forked from bonzini/smalltalk
-
Notifications
You must be signed in to change notification settings - Fork 0
/
real.h
105 lines (88 loc) · 3.85 KB
/
real.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
/******************************** -*- C -*- ****************************
*
* Simple floating-point data type
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 2009 Free Software Foundation, Inc.
* Written by Paolo Bonzini.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any later
* version.
*
* Linking GNU Smalltalk statically or dynamically with other modules is
* making a combined work based on GNU Smalltalk. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* In addition, as a special exception, the Free Software Foundation
* give you permission to combine GNU Smalltalk with free software
* programs or libraries that are released under the GNU LGPL and with
* independent programs running under the GNU Smalltalk virtual machine.
*
* You may copy and distribute such a system following the terms of the
* GNU GPL for GNU Smalltalk and the licenses of the other code
* concerned, provided that you include the source code of that other
* code when and as the GNU GPL requires distribution of source code.
*
* Note that people who make modified versions of GNU Smalltalk are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version without
* this exception; this exception also makes it possible to release a
* modified version which carries forward this exception.
*
* GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
***********************************************************************/
#ifndef GST_REAL_H
#define GST_REAL_H
#define SIGSZ 10
struct real {
/* Little-endian significant. sig[0] is the least significant part.
The 1 is not implicit, so in a normalized real sig[9] == 0 means
the value is zero. sig[9]'s MSB has weight 2^exp. */
unsigned short sig[SIGSZ];
int exp;
int sign;
};
/* Convert an integer number S to floating point and move it to OUT. */
extern void _gst_real_from_int (struct real *out, int s);
/* Sum S to R and store the result into R. */
extern void _gst_real_add_int (struct real *r, int s)
ATTRIBUTE_HIDDEN;
/* Multiply R by S and store the result into R. */
extern void _gst_real_mul_int (struct real *r, int s)
ATTRIBUTE_HIDDEN;
/* Compute R^S and store the result into R. */
extern void _gst_real_powi (struct real *out, struct real *r, int s)
ATTRIBUTE_HIDDEN;
/* Sum S to R and store the result into R. */
extern void _gst_real_add (struct real *r, struct real *s)
ATTRIBUTE_HIDDEN;
/* Multiply R by S and store the result into R. */
extern void _gst_real_mul (struct real *r, struct real *s)
ATTRIBUTE_HIDDEN;
/* Divide R by S and store the result into OUT. */
extern void _gst_real_div (struct real *out, struct real *r, struct real *s)
ATTRIBUTE_HIDDEN;
/* Compute the inverse of R and store it into OUT (OUT and R can overlap). */
extern void _gst_real_inv (struct real *out, struct real *r)
ATTRIBUTE_HIDDEN;
/* Convert R to a long double and return it. */
extern long double _gst_real_get_ld (struct real *r)
ATTRIBUTE_HIDDEN;
#endif