3 ===============================================================================
5 This C header file is part of the SoftFloat IEC/IEEE Floating-point
6 Arithmetic Package, Release 2.
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'.
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.
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.
29 ===============================================================================
32 #ifndef __SOFTFLOAT_H__
33 #define __SOFTFLOAT_H__
35 #include <linux/config.h>
38 -------------------------------------------------------------------------------
39 The macro `FLOATX80' must be defined to enable the extended double-precision
40 floating-point format `floatx80'. If this macro is not defined, the
41 `floatx80' type will not be defined, and none of the functions that either
42 input or output the `floatx80' type will be defined.
43 -------------------------------------------------------------------------------
45 #ifdef CONFIG_FPE_NWFPE_XP
50 -------------------------------------------------------------------------------
51 Software IEC/IEEE floating-point types.
52 -------------------------------------------------------------------------------
68 -------------------------------------------------------------------------------
69 Software IEC/IEEE floating-point underflow tininess-detection mode.
70 -------------------------------------------------------------------------------
72 extern signed char float_detect_tininess
;
74 float_tininess_after_rounding
= 0,
75 float_tininess_before_rounding
= 1
79 -------------------------------------------------------------------------------
80 Software IEC/IEEE floating-point rounding mode.
81 -------------------------------------------------------------------------------
83 //extern int8 float_rounding_mode;
85 float_round_nearest_even
= 0,
86 float_round_to_zero
= 1,
92 -------------------------------------------------------------------------------
93 Software IEC/IEEE floating-point exception flags.
94 -------------------------------------------------------------------------------
96 float_flag_inexact = 1,
97 float_flag_underflow = 2,
98 float_flag_overflow = 4,
99 float_flag_divbyzero = 8,
100 float_flag_invalid = 16
103 ScottB: November 4, 1998
104 Changed the enumeration to match the bit order in the FPA11.
108 float_flag_invalid
= 1,
109 float_flag_divbyzero
= 2,
110 float_flag_overflow
= 4,
111 float_flag_underflow
= 8,
112 float_flag_inexact
= 16
116 -------------------------------------------------------------------------------
117 Routine to raise any or all of the software IEC/IEEE floating-point
119 -------------------------------------------------------------------------------
121 void float_raise( signed char );
124 -------------------------------------------------------------------------------
125 Software IEC/IEEE integer-to-floating-point conversion routines.
126 -------------------------------------------------------------------------------
128 float32
int32_to_float32( struct roundingData
*, signed int );
129 float64
int32_to_float64( signed int );
131 floatx80
int32_to_floatx80( signed int );
135 -------------------------------------------------------------------------------
136 Software IEC/IEEE single-precision conversion routines.
137 -------------------------------------------------------------------------------
139 signed int float32_to_int32( struct roundingData
*, float32
);
140 signed int float32_to_int32_round_to_zero( float32
);
141 float64
float32_to_float64( float32
);
143 floatx80
float32_to_floatx80( float32
);
147 -------------------------------------------------------------------------------
148 Software IEC/IEEE single-precision operations.
149 -------------------------------------------------------------------------------
151 float32
float32_round_to_int( struct roundingData
*, float32
);
152 float32
float32_add( struct roundingData
*, float32
, float32
);
153 float32
float32_sub( struct roundingData
*, float32
, float32
);
154 float32
float32_mul( struct roundingData
*, float32
, float32
);
155 float32
float32_div( struct roundingData
*, float32
, float32
);
156 float32
float32_rem( struct roundingData
*, float32
, float32
);
157 float32
float32_sqrt( struct roundingData
*, float32
);
158 char float32_eq( float32
, float32
);
159 char float32_le( float32
, float32
);
160 char float32_lt( float32
, float32
);
161 char float32_eq_signaling( float32
, float32
);
162 char float32_le_quiet( float32
, float32
);
163 char float32_lt_quiet( float32
, float32
);
164 char float32_is_signaling_nan( float32
);
167 -------------------------------------------------------------------------------
