Module Targetint

Target processor-native integers.

This module provides operations on the type of signed 32-bit integers (on 32-bit target platforms) or signed 64-bit integers (on 64-bit target platforms). This integer type has exactly the same width as that of a pointer type in the C compiler. All arithmetic operations over are taken modulo 232 or 264 depending on the word size of the target architecture.

Warning: this module is unstable and part of compiler-libs.

type t

The type of target integers.

val zero : t

The target integer 0.

val one : t

The target integer 1.

val minus_one : t

The target integer -1.

val neg : t -> t

Unary negation.

val add : t -> t -> t

Addition.

val sub : t -> t -> t

Subtraction.

val mul : t -> t -> t

Multiplication.

val div : t -> t -> t

Integer division. Raise Division_by_zero if the second argument is zero. This division rounds the real quotient of its arguments towards zero, as specified for Stdlib.(/).

val unsigned_div : t -> t -> t

Same as div, except that arguments and result are interpreted as unsigned integers.

val rem : t -> t -> t

Integer remainder. If y is not zero, the result of Targetint.rem x y satisfies the following properties: Targetint.zero <= Nativeint.rem x y < Targetint.abs y and x = Targetint.add (Targetint.mul (Targetint.div x y) y) (Targetint.rem x y). If y = 0, Targetint.rem x y raises Division_by_zero.

val unsigned_rem : t -> t -> t

Same as rem, except that arguments and result are interpreted as unsigned integers.

val succ : t -> t

Successor. Targetint.succ x is Targetint.add x Targetint.one.

val pred : t -> t

Predecessor. Targetint.pred x is Targetint.sub x Targetint.one.

val abs : t -> t

abs x is the absolute value of x. On min_int this is min_int itself and thus remains negative.

val size : int

The size in bits of a target native integer.

val max_int : t

The greatest representable target integer, either 231 - 1 on a 32-bit platform, or 263 - 1 on a 64-bit platform.

val min_int : t

The smallest representable target integer, either -231 on a 32-bit platform, or -263 on a 64-bit platform.

val logand : t -> t -> t

Bitwise logical and.

val logor : t -> t -> t

Bitwise logical or.

val logxor : t -> t -> t

Bitwise logical exclusive or.

val lognot : t -> t

Bitwise logical negation.

val shift_left : t -> int -> t

Targetint.shift_left x y shifts x to the left by y bits. The result is unspecified if y < 0 or y >= bitsize, where bitsize is 32 on a 32-bit platform and 64 on a 64-bit platform.

val shift_right : t -> int -> t

Targetint.shift_right x y shifts x to the right by y bits. This is an arithmetic shift: the sign bit of x is replicated and inserted in the vacated bits. The result is unspecified if y < 0 or y >= bitsize.

val shift_right_logical : t -> int -> t

Targetint.shift_right_logical x y shifts x to the right by y bits. This is a logical shift: zeroes are inserted in the vacated bits regardless of the sign of x. The result is unspecified if y < 0 or y >= bitsize.

val of_int : int -> t

Convert the given integer (type int) to a target integer (type t), module the target word size.

val of_int_exn : int -> t

Convert the given integer (type int) to a target integer (type t). Raises a fatal error if the conversion is not exact.

val to_int : t -> int

Convert the given target integer (type t) to an integer (type int). The high-order bit is lost during the conversion.

val of_float : float -> t

Convert the given floating-point number to a target integer, discarding the fractional part (truncate towards 0). The result of the conversion is undefined if, after truncation, the number is outside the range [Targetint.min_int, Targetint.max_int].

val to_float : t -> float

Convert the given target integer to a floating-point number.

val of_int32 : int32 -> t

Convert the given 32-bit integer (type int32) to a target integer.

val to_int32 : t -> int32

Convert the given target integer to a 32-bit integer (type int32). On 64-bit platforms, the 64-bit native integer is taken modulo 232, i.e. the top 32 bits are lost. On 32-bit platforms, the conversion is exact.

val of_int64 : int64 -> t

Convert the given 64-bit integer (type int64) to a target integer.

val to_int64 : t -> int64

Convert the given target integer to a 64-bit integer (type int64).

val of_string : string -> t

Convert the given string to a target integer. The string is read in decimal (by default) or in hexadecimal, octal or binary if the string begins with 0x, 0o or 0b respectively. Raise Failure "int_of_string" if the given string is not a valid representation of an integer, or if the integer represented exceeds the range of integers representable in type nativeint.

val to_string : t -> string

Return the string representation of its argument, in decimal.

val compare : t -> t -> int

The comparison function for target integers, with the same specification as Stdlib.compare. Along with the type t, this function compare allows the module Targetint to be passed as argument to the functors Set.Make and Map.Make.

val unsigned_compare : t -> t -> int

Same as compare, except that arguments are interpreted as unsigned integers.

val equal : t -> t -> bool

The equal function for target ints.

type repr =
  1. | Int32 of int32
  2. | Int64 of int64
val repr : t -> repr

The concrete representation of a native integer.

val print : Format.formatter -> t -> unit

Print a target integer to a formatter.