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1
2/*
3===============================================================================
4
5This C header file is part of the SoftFloat IEC/IEEE Floating-point
6Arithmetic Package, Release 2.
7
8Written by John R. Hauser. This work was made possible in part by the
9International Computer Science Institute, located at Suite 600, 1947 Center
10Street, Berkeley, California 94704. Funding was partially provided by the
11National Science Foundation under grant MIP-9311980. The original version
12of this code was written as part of a project to build a fixed-point vector
13processor in collaboration with the University of California at Berkeley,
14overseen by Profs. Nelson Morgan and John Wawrzynek. More information
15is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
16arithmetic/softfloat.html'.
17
18THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
19has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
20TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
21PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
22AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
23
24Derivative works are acceptable, even for commercial purposes, so long as
25(1) they include prominent notice that the work is derivative, and (2) they
26include prominent notice akin to these three paragraphs for those parts of
27this code that are retained.
28
29===============================================================================
30*/
31
32#ifndef __SOFTFLOAT_H__
33#define __SOFTFLOAT_H__
34
35#include <linux/config.h>
36
37/*
38-------------------------------------------------------------------------------
39The macro `FLOATX80' must be defined to enable the extended double-precision
40floating-point format `floatx80'. If this macro is not defined, the
41`floatx80' type will not be defined, and none of the functions that either
42input or output the `floatx80' type will be defined.
43-------------------------------------------------------------------------------
44*/
45#ifdef CONFIG_FPE_NWFPE_XP
46#define FLOATX80
47#endif
48
49/*
50-------------------------------------------------------------------------------
51Software IEC/IEEE floating-point types.
52-------------------------------------------------------------------------------
53*/
54typedef unsigned long int float32;
55typedef unsigned long long float64;
56typedef struct {
57 unsigned short high;
58 unsigned long long low;
59} floatx80;
60
61/*
62-------------------------------------------------------------------------------
63Software IEC/IEEE floating-point underflow tininess-detection mode.
64-------------------------------------------------------------------------------
65*/
66extern signed char float_detect_tininess;
67enum {
68 float_tininess_after_rounding = 0,
69 float_tininess_before_rounding = 1
70};
71
72/*
73-------------------------------------------------------------------------------
74Software IEC/IEEE floating-point rounding mode.
75-------------------------------------------------------------------------------
76*/
77extern signed char float_rounding_mode;
78enum {
79 float_round_nearest_even = 0,
80 float_round_to_zero = 1,
81 float_round_down = 2,
82 float_round_up = 3
83};
84
85/*
86-------------------------------------------------------------------------------
87Software IEC/IEEE floating-point exception flags.
88-------------------------------------------------------------------------------
89extern signed char float_exception_flags;
90enum {
91 float_flag_inexact = 1,
92 float_flag_underflow = 2,
93 float_flag_overflow = 4,
94 float_flag_divbyzero = 8,
95 float_flag_invalid = 16
96};
97
98ScottB: November 4, 1998
99Changed the enumeration to match the bit order in the FPA11.
100*/
101
102extern signed char float_exception_flags;
103enum {
104 float_flag_invalid = 1,
105 float_flag_divbyzero = 2,
106 float_flag_overflow = 4,
107 float_flag_underflow = 8,
108 float_flag_inexact = 16
109};
110
111/*
112-------------------------------------------------------------------------------
113Routine to raise any or all of the software IEC/IEEE floating-point
114exception flags.
115-------------------------------------------------------------------------------
116*/
117void float_raise( signed char );
118
119/*
120-------------------------------------------------------------------------------
121Software IEC/IEEE integer-to-floating-point conversion routines.
122-------------------------------------------------------------------------------
123*/
124float32 int32_to_float32( signed int );
125float64 int32_to_float64( signed int );
126#ifdef FLOATX80
127floatx80 int32_to_floatx80( signed int );
128#endif
129
130/*
131-------------------------------------------------------------------------------
132Software IEC/IEEE single-precision conversion routines.
133-------------------------------------------------------------------------------
134*/
135signed int float32_to_int32( float32 );
136signed int float32_to_int32_round_to_zero( float32 );
137float64 float32_to_float64( float32 );
138#ifdef FLOATX80
139floatx80 float32_to_floatx80( float32 );
140#endif
141
142/*
143-------------------------------------------------------------------------------
144Software IEC/IEEE single-precision operations.
