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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 |