> int -> int32 -> int32 = "ocaml_bitstring_extract_fastpath_int32_le_unsigned" "noalloc"
+
+external extract_fastpath_int32_ne_unsigned : string -> int -> int32 -> int32 = "ocaml_bitstring_extract_fastpath_int32_ne_unsigned" "noalloc"
+
+external extract_fastpath_int32_be_signed : string -> int -> int32 -> int32 = "ocaml_bitstring_extract_fastpath_int32_be_signed" "noalloc"
+
+external extract_fastpath_int32_le_signed : string -> int -> int32 -> int32 = "ocaml_bitstring_extract_fastpath_int32_le_signed" "noalloc"
+
+external extract_fastpath_int32_ne_signed : string -> int -> int32 -> int32 = "ocaml_bitstring_extract_fastpath_int32_ne_signed" "noalloc"
+
+(*
+external extract_fastpath_int40_be_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int40_be_unsigned" "noalloc"
+
+external extract_fastpath_int40_le_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int40_le_unsigned" "noalloc"
+
+external extract_fastpath_int40_ne_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int40_ne_unsigned" "noalloc"
+
+external extract_fastpath_int40_be_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int40_be_signed" "noalloc"
+
+external extract_fastpath_int40_le_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int40_le_signed" "noalloc"
+
+external extract_fastpath_int40_ne_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int40_ne_signed" "noalloc"
+
+external extract_fastpath_int48_be_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int48_be_unsigned" "noalloc"
+
+external extract_fastpath_int48_le_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int48_le_unsigned" "noalloc"
+
+external extract_fastpath_int48_ne_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int48_ne_unsigned" "noalloc"
+
+external extract_fastpath_int48_be_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int48_be_signed" "noalloc"
+
+external extract_fastpath_int48_le_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int48_le_signed" "noalloc"
+
+external extract_fastpath_int48_ne_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int48_ne_signed" "noalloc"
+
+external extract_fastpath_int56_be_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int56_be_unsigned" "noalloc"
+
+external extract_fastpath_int56_le_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int56_le_unsigned" "noalloc"
+
+external extract_fastpath_int56_ne_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int56_ne_unsigned" "noalloc"
+
+external extract_fastpath_int56_be_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int56_be_signed" "noalloc"
+
+external extract_fastpath_int56_le_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int56_le_signed" "noalloc"
+
+external extract_fastpath_int56_ne_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int56_ne_signed" "noalloc"
+*)
+
+external extract_fastpath_int64_be_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int64_be_unsigned" "noalloc"
+
+external extract_fastpath_int64_le_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int64_le_unsigned" "noalloc"
+
+external extract_fastpath_int64_ne_unsigned : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int64_ne_unsigned" "noalloc"
+
+external extract_fastpath_int64_be_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int64_be_signed" "noalloc"
+
+external extract_fastpath_int64_le_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int64_le_signed" "noalloc"
+
+external extract_fastpath_int64_ne_signed : string -> int -> int64 -> int64 = "ocaml_bitstring_extract_fastpath_int64_ne_signed" "noalloc"
+
(* 'construct' functions are used in BITSTRING constructors. *)
val construct_bit : Buffer.t -> bool -> int -> exn -> unit