root / target-arm / nwfpe / softfloat.h @ a8d3431a
History | View | Annotate | Download (8.3 kB)
1 |
|
---|---|
2 |
/*
|
3 |
===============================================================================
|
4 |
|
5 |
This C header file is part of the SoftFloat IEC/IEEE Floating-point
|
6 |
Arithmetic Package, Release 2.
|
7 |
|
8 |
Written by John R. Hauser. This work was made possible in part by the
|
9 |
International Computer Science Institute, located at Suite 600, 1947 Center
|
10 |
Street, Berkeley, California 94704. Funding was partially provided by the
|
11 |
National Science Foundation under grant MIP-9311980. The original version
|
12 |
of this code was written as part of a project to build a fixed-point vector
|
13 |
processor in collaboration with the University of California at Berkeley,
|
14 |
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
15 |
is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
|
16 |
arithmetic/softfloat.html'.
|
17 |
|
18 |
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
19 |
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
20 |
TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
21 |
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
22 |
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
23 |
|
24 |
Derivative works are acceptable, even for commercial purposes, so long as
|
25 |
(1) they include prominent notice that the work is derivative, and (2) they
|
26 |
include prominent notice akin to these three paragraphs for those parts of
|
27 |
this code that are retained.
|
28 |
|
29 |
===============================================================================
|
30 |
*/
|
31 |
|
32 |
#ifndef __SOFTFLOAT_H__
|
33 |
#define __SOFTFLOAT_H__
|
34 |
|
35 |
/*
|
36 |
-------------------------------------------------------------------------------
|
37 |
The macro `FLOATX80' must be defined to enable the extended double-precision
|
38 |
floating-point format `floatx80'. If this macro is not defined, the
|
39 |
`floatx80' type will not be defined, and none of the functions that either
|
40 |
input or output the `floatx80' type will be defined.
|
41 |
-------------------------------------------------------------------------------
|
42 |
*/
|
43 |
#define FLOATX80
|
44 |
|
45 |
/*
|
46 |
-------------------------------------------------------------------------------
|
47 |
Software IEC/IEEE floating-point types.
|
48 |
-------------------------------------------------------------------------------
|
49 |
*/
|
50 |
typedef unsigned long int float32; |
51 |
typedef unsigned long long float64; |
52 |
typedef struct { |
53 |
unsigned short high; |
54 |
unsigned long long low; |
55 |
} floatx80; |
56 |
|
57 |
/*
|
58 |
-------------------------------------------------------------------------------
|
59 |
Software IEC/IEEE floating-point underflow tininess-detection mode.
|
60 |
-------------------------------------------------------------------------------
|
61 |
*/
|
62 |
extern signed char float_detect_tininess; |
63 |
enum {
|
64 |
float_tininess_after_rounding = 0,
|
65 |
float_tininess_before_rounding = 1
|
66 |
}; |
67 |
|
68 |
/*
|
69 |
-------------------------------------------------------------------------------
|
70 |
Software IEC/IEEE floating-point rounding mode.
|
71 |
-------------------------------------------------------------------------------
|
72 |
*/
|
73 |
extern signed char float_rounding_mode; |
74 |
enum {
|
75 |
float_round_nearest_even = 0,
|
76 |
float_round_to_zero = 1,
|
77 |
float_round_down = 2,
|
78 |
float_round_up = 3
|
79 |
}; |
80 |
|
81 |
/*
|
82 |
-------------------------------------------------------------------------------
|
83 |
Software IEC/IEEE floating-point exception flags.
|
84 |
-------------------------------------------------------------------------------
|
85 |
extern signed char float_exception_flags;
|
86 |
enum {
|
87 |
float_flag_inexact = 1,
|
88 |
float_flag_underflow = 2,
|
89 |
float_flag_overflow = 4,
|
90 |
float_flag_divbyzero = 8,
|
91 |
float_flag_invalid = 16
|
92 |
};
|
93 |
|
94 |
ScottB: November 4, 1998
|
95 |
Changed the enumeration to match the bit order in the FPA11.
|
96 |
*/
|
97 |
|
98 |
extern signed char float_exception_flags; |
99 |
enum {
|
100 |
float_flag_invalid = 1,
|
101 |
float_flag_divbyzero = 2,
|
102 |
float_flag_overflow = 4,
|
103 |
float_flag_underflow = 8,
|
104 |
float_flag_inexact = 16
|
105 |
}; |
106 |
|
107 |
/*
|
108 |
-------------------------------------------------------------------------------
|
109 |
Routine to raise any or all of the software IEC/IEEE floating-point
|
110 |
exception flags.
|
111 |
-------------------------------------------------------------------------------
|
112 |
*/
|
113 |
void float_raise( signed char ); |
114 |
|
115 |
/*
|
116 |
-------------------------------------------------------------------------------
|
117 |
Software IEC/IEEE integer-to-floating-point conversion routines.
|
118 |
-------------------------------------------------------------------------------
|
119 |
*/
|
120 |
float32 int32_to_float32( signed int ); |
121 |
float64 int32_to_float64( signed int ); |
122 |
#ifdef FLOATX80
|
123 |
floatx80 int32_to_floatx80( signed int ); |
124 |
#endif
|
125 |
|
126 |
/*
|
127 |
-------------------------------------------------------------------------------
|
128 |
Software IEC/IEEE single-precision conversion routines.
