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1 /* Definitions for simple data type for positive real numbers.
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2 Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_SREAL_H
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21 #define GCC_SREAL_H
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22
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23 /* SREAL_PART_BITS has to be an even number. */
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24 #if (HOST_BITS_PER_WIDE_INT / 2) % 2 == 1
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25 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2 - 1)
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26 #else
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27 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2)
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28 #endif
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29
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30 #define uhwi unsigned HOST_WIDE_INT
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31 #define MAX_HOST_WIDE_INT (((uhwi) 1 << (HOST_BITS_PER_WIDE_INT - 1)) - 1)
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32
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33 #define SREAL_MIN_SIG ((uhwi) 1 << (SREAL_PART_BITS - 1))
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34 #define SREAL_MAX_SIG (((uhwi) 1 << SREAL_PART_BITS) - 1)
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35 #define SREAL_MAX_EXP (INT_MAX / 4)
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36
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37 #if SREAL_PART_BITS < 32
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38 #define SREAL_BITS (SREAL_PART_BITS * 2)
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39 #else
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40 #define SREAL_BITS SREAL_PART_BITS
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41 #endif
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42
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43 /* Structure for holding a simple real number. */
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44 typedef struct sreal
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45 {
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46 #if SREAL_PART_BITS < 32
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47 unsigned HOST_WIDE_INT sig_lo; /* Significant (lower part). */
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48 unsigned HOST_WIDE_INT sig_hi; /* Significant (higher part). */
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49 #else
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50 unsigned HOST_WIDE_INT sig; /* Significant. */
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51 #endif
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52 signed int exp; /* Exponent. */
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53 } sreal;
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54
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55 extern void dump_sreal (FILE *, sreal *);
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56 extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int);
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57 extern HOST_WIDE_INT sreal_to_int (sreal *);
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58 extern int sreal_compare (sreal *, sreal *);
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59 extern sreal *sreal_add (sreal *, sreal *, sreal *);
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60 extern sreal *sreal_sub (sreal *, sreal *, sreal *);
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61 extern sreal *sreal_mul (sreal *, sreal *, sreal *);
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62 extern sreal *sreal_div (sreal *, sreal *, sreal *);
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63
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64 #endif
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