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source: vbox/trunk/src/recompiler_new/fpu/softfloat.h@ 13382

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1/*============================================================================
2
3This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
4Package, Release 2b.
5
6Written by John R. Hauser. This work was made possible in part by the
7International Computer Science Institute, located at Suite 600, 1947 Center
8Street, Berkeley, California 94704. Funding was partially provided by the
9National Science Foundation under grant MIP-9311980. The original version
10of this code was written as part of a project to build a fixed-point vector
11processor in collaboration with the University of California at Berkeley,
12overseen by Profs. Nelson Morgan and John Wawrzynek. More information
13is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
14arithmetic/SoftFloat.html'.
15
16THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
17been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
18RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
19AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
20COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
21EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
22INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
23OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
24
25Derivative works are acceptable, even for commercial purposes, so long as
26(1) the source code for the derivative work includes prominent notice that
27the work is derivative, and (2) the source code includes prominent notice with
28these four paragraphs for those parts of this code that are retained.
29
30=============================================================================*/
31
32#ifndef SOFTFLOAT_H
33#define SOFTFLOAT_H
34
35#ifdef VBOX
36#ifndef _MSC_VER
37#include <inttypes.h>
38#endif
39#endif
40#include "config.h"
41
42/*----------------------------------------------------------------------------
43| Each of the following `typedef's defines the most convenient type that holds
44| integers of at least as many bits as specified. For example, `uint8' should
45| be the most convenient type that can hold unsigned integers of as many as
46| 8 bits. The `flag' type must be able to hold either a 0 or 1. For most
47| implementations of C, `flag', `uint8', and `int8' should all be `typedef'ed
48| to the same as `int'.
49*----------------------------------------------------------------------------*/
50typedef uint8_t flag;
51typedef uint8_t uint8;
52typedef int8_t int8;
53typedef int uint16;
54typedef int int16;
55typedef unsigned int uint32;
56typedef signed int int32;
57typedef uint64_t uint64;
58typedef int64_t int64;
59
60/*----------------------------------------------------------------------------
61| Each of the following `typedef's defines a type that holds integers
62| of _exactly_ the number of bits specified. For instance, for most
63| implementation of C, `bits16' and `sbits16' should be `typedef'ed to
64| `unsigned short int' and `signed short int' (or `short int'), respectively.
65*----------------------------------------------------------------------------*/
66typedef uint8_t bits8;
67typedef int8_t sbits8;
68typedef uint16_t bits16;
69typedef int16_t sbits16;
70typedef uint32_t bits32;
71typedef int32_t sbits32;
72typedef uint64_t bits64;
73typedef int64_t sbits64;
74
75#define LIT64( a ) a##LL
76#ifdef _MSC_VER
77#define INLINE
78#else
79#define INLINE static inline
80#endif
81
82/*----------------------------------------------------------------------------
83| The macro `FLOATX80' must be defined to enable the extended double-precision
84| floating-point format `floatx80'. If this macro is not defined, the
85| `floatx80' type will not be defined, and none of the functions that either
86| input or output the `floatx80' type will be defined. The same applies to
87| the `FLOAT128' macro and the quadruple-precision format `float128'.
88*----------------------------------------------------------------------------*/
89#ifdef CONFIG_SOFTFLOAT
90/* bit exact soft float support */
91#define FLOATX80
92#define FLOAT128
93#else
94/* native float support */
95#if (defined(__i386__) || defined(__x86_64__)) && (!defined(_BSD) || defined(VBOX))
96#define FLOATX80
97#endif
98#endif /* !CONFIG_SOFTFLOAT */
99#if defined(VBOX) && (!defined(FLOATX80) || defined(CONFIG_SOFTFLOAT))
100# error misconfigured
101#endif
102
103#define STATUS_PARAM , float_status *status
104#define STATUS(field) status->field
105#define STATUS_VAR , status
106
107/*----------------------------------------------------------------------------
108| Software IEC/IEEE floating-point ordering relations
109*----------------------------------------------------------------------------*/
110enum {
111 float_relation_less = -1,
112 float_relation_equal = 0,
113 float_relation_greater = 1,
114 float_relation_unordered = 2
115};
116
117#ifdef CONFIG_SOFTFLOAT
118/*----------------------------------------------------------------------------
119| Software IEC/IEEE floating-point types.
