1 /* $NetBSD: softfloat.h,v 1.5 2013/07/18 21:30:40 matt Exp $ */
3 /* This is a derivative work. */
6 ===============================================================================
8 This C header file is part of the SoftFloat IEC/IEEE Floating-point
9 Arithmetic Package, Release 2a.
11 Written by John R. Hauser. This work was made possible in part by the
12 International Computer Science Institute, located at Suite 600, 1947 Center
13 Street, Berkeley, California 94704. Funding was partially provided by the
14 National Science Foundation under grant MIP-9311980. The original version
15 of this code was written as part of a project to build a fixed-point vector
16 processor in collaboration with the University of California at Berkeley,
17 overseen by Profs. Nelson Morgan and John Wawrzynek. More information
18 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
19 arithmetic/SoftFloat.html'.
21 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
22 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
23 TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
24 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
25 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
27 Derivative works are acceptable, even for commercial purposes, so long as
28 (1) they include prominent notice that the work is derivative, and (2) they
29 include prominent notice akin to these four paragraphs for those parts of
30 this code that are retained.
32 ===============================================================================
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. The same applies to
41 the `FLOAT128' macro and the quadruple-precision format `float128'.
42 -------------------------------------------------------------------------------
47 /* #define FLOAT128 */
49 #include <machine/ieeefp.h>
52 -------------------------------------------------------------------------------
53 Software IEC/IEEE floating-point types.
54 -------------------------------------------------------------------------------
56 typedef unsigned int float32
;
57 typedef unsigned long long float64
;
61 unsigned long long low
;
66 unsigned long long high
, low
;
71 -------------------------------------------------------------------------------
72 Software IEC/IEEE floating-point underflow tininess-detection mode.
73 -------------------------------------------------------------------------------
75 #ifndef SOFTFLOAT_FOR_GCC
76 extern int8 float_detect_tininess
;
79 float_tininess_after_rounding
= 0,
80 float_tininess_before_rounding
= 1
84 -------------------------------------------------------------------------------
85 Software IEC/IEEE floating-point rounding mode.
86 -------------------------------------------------------------------------------
88 extern fp_rnd float_rounding_mode
;
89 #define float_round_nearest_even FP_RN
90 #define float_round_to_zero FP_RZ
91 #define float_round_down FP_RM
92 #define float_round_up FP_RP
95 -------------------------------------------------------------------------------
96 Software IEC/IEEE floating-point exception flags.
97 -------------------------------------------------------------------------------
99 extern fp_except float_exception_flags
;
100 extern fp_except float_exception_mask
;
102 float_flag_inexact
= FP_X_IMP
,
103 float_flag_underflow
= FP_X_UFL
,
104 float_flag_overflow
= FP_X_OFL
,
105 float_flag_divbyzero
= FP_X_DZ
,
106 float_flag_invalid
= FP_X_INV
110 -------------------------------------------------------------------------------
111 Routine to raise any or all of the software IEC/IEEE floating-point
113 -------------------------------------------------------------------------------
115 void float_raise( fp_except
);
118 -------------------------------------------------------------------------------
119 Software IEC/IEEE integer-to-floating-point conversion routines.
120 -------------------------------------------------------------------------------
122 float32
int32_to_float32( int32
);
123 float32
uint32_to_float32( uint32
);
124 float64
int32_to_float64( int32
);
125 float64
uint32_to_float64( uint32
);
127 floatx80
int32_to_floatx80( int32
);
128 floatx80
uint32_to_floatx80( uint32
);
131 float128
int32_to_float128( int32
);
132 float128
uint32_to_float128( uint32
);
134 float32
int64_to_float32( long long );
135 float64
int64_to_float64( long long );
137 floatx80
int64_to_floatx80( long long );
140 float128
int64_to_float128( long long );
144 -------------------------------------------------------------------------------
145 Software IEC/IEEE single-precision conversion routines.
146 -------------------------------------------------------------------------------
148 int float32_to_int32( float32
);
149 int float32_to_int32_round_to_zero( float32
);
150 unsigned int float32_to_uint32_round_to_zero( float32
);
151 long long float32_to_int64( float32
);
152 long long float32_to_int64_round_to_zero( float32
);
153 float64
float32_to_float64( float32
);
155 floatx80
float32_to_floatx80( float32
);
158 float128
float32_to_float128( float32
);
162 -------------------------------------------------------------------------------
163 Software IEC/IEEE single-precision operations.
164 -------------------------------------------------------------------------------
166 float32
float32_round_to_int( float32
);
167 float32
float32_add( float32
, float32
);
168 float32
float32_sub( float32
, float32
);
169 float32
float32_mul( float32
, float32
);
170 float32
float32_div( float32
, float32
);
171 float32
float32_rem( float32
, float32
);
172 float32
float32_sqrt( float32
);
173 flag
float32_eq( float32
, float32
);
174 flag
float32_le( float32
, float32
);
175 flag
float32_lt( float32
, float32
);
176 flag
float32_eq_signaling( float32
, float32
);
177 flag
float32_le_quiet( float32
, float32
);
178 flag
float32_lt_quiet( float32
, float32
);
179 #ifndef SOFTFLOAT_FOR_GCC
180 flag
float32_is_signaling_nan( float32
);
184 -------------------------------------------------------------------------------
