# Module Targetint

    module Targetint: sig .. end

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 `Targetint.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 `Targetint.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 `Targetint.compare`, except that arguments are interpreted as unsigned integers.

    val equal : t -> t -> bool

The equal function for target ints.

    type repr =

`|` | `Int32 of `int32``
`|` | `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.