120*----------------------------------------------------------------------------*/
121typedef uint32_t float32;
122typedef uint64_t float64;
123#ifdef FLOATX80
124typedef struct {
125 uint64_t low;
126 uint16_t high;
127} floatx80;
128#endif
129#ifdef FLOAT128
130typedef struct {
131#ifdef WORDS_BIGENDIAN
132 uint64_t high, low;
133#else
134 uint64_t low, high;
135#endif
136} float128;
137#endif
138
139/*----------------------------------------------------------------------------
140| Software IEC/IEEE floating-point underflow tininess-detection mode.
141*----------------------------------------------------------------------------*/
142enum {
143 float_tininess_after_rounding = 0,
144 float_tininess_before_rounding = 1
145};
146
147/*----------------------------------------------------------------------------
148| Software IEC/IEEE floating-point rounding mode.
149*----------------------------------------------------------------------------*/
150enum {
151 float_round_nearest_even = 0,
152 float_round_down = 1,
153 float_round_up = 2,
154 float_round_to_zero = 3
155};
156
157/*----------------------------------------------------------------------------
158| Software IEC/IEEE floating-point exception flags.
159*----------------------------------------------------------------------------*/
160enum {
161 float_flag_invalid = 1,
162 float_flag_divbyzero = 4,
163 float_flag_overflow = 8,
164 float_flag_underflow = 16,
165 float_flag_inexact = 32
166};
167
168typedef struct float_status {
169 signed char float_detect_tininess;
170 signed char float_rounding_mode;
171 signed char float_exception_flags;
172#ifdef FLOATX80
173 signed char floatx80_rounding_precision;
174#endif
175} float_status;
176
177void set_float_rounding_mode(int val STATUS_PARAM);
178void set_float_exception_flags(int val STATUS_PARAM);
179INLINE int get_float_exception_flags(float_status *status)
180{
181 return STATUS(float_exception_flags);
182}
183#ifdef FLOATX80
184void set_floatx80_rounding_precision(int val STATUS_PARAM);
185#endif
186
187/*----------------------------------------------------------------------------
188| Routine to raise any or all of the software IEC/IEEE floating-point
189| exception flags.
190*----------------------------------------------------------------------------*/
191void float_raise( int8 flags STATUS_PARAM);
192
193/*----------------------------------------------------------------------------
194| Software IEC/IEEE integer-to-floating-point conversion routines.
195*----------------------------------------------------------------------------*/
196float32 int32_to_float32( int STATUS_PARAM );
197float64 int32_to_float64( int STATUS_PARAM );
198float32 uint32_to_float32( unsigned int STATUS_PARAM );
199float64 uint32_to_float64( unsigned int STATUS_PARAM );
200#ifdef FLOATX80
201floatx80 int32_to_floatx80( int STATUS_PARAM );
202#endif
203#ifdef FLOAT128
204float128 int32_to_float128( int STATUS_PARAM );
205#endif
206float32 int64_to_float32( int64_t STATUS_PARAM );
207float64 int64_to_float64( int64_t STATUS_PARAM );
208#ifdef FLOATX80
209floatx80 int64_to_floatx80( int64_t STATUS_PARAM );
210#endif
211#ifdef FLOAT128
212float128 int64_to_float128( int64_t STATUS_PARAM );
213#endif
214
215/*----------------------------------------------------------------------------
216| Software IEC/IEEE single-precision conversion routines.
217*----------------------------------------------------------------------------*/
218int float32_to_int32( float32 STATUS_PARAM );
219int float32_to_int32_round_to_zero( float32 STATUS_PARAM );
220unsigned int float32_to_uint32( float32 STATUS_PARAM );
221unsigned int float32_to_uint32_round_to_zero( float32 STATUS_PARAM );
222int64_t float32_to_int64( float32 STATUS_PARAM );
223int64_t float32_to_int64_round_to_zero( float32 STATUS_PARAM );
224float64 float32_to_float64( float32 STATUS_PARAM );
225#ifdef FLOATX80
226floatx80 float32_to_floatx80( float32 STATUS_PARAM );
227#endif
228#ifdef FLOAT128
229float128 float32_to_float128( float32 STATUS_PARAM );
230#endif
231
232/*----------------------------------------------------------------------------
233| Software IEC/IEEE single-precision operations.
