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jlechner |
/* Definitions for simple data type for positive real numbers.
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Copyright (C) 2002, 2003 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 2, 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 COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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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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#if (HOST_BITS_PER_WIDE_INT / 2) % 2 == 1
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#define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2 - 1)
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#else
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#define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2)
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#endif
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#define uhwi unsigned HOST_WIDE_INT
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#define MAX_HOST_WIDE_INT (((uhwi) 1 << (HOST_BITS_PER_WIDE_INT - 1)) - 1)
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#define SREAL_MIN_SIG ((uhwi) 1 << (SREAL_PART_BITS - 1))
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#define SREAL_MAX_SIG (((uhwi) 1 << SREAL_PART_BITS) - 1)
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#define SREAL_MAX_EXP (INT_MAX / 4)
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#if SREAL_PART_BITS < 32
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#define SREAL_BITS (SREAL_PART_BITS * 2)
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#else
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#define SREAL_BITS SREAL_PART_BITS
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#endif
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/* Structure for holding a simple real number. */
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typedef struct sreal
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{
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#if SREAL_PART_BITS < 32
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unsigned HOST_WIDE_INT sig_lo; /* Significant (lower part). */
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unsigned HOST_WIDE_INT sig_hi; /* Significant (higher part). */
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#else
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unsigned HOST_WIDE_INT sig; /* Significant. */
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#endif
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signed int exp; /* Exponent. */
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} sreal;
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extern void dump_sreal (FILE *, sreal *);
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extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int);
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extern HOST_WIDE_INT sreal_to_int (sreal *);
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extern int sreal_compare (sreal *, sreal *);
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extern sreal *sreal_add (sreal *, sreal *, sreal *);
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extern sreal *sreal_sub (sreal *, sreal *, sreal *);
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extern sreal *sreal_mul (sreal *, sreal *, sreal *);
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extern sreal *sreal_div (sreal *, sreal *, sreal *);
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#endif
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