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comparison gcc/sreal.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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children 04ced10e8804
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-1:000000000000 0:a06113de4d67
1 /* Definitions for simple data type for positive real numbers.
2 Copyright (C) 2002, 2003, 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_SREAL_H
21 #define GCC_SREAL_H
22
23 /* SREAL_PART_BITS has to be an even number. */
24 #if (HOST_BITS_PER_WIDE_INT / 2) % 2 == 1
25 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2 - 1)
26 #else
27 #define SREAL_PART_BITS (HOST_BITS_PER_WIDE_INT / 2)
28 #endif
29
30 #define uhwi unsigned HOST_WIDE_INT
31 #define MAX_HOST_WIDE_INT (((uhwi) 1 << (HOST_BITS_PER_WIDE_INT - 1)) - 1)
32
33 #define SREAL_MIN_SIG ((uhwi) 1 << (SREAL_PART_BITS - 1))
34 #define SREAL_MAX_SIG (((uhwi) 1 << SREAL_PART_BITS) - 1)
35 #define SREAL_MAX_EXP (INT_MAX / 4)
36
37 #if SREAL_PART_BITS < 32
38 #define SREAL_BITS (SREAL_PART_BITS * 2)
39 #else
40 #define SREAL_BITS SREAL_PART_BITS
41 #endif
42
43 /* Structure for holding a simple real number. */
44 typedef struct sreal
45 {
46 #if SREAL_PART_BITS < 32
47 unsigned HOST_WIDE_INT sig_lo; /* Significant (lower part). */
48 unsigned HOST_WIDE_INT sig_hi; /* Significant (higher part). */
49 #else
50 unsigned HOST_WIDE_INT sig; /* Significant. */
51 #endif
52 signed int exp; /* Exponent. */
53 } sreal;
54
55 extern void dump_sreal (FILE *, sreal *);
56 extern sreal *sreal_init (sreal *, unsigned HOST_WIDE_INT, signed int);
57 extern HOST_WIDE_INT sreal_to_int (sreal *);
58 extern int sreal_compare (sreal *, sreal *);
59 extern sreal *sreal_add (sreal *, sreal *, sreal *);
60 extern sreal *sreal_sub (sreal *, sreal *, sreal *);
61 extern sreal *sreal_mul (sreal *, sreal *, sreal *);
62 extern sreal *sreal_div (sreal *, sreal *, sreal *);
63
64 #endif