234*----------------------------------------------------------------------------*/
235float32 float32_round_to_int( float32 STATUS_PARAM );
236float32 float32_add( float32, float32 STATUS_PARAM );
237float32 float32_sub( float32, float32 STATUS_PARAM );
238float32 float32_mul( float32, float32 STATUS_PARAM );
239float32 float32_div( float32, float32 STATUS_PARAM );
240float32 float32_rem( float32, float32 STATUS_PARAM );
241float32 float32_sqrt( float32 STATUS_PARAM );
242int float32_eq( float32, float32 STATUS_PARAM );
243int float32_le( float32, float32 STATUS_PARAM );
244int float32_lt( float32, float32 STATUS_PARAM );
245int float32_eq_signaling( float32, float32 STATUS_PARAM );
246int float32_le_quiet( float32, float32 STATUS_PARAM );
247int float32_lt_quiet( float32, float32 STATUS_PARAM );
248int float32_compare( float32, float32 STATUS_PARAM );
249int float32_compare_quiet( float32, float32 STATUS_PARAM );
250int float32_is_signaling_nan( float32 );
251int float64_is_nan( float64 a );
252
253INLINE float32 float32_abs(float32 a)
254{
255 return a & 0x7fffffff;
256}
257
258INLINE float32 float32_chs(float32 a)
259{
260 return a ^ 0x80000000;
261}
262
263/*----------------------------------------------------------------------------
264| Software IEC/IEEE double-precision conversion routines.
265*----------------------------------------------------------------------------*/
266int float64_to_int32( float64 STATUS_PARAM );
267int float64_to_int32_round_to_zero( float64 STATUS_PARAM );
268unsigned int float64_to_uint32( float64 STATUS_PARAM );
269unsigned int float64_to_uint32_round_to_zero( float64 STATUS_PARAM );
270int64_t float64_to_int64( float64 STATUS_PARAM );
271int64_t float64_to_int64_round_to_zero( float64 STATUS_PARAM );
272float32 float64_to_float32( float64 STATUS_PARAM );
273#ifdef FLOATX80
274floatx80 float64_to_floatx80( float64 STATUS_PARAM );
275#endif
276#ifdef FLOAT128
277float128 float64_to_float128( float64 STATUS_PARAM );
278#endif
279
280/*----------------------------------------------------------------------------
281| Software IEC/IEEE double-precision operations.
282*----------------------------------------------------------------------------*/
283float64 float64_round_to_int( float64 STATUS_PARAM );
284float64 float64_trunc_to_int( float64 STATUS_PARAM );
285float64 float64_add( float64, float64 STATUS_PARAM );
286float64 float64_sub( float64, float64 STATUS_PARAM );
287float64 float64_mul( float64, float64 STATUS_PARAM );
288float64 float64_div( float64, float64 STATUS_PARAM );
289float64 float64_rem( float64, float64 STATUS_PARAM );
290float64 float64_sqrt( float64 STATUS_PARAM );
291int float64_eq( float64, float64 STATUS_PARAM );
292int float64_le( float64, float64 STATUS_PARAM );
293int float64_lt( float64, float64 STATUS_PARAM );
294int float64_eq_signaling( float64, float64 STATUS_PARAM );
295int float64_le_quiet( float64, float64 STATUS_PARAM );
296int float64_lt_quiet( float64, float64 STATUS_PARAM );
297int float64_compare( float64, float64 STATUS_PARAM );
298int float64_compare_quiet( float64, float64 STATUS_PARAM );
299int float64_is_signaling_nan( float64 );
300
301INLINE float64 float64_abs(float64 a)
302{
303 return a & 0x7fffffffffffffffLL;
304}
305
306INLINE float64 float64_chs(float64 a)
307{
308 return a ^ 0x8000000000000000LL;
309}
310
311#ifdef FLOATX80
312
313/*----------------------------------------------------------------------------
314| Software IEC/IEEE extended double-precision conversion routines.
