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comparison gcc/fixed-value.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Fixed-point arithmetic support.
2 Copyright (C) 2006, 2007 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #ifndef GCC_FIXED_VALUE_H
21 #define GCC_FIXED_VALUE_H
22
23 #include "machmode.h"
24 #include "real.h"
25 #include "double-int.h"
26
27 struct fixed_value GTY(())
28 {
29 double_int data; /* Store data up to 2 wide integers. */
30 unsigned int mode; /* Use machine mode to know IBIT and FBIT. */
31 };
32
33 #define FIXED_VALUE_TYPE struct fixed_value
34
35 #define MAX_FCONST0 18 /* For storing 18 fixed-point zeros per
36 fract, ufract, accum, and uaccum modes . */
37 #define MAX_FCONST1 8 /* For storing 8 fixed-point ones per accum
38 and uaccum modes. */
39 /* Constant fixed-point values 0 and 1. */
40 extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0];
41 extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1];
42
43 /* Macros to access fconst0 and fconst1 via machine modes. */
44 #define FCONST0(mode) fconst0[mode - QQmode]
45 #define FCONST1(mode) fconst1[mode - HAmode]
46
47 /* Return a CONST_FIXED with value R and mode M. */
48 #define CONST_FIXED_FROM_FIXED_VALUE(r, m) \
49 const_fixed_from_fixed_value (r, m)
50 extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, enum machine_mode);
51
52 /* Initialize from a decimal or hexadecimal string. */
53 extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *,
54 enum machine_mode);
55
56 /* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node. */
57 extern tree build_fixed (tree, FIXED_VALUE_TYPE);
58
59 /* Extend or truncate to a new mode. */
60 extern bool fixed_convert (FIXED_VALUE_TYPE *, enum machine_mode,
61 const FIXED_VALUE_TYPE *, bool);
62
63 /* Convert to a fixed-point mode from an integer. */
64 extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, enum machine_mode,
65 double_int, bool, bool);
66
67 /* Convert to a fixed-point mode from a real. */
68 extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, enum machine_mode,
69 const REAL_VALUE_TYPE *, bool);
70
71 /* Convert to a real mode from a fixed-point. */
72 extern void real_convert_from_fixed (REAL_VALUE_TYPE *, enum machine_mode,
73 const FIXED_VALUE_TYPE *);
74
75 /* Compare two fixed-point objects for bitwise identity. */
76 extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *);
77
78 /* Calculate a hash value. */
79 extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *);
80
81 #define FIXED_VALUES_IDENTICAL(x, y) fixed_identical (&(x), &(y))
82
83 /* Determine whether a fixed-point value X is negative. */
84 #define FIXED_VALUE_NEGATIVE(x) fixed_isneg (&(x))
85
86 /* Render F as a decimal floating point constant. */
87 extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t);
88
89 /* Binary or unary arithmetic on tree_code. */
90 extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *,
91 const FIXED_VALUE_TYPE *, bool);
92
93 /* Compare fixed-point values by tree_code. */
94 extern bool fixed_compare (int, const FIXED_VALUE_TYPE *,
95 const FIXED_VALUE_TYPE *);
96
97 /* Determine whether a fixed-point value X is negative. */
98 extern bool fixed_isneg (const FIXED_VALUE_TYPE *);
99
100 #endif /* GCC_FIXED_VALUE_H */