|
129 |
-------------------------------------------------------------------------------
|
130 |
*/
|
131 |
signed int float32_to_int32( float32 ); |
132 |
signed int float32_to_int32_round_to_zero( float32 ); |
133 |
float64 float32_to_float64( float32 ); |
134 |
#ifdef FLOATX80
|
135 |
floatx80 float32_to_floatx80( float32 ); |
136 |
#endif
|
137 |
|
138 |
/*
|
139 |
-------------------------------------------------------------------------------
|
140 |
Software IEC/IEEE single-precision operations.
|
141 |
-------------------------------------------------------------------------------
|
142 |
*/
|
143 |
float32 float32_round_to_int( float32 ); |
144 |
float32 float32_add( float32, float32 ); |
145 |
float32 float32_sub( float32, float32 ); |
146 |
float32 float32_mul( float32, float32 ); |
147 |
float32 float32_div( float32, float32 ); |
148 |
float32 float32_rem( float32, float32 ); |
149 |
float32 float32_sqrt( float32 ); |
150 |
char float32_eq( float32, float32 );
|
151 |
char float32_le( float32, float32 );
|
152 |
char float32_lt( float32, float32 );
|
153 |
char float32_eq_signaling( float32, float32 );
|
154 |
char float32_le_quiet( float32, float32 );
|
155 |
char float32_lt_quiet( float32, float32 );
|
156 |
char float32_is_signaling_nan( float32 );
|
157 |
|
158 |
/*
|
159 |
-------------------------------------------------------------------------------
|
160 |
Software IEC/IEEE double-precision conversion routines.
|
161 |
-------------------------------------------------------------------------------
|
162 |
*/
|
163 |
signed int float64_to_int32( float64 ); |
164 |
signed int float64_to_int32_round_to_zero( float64 ); |
165 |
float32 float64_to_float32( float64 ); |
166 |
#ifdef FLOATX80
|
167 |
floatx80 float64_to_floatx80( float64 ); |
168 |
#endif
|
169 |
|
170 |
/*
|
171 |
-------------------------------------------------------------------------------
|
172 |
Software IEC/IEEE double-precision operations.
|
173 |
-------------------------------------------------------------------------------
|
174 |
*/
|
175 |
float64 float64_round_to_int( float64 ); |
176 |
float64 float64_add( float64, float64 ); |
177 |
float64 float64_sub( float64, float64 ); |
178 |
float64 float64_mul( float64, float64 ); |
179 |
float64 float64_div( float64, float64 ); |
180 |
float64 float64_rem( float64, float64 ); |
181 |
float64 float64_sqrt( float64 ); |
182 |
char float64_eq( float64, float64 );
|
183 |
char float64_le( float64, float64 );
|
184 |
char float64_lt( float64, float64 );
|
185 |
char float64_eq_signaling( float64, float64 );
|
186 |
char float64_le_quiet( float64, float64 );
|
187 |
char float64_lt_quiet( float64, float64 );
|
188 |
char float64_is_signaling_nan( float64 );
|
189 |
|
190 |
#ifdef FLOATX80
|
191 |
|
192 |
/*
|
193 |
-------------------------------------------------------------------------------
|
194 |
Software IEC/IEEE extended double-precision conversion routines.
|
195 |
-------------------------------------------------------------------------------
|
196 |
*/
|
197 |
signed int floatx80_to_int32( floatx80 ); |
198 |
signed int floatx80_to_int32_round_to_zero( floatx80 ); |
199 |
float32 floatx80_to_float32( floatx80 ); |
200 |
float64 floatx80_to_float64( floatx80 ); |
201 |
|
202 |
/*
|
203 |
-------------------------------------------------------------------------------
|
204 |
Software IEC/IEEE extended double-precision rounding precision. Valid
|
205 |
values are 32, 64, and 80.
|
206 |
-------------------------------------------------------------------------------
|
207 |
*/
|
208 |
extern signed char floatx80_rounding_precision; |
209 |
|
210 |
/*
|
211 |
-------------------------------------------------------------------------------
|
212 |
Software IEC/IEEE extended double-precision operations.
|
213 |
-------------------------------------------------------------------------------
|
214 |
*/
|
215 |
floatx80 floatx80_round_to_int( floatx80 ); |
216 |
floatx80 floatx80_add( floatx80, floatx80 ); |
217 |
floatx80 floatx80_sub( floatx80, floatx80 ); |
218 |
floatx80 floatx80_mul( floatx80, floatx80 ); |
219 |
floatx80 floatx80_div( floatx80, floatx80 ); |
220 |
floatx80 floatx80_rem( floatx80, floatx80 ); |
221 |
floatx80 floatx80_sqrt( floatx80 ); |
222 |
char floatx80_eq( floatx80, floatx80 );
|
223 |
char floatx80_le( floatx80, floatx80 );
|
224 |
char floatx80_lt( floatx80, floatx80 );
|
225 |
char floatx80_eq_signaling( floatx80, floatx80 );
|
226 |
char floatx80_le_quiet( floatx80, floatx80 );
|
227 |
char floatx80_lt_quiet( floatx80, floatx80 );
|
228 |
char floatx80_is_signaling_nan( floatx80 );
|
229 |
|
230 |
#endif
|
231 |
|
232 |
#endif
|