(* LowShort.def provides access to limits of the gm2 SHORTREAL.

Copyright (C) 2010-2021 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  *)

DEFINITION MODULE LowShort;

  (* Access to underlying properties of the type SHORTREAL *)

CONST
  radix      = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, radix> )) ;      (* ZType *)
  places     = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, places> )) ;     (* ZType *)
  expoMin    = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, expoMin> )) ;    (* ZType *)
  expoMax    = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, expoMax> )) ;    (* ZType *)
  large      = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, large> )) ;      (* RType *)
  small      = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, small> )) ;      (* RType *)
  IEC559     = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, IEC559> )) ;     (* BOOLEAN *)
  LIA1       = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, LIA1> )) ;       (* BOOLEAN *)
  ISO        = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, ISO> )) ;        (* BOOLEAN *)
  IEEE       = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, IEEE> )) ;       (* BOOLEAN *)
  rounds     = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, rounds> )) ;     (* BOOLEAN *)
  gUnderflow = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, gUnderflow> )) ; (* BOOLEAN *)
  exception  = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, exception> )) ;  (* BOOLEAN *)
  extend     = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, extend> )) ;     (* BOOLEAN *)
  nModes     = __ATTRIBUTE__ __BUILTIN__ (( <SHORTREAL, nModes> )) ;     (* ZType *)

TYPE
  Modes = PACKEDSET OF [0 .. nModes-1];

PROCEDURE exponent (x: SHORTREAL): INTEGER;
  (* Returns the exponent value of x *)

PROCEDURE fraction (x: SHORTREAL): SHORTREAL;
  (* Returns the significand (or significant part) of x *)

PROCEDURE sign (x: SHORTREAL): SHORTREAL;
  (* Returns the signum of x *)

PROCEDURE succ (x: SHORTREAL): SHORTREAL;
  (* Returns the next value of the type SHORTREAL greater than x *)

PROCEDURE ulp (x: SHORTREAL): SHORTREAL;
  (* Returns the value of a unit in the last place of x *)

PROCEDURE pred (x: SHORTREAL): SHORTREAL;
  (* Returns the previous value of the type SHORTREAL less than x *)

PROCEDURE intpart (x: SHORTREAL): SHORTREAL;
  (* Returns the integer part of x *)

PROCEDURE fractpart (x: SHORTREAL): SHORTREAL;
  (* Returns the fractional part of x *)

PROCEDURE scale (x: SHORTREAL; n: INTEGER): SHORTREAL;
  (* Returns the value of x * radix ** n *)

PROCEDURE trunc (x: SHORTREAL; n: INTEGER): SHORTREAL;
  (* Returns the value of the first n places of x *)

PROCEDURE round (x: SHORTREAL; n: INTEGER): SHORTREAL;
  (* Returns the value of x rounded to the first n places *)

PROCEDURE synthesize (expart: INTEGER; frapart: SHORTREAL): SHORTREAL;
  (* Returns a value of the type SHORTREAL constructed from the given expart and frapart *)

PROCEDURE setMode (m: Modes);
  (* Sets status flags appropriate to the underlying implementation of the type SHORTREAL *)

PROCEDURE currentMode (): Modes;
  (* Returns the current status flags in the form set by setMode *)

PROCEDURE IsLowException (): BOOLEAN;
  (* Returns TRUE if the current coroutine is in the exceptional execution state
     because of the raising of an exception in a routine from this module; otherwise
     returns FALSE.
  *)

END LowShort.
