Module Frama_c_kernel.Floating_point

Floating-point operations.

type c_rounding_mode =
  1. | FE_ToNearest
  2. | FE_Upward
  3. | FE_Downward
  4. | FE_TowardZero

Rounding modes defined in the C99 standard.

val string_of_c_rounding_mode : c_rounding_mode -> string
val set_round_downward : unit -> unit
val set_round_upward : unit -> unit
val set_round_nearest_even : unit -> unit
val set_round_toward_zero : unit -> unit
val get_rounding_mode : unit -> c_rounding_mode
val set_rounding_mode : c_rounding_mode -> unit
val round_to_single_precision_float : float -> float
val max_single_precision_float : float
val most_negative_single_precision_float : float
val min_denormal : float
val neg_min_denormal : float
val min_single_precision_denormal : float
val neg_min_single_precision_denormal : float
val sys_single_precision_of_string : string -> float
type parsed_float = {
  1. f_nearest : float;
  2. f_lower : float;
  3. f_upper : float;
}

If s is parsed as (n, l, u), then n is the nearest approximation of s with the desired precision. Moreover, l and u are the most precise float such that l <= s <= u, again with this precision.

Consistent with logic_real definition in Cil_types.

val parse : string -> Cil_types.fkind * parsed_float

parse s parses s and returns the parsed float and its kind (single, double or long double precision) according to its suffix, if any. Strings with no suffix are parsed as double.

val has_suffix : Cil_types.fkind -> string -> bool

Checks if the (uppercased) string ends with an explicit F|D|L suffix corresponding to the given float kind.

val pretty_normal : use_hex:bool -> Format.formatter -> float -> unit
val pretty : Format.formatter -> float -> unit
type sign =
  1. | Neg
  2. | Pos
exception Float_Non_representable_as_Int64 of sign
val truncate_to_integer : float -> Integer.t

Raises Float_Non_representable_as_Int64 if the float value cannot be represented as an Int64 or as an unsigned Int64.

val bits_of_max_double : Integer.t

binary representation of -DBL_MAX and DBL_MAX as 64 bits signed integers

val bits_of_most_negative_double : Integer.t
val bits_of_max_float : Integer.t

binary representation of -FLT_MAX and FLT_MAX as 32 bits signed integers

val bits_of_most_negative_float : Integer.t
val fround : float -> float

Rounds to nearest integer, away from zero (like round() in C).

val trunc : float -> float

Rounds to integer, toward zero (like trunc() in C).

Single-precision (32-bit) floating-point wrappers

val expf : float -> float
val logf : float -> float
val log10f : float -> float
val powf : float -> float -> float
val sqrtf : float -> float
val fmodf : float -> float -> float
val cosf : float -> float
val sinf : float -> float
val acosf : float -> float
val asinf : float -> float
val atanf : float -> float
val atan2f : float -> float -> float

Auxiliary functions similar to the ones in the C math library

val isnan : float -> bool
val isfinite : float -> bool
val nextafter : float -> float -> float
val nextafterf : float -> float -> float