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1da177e4 LT |
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 | |
50a23e6e JM |
15 | is available through the Web page |
16 | http://www.jhauser.us/arithmetic/SoftFloat-2b/SoftFloat-source.txt | |
1da177e4 LT |
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 | ||
1da177e4 LT |
35 | |
36 | /* | |
37 | ------------------------------------------------------------------------------- | |
38 | The macro `FLOATX80' must be defined to enable the extended double-precision | |
39 | floating-point format `floatx80'. If this macro is not defined, the | |
40 | `floatx80' type will not be defined, and none of the functions that either | |
41 | input or output the `floatx80' type will be defined. | |
42 | ------------------------------------------------------------------------------- | |
43 | */ | |
44 | #ifdef CONFIG_FPE_NWFPE_XP | |
45 | #define FLOATX80 | |
46 | #endif | |
47 | ||
48 | /* | |
49 | ------------------------------------------------------------------------------- | |
50 | Software IEC/IEEE floating-point types. | |
51 | ------------------------------------------------------------------------------- | |
52 | */ | |
bedf142b LB |
53 | typedef u32 float32; |
54 | typedef u64 float64; | |
1da177e4 | 55 | typedef struct { |
bedf142b LB |
56 | #ifdef __ARMEB__ |
57 | u16 __padding; | |
58 | u16 high; | |
59 | #else | |
60 | u16 high; | |
61 | u16 __padding; | |
62 | #endif | |
63 | u64 low; | |
a9da396a | 64 | } __attribute__ ((packed,aligned(4))) floatx80; |
1da177e4 LT |
65 | |
66 | /* | |
67 | ------------------------------------------------------------------------------- | |
68 | Software IEC/IEEE floating-point underflow tininess-detection mode. | |
69 | ------------------------------------------------------------------------------- | |
70 | */ | |
71 | extern signed char float_detect_tininess; | |
72 | enum { | |
73 | float_tininess_after_rounding = 0, | |
74 | float_tininess_before_rounding = 1 | |
75 | }; | |
76 | ||
77 | /* | |
78 | ------------------------------------------------------------------------------- | |
79 | Software IEC/IEEE floating-point rounding mode. | |
80 | ------------------------------------------------------------------------------- | |
81 | */ | |
f148af25 | 82 | //extern int8 float_rounding_mode; |
1da177e4 LT |
83 | enum { |
84 | float_round_nearest_even = 0, | |
85 | float_round_to_zero = 1, | |
86 | float_round_down = 2, | |
87 | float_round_up = 3 | |
88 | }; | |
89 | ||
90 | /* | |
91 | ------------------------------------------------------------------------------- | |
92 | Software IEC/IEEE floating-point exception flags. | |
93 | ------------------------------------------------------------------------------- | |
1da177e4 LT |
94 | enum { |
95 | float_flag_inexact = 1, | |
96 | float_flag_underflow = 2, | |
97 | float_flag_overflow = 4, | |
98 | float_flag_divbyzero = 8, | |
99 | float_flag_invalid = 16 | |
100 | }; | |
101 | ||
102 | ScottB: November 4, 1998 | |
103 | Changed the enumeration to match the bit order in the FPA11. | |
104 | */ | |
105 | ||
1da177e4 LT |
106 | enum { |
107 | float_flag_invalid = 1, | |
108 | float_flag_divbyzero = 2, | |
109 | float_flag_overflow = 4, | |
110 | float_flag_underflow = 8, | |
111 | float_flag_inexact = 16 | |
112 | }; | |
113 | ||
114 | /* | |
115 | ------------------------------------------------------------------------------- | |
116 | Routine to raise any or all of the software IEC/IEEE floating-point | |
117 | exception flags. | |
118 | ------------------------------------------------------------------------------- | |
119 | */ | |
120 | void float_raise( signed char ); | |
121 | ||
122 | /* | |
123 | ------------------------------------------------------------------------------- | |