145-------------------------------------------------------------------------------
146*/
147float32 float32_round_to_int( float32 );
148float32 float32_add( float32, float32 );
149float32 float32_sub( float32, float32 );
150float32 float32_mul( float32, float32 );
151float32 float32_div( float32, float32 );
152float32 float32_rem( float32, float32 );
153float32 float32_sqrt( float32 );
154char float32_eq( float32, float32 );
155char float32_le( float32, float32 );
156char float32_lt( float32, float32 );
157char float32_eq_signaling( float32, float32 );
158char float32_le_quiet( float32, float32 );
159char float32_lt_quiet( float32, float32 );
160char float32_is_signaling_nan( float32 );
161
162/*
163-------------------------------------------------------------------------------
164Software IEC/IEEE double-precision conversion routines.
165-------------------------------------------------------------------------------
166*/
167signed int float64_to_int32( float64 );
168signed int float64_to_int32_round_to_zero( float64 );
169float32 float64_to_float32( float64 );
170#ifdef FLOATX80
171floatx80 float64_to_floatx80( float64 );
172#endif
173
174/*
175-------------------------------------------------------------------------------
176Software IEC/IEEE double-precision operations.
177-------------------------------------------------------------------------------
178*/
179float64 float64_round_to_int( float64 );
180float64 float64_add( float64, float64 );
181float64 float64_sub( float64, float64 );
182float64 float64_mul( float64, float64 );
183float64 float64_div( float64, float64 );
184float64 float64_rem( float64, float64 );
185float64 float64_sqrt( float64 );
186char float64_eq( float64, float64 );
187char float64_le( float64, float64 );
188char float64_lt( float64, float64 );
189char float64_eq_signaling( float64, float64 );
190char float64_le_quiet( float64, float64 );
191char float64_lt_quiet( float64, float64 );
192char float64_is_signaling_nan( float64 );
193
194#ifdef FLOATX80
195
196/*
197-------------------------------------------------------------------------------
198Software IEC/IEEE extended double-precision conversion routines.
199-------------------------------------------------------------------------------
200*/
201signed int floatx80_to_int32( floatx80 );
202signed int floatx80_to_int32_round_to_zero( floatx80 );
203float32 floatx80_to_float32( floatx80 );
204float64 floatx80_to_float64( floatx80 );
205
206/*
207-------------------------------------------------------------------------------
208Software IEC/IEEE extended double-precision rounding precision. Valid
209values are 32, 64, and 80.
210-------------------------------------------------------------------------------
211*/
212extern signed char floatx80_rounding_precision;
213
214/*
215-------------------------------------------------------------------------------
216Software IEC/IEEE extended double-precision operations.
217-------------------------------------------------------------------------------
218*/
219floatx80 floatx80_round_to_int( floatx80 );
220floatx80 floatx80_add( floatx80, floatx80 );
221floatx80 floatx80_sub( floatx80, floatx80 );
222floatx80 floatx80_mul( floatx80, floatx80 );
223floatx80 floatx80_div( floatx80, floatx80 );
224floatx80 floatx80_rem( floatx80, floatx80 );
225floatx80 floatx80_sqrt( floatx80 );
226char floatx80_eq( floatx80, floatx80 );
227char floatx80_le( floatx80, floatx80 );
228char floatx80_lt( floatx80, floatx80 );
229char floatx80_eq_signaling( floatx80, floatx80 );
230char floatx80_le_quiet( floatx80, floatx80 );
231char floatx80_lt_quiet( floatx80, floatx80 );
232char floatx80_is_signaling_nan( floatx80 );
233
234#endif
235
236static inline flag extractFloat32Sign(float32 a)
237{
238 return a >> 31;
239}
240
241static inline flag float32_eq_nocheck(float32 a, float32 b)
242{
243 return (a == b) || ((bits32) ((a | b) << 1) == 0);
244}
245
246static inline flag float32_lt_nocheck(float32 a, float32 b)
247{
248 flag aSign, bSign;
249
250 aSign = extractFloat32Sign(a);
251 bSign = extractFloat32Sign(b);
252 if (aSign != bSign)
253 return aSign && ((bits32) ((a | b) << 1) != 0);
254 return (a != b) && (aSign ^ (a < b));
255}
256
257static inline flag extractFloat64Sign(float64 a)
258{
259 return a >> 63;
260}
261
262static inline flag float64_eq_nocheck(float64 a, float64 b)
263{
264 return (a == b) || ((bits64) ((a | b) << 1) == 0);
265}
266
267static inline flag float64_lt_nocheck(float64 a, float64 b)
268{
269 flag aSign, bSign;
270
271 aSign = extractFloat64Sign(a);
272 bSign = extractFloat64Sign(b);
273 if (aSign != bSign)
274 return aSign && ((bits64) ((a | b) << 1) != 0);
275 return (a != b) && (aSign ^ (a < b));
276}
277
278#endif