168 Software IEC/IEEE double-precision conversion routines.
169 -------------------------------------------------------------------------------
171 signed int float64_to_int32( struct roundingData
*, float64
);
172 signed int float64_to_int32_round_to_zero( float64
);
173 float32
float64_to_float32( struct roundingData
*, float64
);
175 floatx80
float64_to_floatx80( float64
);
179 -------------------------------------------------------------------------------
180 Software IEC/IEEE double-precision operations.
181 -------------------------------------------------------------------------------
183 float64
float64_round_to_int( struct roundingData
*, float64
);
184 float64
float64_add( struct roundingData
*, float64
, float64
);
185 float64
float64_sub( struct roundingData
*, float64
, float64
);
186 float64
float64_mul( struct roundingData
*, float64
, float64
);
187 float64
float64_div( struct roundingData
*, float64
, float64
);
188 float64
float64_rem( struct roundingData
*, float64
, float64
);
189 float64
float64_sqrt( struct roundingData
*, float64
);
190 char float64_eq( float64
, float64
);
191 char float64_le( float64
, float64
);
192 char float64_lt( float64
, float64
);
193 char float64_eq_signaling( float64
, float64
);
194 char float64_le_quiet( float64
, float64
);
195 char float64_lt_quiet( float64
, float64
);
196 char float64_is_signaling_nan( float64
);
201 -------------------------------------------------------------------------------
202 Software IEC/IEEE extended double-precision conversion routines.
203 -------------------------------------------------------------------------------
205 signed int floatx80_to_int32( struct roundingData
*, floatx80
);
206 signed int floatx80_to_int32_round_to_zero( floatx80
);
207 float32
floatx80_to_float32( struct roundingData
*, floatx80
);
208 float64
floatx80_to_float64( struct roundingData
*, floatx80
);
211 -------------------------------------------------------------------------------
212 Software IEC/IEEE extended double-precision operations.
213 -------------------------------------------------------------------------------
215 floatx80
floatx80_round_to_int( struct roundingData
*, floatx80
);
216 floatx80
floatx80_add( struct roundingData
*, floatx80
, floatx80
);
217 floatx80
floatx80_sub( struct roundingData
*, floatx80
, floatx80
);
218 floatx80
floatx80_mul( struct roundingData
*, floatx80
, floatx80
);
219 floatx80
floatx80_div( struct roundingData
*, floatx80
, floatx80
);
220 floatx80
floatx80_rem( struct roundingData
*, floatx80
, floatx80
);
221 floatx80
floatx80_sqrt( struct roundingData
*, 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
);
232 static inline flag
extractFloat32Sign(float32 a
)
237 static inline flag
float32_eq_nocheck(float32 a
, float32 b
)
239 return (a
== b
) || ((bits32
) ((a
| b
) << 1) == 0);
242 static inline flag
float32_lt_nocheck(float32 a
, float32 b
)
246 aSign
= extractFloat32Sign(a
);
247 bSign
= extractFloat32Sign(b
);
249 return aSign
&& ((bits32
) ((a
| b
) << 1) != 0);
250 return (a
!= b
) && (aSign
^ (a
< b
));
253 static inline flag
extractFloat64Sign(float64 a
)
258 static inline flag
float64_eq_nocheck(float64 a
, float64 b
)
260 return (a
== b
) || ((bits64
) ((a
| b
) << 1) == 0);
263 static inline flag
float64_lt_nocheck(float64 a
, float64 b
)
267 aSign
= extractFloat64Sign(a
);
268 bSign
= extractFloat64Sign(b
);
270 return aSign
&& ((bits64
) ((a
| b
) << 1) != 0);
271 return (a
!= b
) && (aSign
^ (a
< b
));
274 extern flag
float32_is_nan( float32 a
);
275 extern flag
float64_is_nan( float64 a
);