124 | Software IEC/IEEE integer-to-floating-point conversion routines. | |
125 | ------------------------------------------------------------------------------- | |
126 | */ | |
f148af25 | 127 | float32 int32_to_float32( struct roundingData *, signed int ); |
1da177e4 LT |
128 | float64 int32_to_float64( signed int ); |
129 | #ifdef FLOATX80 | |
130 | floatx80 int32_to_floatx80( signed int ); | |
131 | #endif | |
132 | ||
133 | /* | |
134 | ------------------------------------------------------------------------------- | |
135 | Software IEC/IEEE single-precision conversion routines. | |
136 | ------------------------------------------------------------------------------- | |
137 | */ | |
f148af25 | 138 | signed int float32_to_int32( struct roundingData *, float32 ); |
1da177e4 LT |
139 | signed int float32_to_int32_round_to_zero( float32 ); |
140 | float64 float32_to_float64( float32 ); | |
141 | #ifdef FLOATX80 | |
142 | floatx80 float32_to_floatx80( float32 ); | |
143 | #endif | |
144 | ||
145 | /* | |
146 | ------------------------------------------------------------------------------- | |
147 | Software IEC/IEEE single-precision operations. | |
148 | ------------------------------------------------------------------------------- | |
149 | */ | |
f148af25 RP |
150 | float32 float32_round_to_int( struct roundingData*, float32 ); |
151 | float32 float32_add( struct roundingData *, float32, float32 ); | |
152 | float32 float32_sub( struct roundingData *, float32, float32 ); | |
153 | float32 float32_mul( struct roundingData *, float32, float32 ); | |
154 | float32 float32_div( struct roundingData *, float32, float32 ); | |
155 | float32 float32_rem( struct roundingData *, float32, float32 ); | |
156 | float32 float32_sqrt( struct roundingData*, float32 ); | |
1da177e4 LT |
157 | char float32_eq( float32, float32 ); |
158 | char float32_le( float32, float32 ); | |
159 | char float32_lt( float32, float32 ); | |
160 | char float32_eq_signaling( float32, float32 ); | |
161 | char float32_le_quiet( float32, float32 ); | |
162 | char float32_lt_quiet( float32, float32 ); | |
163 | char float32_is_signaling_nan( float32 ); | |
164 | ||
165 | /* | |
166 | ------------------------------------------------------------------------------- | |
167 | Software IEC/IEEE double-precision conversion routines. | |
168 | ------------------------------------------------------------------------------- | |
169 | */ | |
f148af25 | 170 | signed int float64_to_int32( struct roundingData *, float64 ); |
1da177e4 | 171 | signed int float64_to_int32_round_to_zero( float64 ); |
f148af25 | 172 | float32 float64_to_float32( struct roundingData *, float64 ); |
1da177e4 LT |
173 | #ifdef FLOATX80 |
174 | floatx80 float64_to_floatx80( float64 ); | |
175 | #endif | |
176 | ||
177 | /* | |
178 | ------------------------------------------------------------------------------- | |
179 | Software IEC/IEEE double-precision operations. | |
180 | ------------------------------------------------------------------------------- | |
181 | */ | |
f148af25 RP |
182 | float64 float64_round_to_int( struct roundingData *, float64 ); |
183 | float64 float64_add( struct roundingData *, float64, float64 ); | |
184 | float64 float64_sub( struct roundingData *, float64, float64 ); | |
185 | float64 float64_mul( struct roundingData *, float64, float64 ); | |
186 | float64 float64_div( struct roundingData *, float64, float64 ); | |
187 | float64 float64_rem( struct roundingData *, float64, float64 ); | |
188 | float64 float64_sqrt( struct roundingData *, float64 ); | |
1da177e4 LT |
189 | char float64_eq( float64, float64 ); |
190 | char float64_le( float64, float64 ); | |
191 | char float64_lt( float64, float64 ); | |
192 | char float64_eq_signaling( float64, float64 ); | |
