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1 /* Fixed-point arithmetic support.
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2 Copyright (C) 2006, 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_FIXED_VALUE_H
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21 #define GCC_FIXED_VALUE_H
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22
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23 #include "machmode.h"
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24 #include "real.h"
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25 #include "double-int.h"
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26
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27 struct fixed_value GTY(())
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28 {
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29 double_int data; /* Store data up to 2 wide integers. */
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30 unsigned int mode; /* Use machine mode to know IBIT and FBIT. */
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31 };
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32
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33 #define FIXED_VALUE_TYPE struct fixed_value
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34
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35 #define MAX_FCONST0 18 /* For storing 18 fixed-point zeros per
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36 fract, ufract, accum, and uaccum modes . */
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37 #define MAX_FCONST1 8 /* For storing 8 fixed-point ones per accum
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38 and uaccum modes. */
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39 /* Constant fixed-point values 0 and 1. */
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40 extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0];
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41 extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1];
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42
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43 /* Macros to access fconst0 and fconst1 via machine modes. */
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44 #define FCONST0(mode) fconst0[mode - QQmode]
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45 #define FCONST1(mode) fconst1[mode - HAmode]
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46
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47 /* Return a CONST_FIXED with value R and mode M. */
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48 #define CONST_FIXED_FROM_FIXED_VALUE(r, m) \
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49 const_fixed_from_fixed_value (r, m)
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50 extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, enum machine_mode);
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51
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52 /* Initialize from a decimal or hexadecimal string. */
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53 extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *,
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54 enum machine_mode);
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55
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56 /* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node. */
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57 extern tree build_fixed (tree, FIXED_VALUE_TYPE);
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58
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59 /* Extend or truncate to a new mode. */
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60 extern bool fixed_convert (FIXED_VALUE_TYPE *, enum machine_mode,
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61 const FIXED_VALUE_TYPE *, bool);
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62
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63 /* Convert to a fixed-point mode from an integer. */
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64 extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, enum machine_mode,
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65 double_int, bool, bool);
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66
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67 /* Convert to a fixed-point mode from a real. */
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68 extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, enum machine_mode,
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69 const REAL_VALUE_TYPE *, bool);
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70
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71 /* Convert to a real mode from a fixed-point. */
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72 extern void real_convert_from_fixed (REAL_VALUE_TYPE *, enum machine_mode,
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73 const FIXED_VALUE_TYPE *);
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74
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75 /* Compare two fixed-point objects for bitwise identity. */
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76 extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *);
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77
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78 /* Calculate a hash value. */
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79 extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *);
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80
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81 #define FIXED_VALUES_IDENTICAL(x, y) fixed_identical (&(x), &(y))
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82
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83 /* Determine whether a fixed-point value X is negative. */
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84 #define FIXED_VALUE_NEGATIVE(x) fixed_isneg (&(x))
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85
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86 /* Render F as a decimal floating point constant. */
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87 extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t);
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88
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89 /* Binary or unary arithmetic on tree_code. */
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90 extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *,
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91 const FIXED_VALUE_TYPE *, bool);
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92
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93 /* Compare fixed-point values by tree_code. */
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94 extern bool fixed_compare (int, const FIXED_VALUE_TYPE *,
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95 const FIXED_VALUE_TYPE *);
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96
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97 /* Determine whether a fixed-point value X is negative. */
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98 extern bool fixed_isneg (const FIXED_VALUE_TYPE *);
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99
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100 #endif /* GCC_FIXED_VALUE_H */
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