113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
/* Definitions for simple data type for positive real numbers.
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Copyright (C) 2002-2014 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_SREAL_H
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#define GCC_SREAL_H
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/* SREAL_PART_BITS has to be an even number. */
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#define SREAL_PART_BITS 32
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#define SREAL_MIN_SIG ((uint64_t) 1 << (SREAL_PART_BITS - 1))
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#define SREAL_MAX_SIG (((uint64_t) 1 << SREAL_PART_BITS) - 1)
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#define SREAL_MAX_EXP (INT_MAX / 4)
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#define SREAL_BITS SREAL_PART_BITS
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/* Structure for holding a simple real number. */
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class sreal
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{
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public:
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/* Construct an uninitialized sreal. */
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sreal () : m_sig (-1), m_exp (-1) {}
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/* Construct a sreal. */
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sreal (uint64_t sig, int exp) : m_sig (sig), m_exp (exp) { normalize (); }
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void dump (FILE *) const;
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int64_t to_int () const;
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sreal operator+ (const sreal &other) const;
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sreal operator- (const sreal &other) const;
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sreal operator* (const sreal &other) const;
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sreal operator/ (const sreal &other) const;
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bool operator< (const sreal &other) const
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{
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return m_exp < other.m_exp
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|| (m_exp == other.m_exp && m_sig < other.m_sig);
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}
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bool operator== (const sreal &other) const
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{
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return m_exp == other.m_exp && m_sig == other.m_sig;
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}
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private:
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void normalize ();
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void shift_right (int amount);
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uint64_t m_sig; /* Significant. */
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signed int m_exp; /* Exponent. */
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};
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extern void debug (sreal &ref);
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extern void debug (sreal *ptr);
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inline sreal &operator+= (sreal &a, const sreal &b)
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{
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return a = a + b;
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}
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inline sreal &operator-= (sreal &a, const sreal &b)
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{
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return a = a - b;
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}
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inline sreal &operator/= (sreal &a, const sreal &b)
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{
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return a = a / b;
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}
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inline sreal &operator*= (sreal &a, const sreal &b)
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{
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return a = a * b;
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}
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inline bool operator!= (const sreal &a, const sreal &b)
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{
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return !(a == b);
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}
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inline bool operator> (const sreal &a, const sreal &b)
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{
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return !(a == b || a < b);
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}
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inline bool operator<= (const sreal &a, const sreal &b)
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{
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return a < b || a == b;
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}
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inline bool operator>= (const sreal &a, const sreal &b)
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{
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return a == b || a > b;
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}
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#endif
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