193 | char float64_le_quiet( float64, float64 ); | |
194 | char float64_lt_quiet( float64, float64 ); | |
195 | char float64_is_signaling_nan( float64 ); | |
196 | ||
197 | #ifdef FLOATX80 | |
198 | ||
199 | /* | |
200 | ------------------------------------------------------------------------------- | |
201 | Software IEC/IEEE extended double-precision conversion routines. | |
202 | ------------------------------------------------------------------------------- | |
203 | */ | |
f148af25 | 204 | signed int floatx80_to_int32( struct roundingData *, floatx80 ); |
1da177e4 | 205 | signed int floatx80_to_int32_round_to_zero( floatx80 ); |
f148af25 RP |
206 | float32 floatx80_to_float32( struct roundingData *, floatx80 ); |
207 | float64 floatx80_to_float64( struct roundingData *, floatx80 ); | |
1da177e4 LT |
208 | |
209 | /* | |
210 | ------------------------------------------------------------------------------- | |
211 | Software IEC/IEEE extended double-precision operations. | |
212 | ------------------------------------------------------------------------------- | |
213 | */ | |
f148af25 RP |
214 | floatx80 floatx80_round_to_int( struct roundingData *, floatx80 ); |
215 | floatx80 floatx80_add( struct roundingData *, floatx80, floatx80 ); | |
216 | floatx80 floatx80_sub( struct roundingData *, floatx80, floatx80 ); | |
217 | floatx80 floatx80_mul( struct roundingData *, floatx80, floatx80 ); | |
218 | floatx80 floatx80_div( struct roundingData *, floatx80, floatx80 ); | |
219 | floatx80 floatx80_rem( struct roundingData *, floatx80, floatx80 ); | |
220 | floatx80 floatx80_sqrt( struct roundingData *, floatx80 ); | |
1da177e4 LT |
221 | char floatx80_eq( floatx80, floatx80 ); |
222 | char floatx80_le( floatx80, floatx80 ); | |
223 | char floatx80_lt( floatx80, floatx80 ); | |
224 | char floatx80_eq_signaling( floatx80, floatx80 ); | |
225 | char floatx80_le_quiet( floatx80, floatx80 ); | |
226 | char floatx80_lt_quiet( floatx80, floatx80 ); | |
227 | char floatx80_is_signaling_nan( floatx80 ); | |
228 | ||
3ea385f0 BD |
229 | extern flag floatx80_is_nan(floatx80); |
230 | ||
1da177e4 LT |
231 | #endif |
232 | ||
233 | static inline flag extractFloat32Sign(float32 a) | |
234 | { | |
235 | return a >> 31; | |
236 | } | |
237 | ||
238 | static inline flag float32_eq_nocheck(float32 a, float32 b) | |
239 | { | |
240 | return (a == b) || ((bits32) ((a | b) << 1) == 0); | |
241 | } | |
242 | ||
243 | static inline flag float32_lt_nocheck(float32 a, float32 b) | |
244 | { | |
245 | flag aSign, bSign; | |
246 | ||
247 | aSign = extractFloat32Sign(a); | |
248 | bSign = extractFloat32Sign(b); | |
249 | if (aSign != bSign) | |
250 | return aSign && ((bits32) ((a | b) << 1) != 0); | |
251 | return (a != b) && (aSign ^ (a < b)); | |
252 | } | |
253 | ||
254 | static inline flag extractFloat64Sign(float64 a) | |
255 | { | |
256 | return a >> 63; | |
257 | } | |
258 | ||
259 | static inline flag float64_eq_nocheck(float64 a, float64 b) | |
260 | { | |
261 | return (a == b) || ((bits64) ((a | b) << 1) == 0); | |
262 | } | |
263 | ||
264 | static inline flag float64_lt_nocheck(float64 a, float64 b) | |
265 | { | |
266 | flag aSign, bSign; | |
267 | ||
268 | aSign = extractFloat64Sign(a); | |
269 | bSign = extractFloat64Sign(b); | |
270 | if (aSign != bSign) | |
271 | return aSign && ((bits64) ((a | b) << 1) != 0); | |
272 | return (a != b) && (aSign ^ (a < b)); | |
273 | } | |
274 | ||
6ec5e7f3 BD |
275 | extern flag float32_is_nan( float32 a ); |
276 | extern flag float64_is_nan( float64 a ); | |
277 | ||
1ff08288 BD |
278 | extern int32 float64_to_uint32( struct roundingData *roundData, float64 a ); |
279 | extern int32 float64_to_uint32_round_to_zero( float64 a ); | |
280 | ||
1da177e4 | 281 | #endif |