315*----------------------------------------------------------------------------*/
316int floatx80_to_int32( floatx80 STATUS_PARAM );
317int floatx80_to_int32_round_to_zero( floatx80 STATUS_PARAM );
318int64_t floatx80_to_int64( floatx80 STATUS_PARAM );
319int64_t floatx80_to_int64_round_to_zero( floatx80 STATUS_PARAM );
320float32 floatx80_to_float32( floatx80 STATUS_PARAM );
321float64 floatx80_to_float64( floatx80 STATUS_PARAM );
322#ifdef FLOAT128
323float128 floatx80_to_float128( floatx80 STATUS_PARAM );
324#endif
325
326/*----------------------------------------------------------------------------
327| Software IEC/IEEE extended double-precision operations.
328*----------------------------------------------------------------------------*/
329floatx80 floatx80_round_to_int( floatx80 STATUS_PARAM );
330floatx80 floatx80_add( floatx80, floatx80 STATUS_PARAM );
331floatx80 floatx80_sub( floatx80, floatx80 STATUS_PARAM );
332floatx80 floatx80_mul( floatx80, floatx80 STATUS_PARAM );
333floatx80 floatx80_div( floatx80, floatx80 STATUS_PARAM );
334floatx80 floatx80_rem( floatx80, floatx80 STATUS_PARAM );
335floatx80 floatx80_sqrt( floatx80 STATUS_PARAM );
336int floatx80_eq( floatx80, floatx80 STATUS_PARAM );
337int floatx80_le( floatx80, floatx80 STATUS_PARAM );
338int floatx80_lt( floatx80, floatx80 STATUS_PARAM );
339int floatx80_eq_signaling( floatx80, floatx80 STATUS_PARAM );
340int floatx80_le_quiet( floatx80, floatx80 STATUS_PARAM );
341int floatx80_lt_quiet( floatx80, floatx80 STATUS_PARAM );
342int floatx80_is_signaling_nan( floatx80 );
343
344INLINE floatx80 floatx80_abs(floatx80 a)
345{
346 a.high &= 0x7fff;
347 return a;
348}
349
350INLINE floatx80 floatx80_chs(floatx80 a)
351{
352 a.high ^= 0x8000;
353 return a;
354}
355
356#endif
357
358#ifdef FLOAT128
359
360/*----------------------------------------------------------------------------
361| Software IEC/IEEE quadruple-precision conversion routines.
362*----------------------------------------------------------------------------*/
363int float128_to_int32( float128 STATUS_PARAM );
364int float128_to_int32_round_to_zero( float128 STATUS_PARAM );
365int64_t float128_to_int64( float128 STATUS_PARAM );
366int64_t float128_to_int64_round_to_zero( float128 STATUS_PARAM );
367float32 float128_to_float32( float128 STATUS_PARAM );
368float64 float128_to_float64( float128 STATUS_PARAM );
369#ifdef FLOATX80
370floatx80 float128_to_floatx80( float128 STATUS_PARAM );
371#endif
372
373/*----------------------------------------------------------------------------
374| Software IEC/IEEE quadruple-precision operations.
375*----------------------------------------------------------------------------*/
376float128 float128_round_to_int( float128 STATUS_PARAM );
377float128 float128_add( float128, float128 STATUS_PARAM );
378float128 float128_sub( float128, float128 STATUS_PARAM );
379float128 float128_mul( float128, float128 STATUS_PARAM );
380float128 float128_div( float128, float128 STATUS_PARAM );
381float128 float128_rem( float128, float128 STATUS_PARAM );
382float128 float128_sqrt( float128 STATUS_PARAM );
383int float128_eq( float128, float128 STATUS_PARAM );
384int float128_le( float128, float128 STATUS_PARAM );
385int float128_lt( float128, float128 STATUS_PARAM );
386int float128_eq_signaling( float128, float128 STATUS_PARAM );
387int float128_le_quiet( float128, float128 STATUS_PARAM );
388int float128_lt_quiet( float128, float128 STATUS_PARAM );
389int float128_is_signaling_nan( float128 );
390
391INLINE float128 float128_abs(float128 a)
392{
393 a.high &= 0x7fffffffffffffffLL;
394 return a;
395}
396
397INLINE float128 float128_chs(float128 a)
398{
399 a.high ^= 0x8000000000000000LL;
400 return a;
401}
402
403#endif
404
405#else /* CONFIG_SOFTFLOAT */
406
407#include "softfloat-native.h"
408
409#endif /* !CONFIG_SOFTFLOAT */
410
411#endif /* !SOFTFLOAT_H */
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