gdc / d / d-gcc-real.h

// GDC -- D front-end for GCC
// Copyright (C) 2004 David Friedman

// This program 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 2 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


struct real_value;
struct Type;

struct real_t
  // Including gcc/real.h presents too many problems, so
  // just statically allocate enough space for REAL_VALUE_TYPE.
#define REAL_T_SIZE (16 + sizeof(long))/sizeof(long) + 1

  enum Mode {

  struct fake_t {
      int c;
      int s;
      int e;
      long m[REAL_T_SIZE];

  fake_t frv;

  static void init();
  static real_t parse(const char * str, Mode mode);
  static real_t getnan(Mode mode);
  static real_t getsnan(Mode mode);
  static real_t getinfinity();

  // This constructor prevent the use of the real_t in a union
  real_t() { }
  real_t(const real_t & r);

  const real_value & rv() const;
  real_value & rv();
  real_t(const real_value & rv);
  real_t(int v);
  real_t(d_uns64 v);
  real_t(d_int64 v);
  real_t & operator=(const real_t & r);
  real_t & operator=(int v);
  real_t operator+ (const real_t & r);
  real_t operator- (const real_t & r);
  real_t operator- ();
  real_t operator* (const real_t & r);
  real_t operator/ (const real_t & r);
  real_t operator% (const real_t & r);
  bool operator< (const real_t & r);
  bool operator> (const real_t & r);
  bool operator<= (const real_t & r);
  bool operator>= (const real_t & r);
  bool operator== (const real_t & r);
  bool operator!= (const real_t & r);
  //operator d_uns64(); // avoid bugs, but maybe allow operator bool()
  d_uns64 toInt() const;
  d_uns64 toInt(Type * real_type, Type * int_type) const;
  real_t convert(Mode to_mode) const;
  real_t convert(Type * to_type) const;
  bool isZero();
  bool isNegative();
  bool isConst0();
  bool isConst1();
  bool isConst2();
  bool isConstMinus1();
  bool isConstHalf();
  bool floatCompare(int op, const real_t & r);
  bool isIdenticalTo(const real_t & r) const;
  void format(char * buf, unsigned buf_size) const;
  void formatHex(char * buf, unsigned buf_size) const;
  // for debugging:
  bool isInf();
  bool isNan();
  bool isSignallingNan();
  bool isConversionExact(Mode to_mode) const;
  void dump();
  // prevent this from being used
  real_t & operator=(float) { return *this; }
  real_t & operator=(double) { return *this; }
  // real_t & operator=(long double v) { return *this; }

struct real_t_Properties
  real_t maxval, minval, epsilonval/*, nanval, infval*/;
  d_int64 dig, mant_dig;
  d_int64 max_10_exp, min_10_exp;
  d_int64 max_exp, min_exp;

extern real_t_Properties real_t_properties[real_t::NumModes];