185 Software IEC/IEEE double-precision conversion routines.
186 -------------------------------------------------------------------------------
188 int float64_to_int32( float64
);
189 int float64_to_int32_round_to_zero( float64
);
190 unsigned int float64_to_uint32_round_to_zero( float64
);
191 long long float64_to_int64( float64
);
192 long long float64_to_int64_round_to_zero( float64
);
193 float32
float64_to_float32( float64
);
195 floatx80
float64_to_floatx80( float64
);
198 float128
float64_to_float128( float64
);
202 -------------------------------------------------------------------------------
203 Software IEC/IEEE double-precision operations.
204 -------------------------------------------------------------------------------
206 float64
float64_round_to_int( float64
);
207 float64
float64_add( float64
, float64
);
208 float64
float64_sub( float64
, float64
);
209 float64
float64_mul( float64
, float64
);
210 float64
float64_div( float64
, float64
);
211 float64
float64_rem( float64
, float64
);
212 float64
float64_sqrt( float64
);
213 flag
float64_eq( float64
, float64
);
214 flag
float64_le( float64
, float64
);
215 flag
float64_lt( float64
, float64
);
216 flag
float64_eq_signaling( float64
, float64
);
217 flag
float64_le_quiet( float64
, float64
);
218 flag
float64_lt_quiet( float64
, float64
);
219 flag
float64_is_signaling_nan( float64
);
224 -------------------------------------------------------------------------------
225 Software IEC/IEEE extended double-precision conversion routines.
226 -------------------------------------------------------------------------------
228 int floatx80_to_int32( floatx80
);
229 int floatx80_to_int32_round_to_zero( floatx80
);
230 long long floatx80_to_int64( floatx80
);
231 long long floatx80_to_int64_round_to_zero( floatx80
);
232 float32
floatx80_to_float32( floatx80
);
233 float64
floatx80_to_float64( floatx80
);
235 float128
floatx80_to_float128( floatx80
);
239 -------------------------------------------------------------------------------
240 Software IEC/IEEE extended double-precision rounding precision. Valid
241 values are 32, 64, and 80.
242 -------------------------------------------------------------------------------
244 extern int floatx80_rounding_precision
;
247 -------------------------------------------------------------------------------
248 Software IEC/IEEE extended double-precision operations.
249 -------------------------------------------------------------------------------
251 floatx80
floatx80_round_to_int( floatx80
);
252 floatx80
floatx80_add( floatx80
, floatx80
);
253 floatx80
floatx80_sub( floatx80
, floatx80
);
254 floatx80
floatx80_mul( floatx80
, floatx80
);
255 floatx80
floatx80_div( floatx80
, floatx80
);
256 floatx80
floatx80_rem( floatx80
, floatx80
);
257 floatx80
floatx80_sqrt( floatx80
);
258 flag
floatx80_eq( floatx80
, floatx80
);
259 flag
floatx80_le( floatx80
, floatx80
);
260 flag
floatx80_lt( floatx80
, floatx80
);
261 flag
floatx80_eq_signaling( floatx80
, floatx80
);
262 flag
floatx80_le_quiet( floatx80
, floatx80
);
263 flag
floatx80_lt_quiet( floatx80
, floatx80
);
264 flag
floatx80_is_signaling_nan( floatx80
);
265 flag
floatx80_is_nan( floatx80
);
272 -------------------------------------------------------------------------------
273 Software IEC/IEEE quadruple-precision conversion routines.
274 -------------------------------------------------------------------------------
276 int float128_to_int32( float128
);
277 int float128_to_int32_round_to_zero( float128
);
278 long long float128_to_int64( float128
);
279 long long float128_to_int64_round_to_zero( float128
);
280 float32
float128_to_float32( float128
);
281 float64
float128_to_float64( float128
);
283 floatx80
float128_to_floatx80( float128
);
287 -------------------------------------------------------------------------------
288 Software IEC/IEEE quadruple-precision operations.
289 -------------------------------------------------------------------------------
291 float128
float128_round_to_int( float128
);
292 float128
float128_add( float128
, float128
);
293 float128
float128_sub( float128
, float128
);
294 float128
float128_mul( float128
, float128
);
295 float128
float128_div( float128
, float128
);
296 float128
float128_rem( float128
, float128
);
297 float128
float128_sqrt( float128
);
298 flag
float128_eq( float128
, float128
);
299 flag
float128_le( float128
, float128
);
300 flag
float128_lt( float128
, float128
);
301 flag
float128_eq_signaling( float128
, float128
);
302 flag
float128_le_quiet( float128
, float128
);
303 flag
float128_lt_quiet( float128
, float128
);
304 flag
float128_is_signaling_nan( float128
);