VirtualBox

source: vbox/trunk/src/recompiler/fpu/softfloat-native.c@ 2742

最後變更 在這個檔案從2742是 1,由 vboxsync 提交於 55 年 前

import

檔案大小: 8.3 KB
 
1/* Native implementation of soft float functions. Only a single status
2 context is supported */
3#include "softfloat.h"
4#include <math.h>
5
6void set_float_rounding_mode(int val STATUS_PARAM)
7{
8 STATUS(float_rounding_mode) = val;
9#if defined(_BSD) && !defined(__APPLE__) || (defined(HOST_SOLARIS) && HOST_SOLARIS < 10)
10 fpsetround(val);
11#elif defined(__arm__)
12 /* nothing to do */
13#else
14 fesetround(val);
15#endif
16}
17
18#ifdef FLOATX80
19void set_floatx80_rounding_precision(int val STATUS_PARAM)
20{
21 STATUS(floatx80_rounding_precision) = val;
22}
23#endif
24
25#if defined(_BSD) || (defined(HOST_SOLARIS) && HOST_SOLARIS < 10)
26#define lrint(d) ((int32_t)rint(d))
27#define llrint(d) ((int64_t)rint(d))
28#define lrintf(f) ((int32_t)rint(f))
29#define llrintf(f) ((int64_t)rint(f))
30#define sqrtf(f) ((float)sqrt(f))
31#define remainderf(fa, fb) ((float)remainder(fa, fb))
32#define rintf(f) ((float)rint(f))
33#endif
34
35#if defined(__powerpc__)
36
37/* correct (but slow) PowerPC rint() (glibc version is incorrect) */
38double qemu_rint(double x)
39{
40 double y = 4503599627370496.0;
41 if (fabs(x) >= y)
42 return x;
43 if (x < 0)
44 y = -y;
45 y = (x + y) - y;
46 if (y == 0.0)
47 y = copysign(y, x);
48 return y;
49}
50
51#define rint qemu_rint
52#endif
53
54/*----------------------------------------------------------------------------
55| Software IEC/IEEE integer-to-floating-point conversion routines.
56*----------------------------------------------------------------------------*/
57float32 int32_to_float32(int v STATUS_PARAM)
58{
59 return (float32)v;
60}
61
62float64 int32_to_float64(int v STATUS_PARAM)
63{
64 return (float64)v;
65}
66
67#ifdef FLOATX80
68floatx80 int32_to_floatx80(int v STATUS_PARAM)
69{
70 return (floatx80)v;
71}
72#endif
73float32 int64_to_float32( int64_t v STATUS_PARAM)
74{
75 return (float32)v;
76}
77float64 int64_to_float64( int64_t v STATUS_PARAM)
78{
79 return (float64)v;
80}
81#ifdef FLOATX80
82floatx80 int64_to_floatx80( int64_t v STATUS_PARAM)
83{
84 return (floatx80)v;
85}
86#endif
87
88/* XXX: this code implements the x86 behaviour, not the IEEE one. */
89#if HOST_LONG_BITS == 32
90static inline int long_to_int32(long a)
91{
92 return a;
93}
94#else
95static inline int long_to_int32(long a)
96{
97 if (a != (int32_t)a)
98 a = 0x80000000;
99 return a;
100}
101#endif
102
103/*----------------------------------------------------------------------------
104| Software IEC/IEEE single-precision conversion routines.
105*----------------------------------------------------------------------------*/
106int float32_to_int32( float32 a STATUS_PARAM)
107{
108 return long_to_int32(lrintf(a));
109}
110int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
111{
112 return (int)a;
113}
114int64_t float32_to_int64( float32 a STATUS_PARAM)
115{
116 return llrintf(a);
117}
118
119int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM)
120{
121 return (int64_t)a;
122}
123
124float64 float32_to_float64( float32 a STATUS_PARAM)
125{
126 return a;
127}
128#ifdef FLOATX80
129floatx80 float32_to_floatx80( float32 a STATUS_PARAM)
130{
131 return a;
132}
133#endif
134
135/*----------------------------------------------------------------------------
136| Software IEC/IEEE single-precision operations.
137*----------------------------------------------------------------------------*/
138float32 float32_round_to_int( float32 a STATUS_PARAM)
139{
140 return rintf(a);
141}
142
143float32 float32_rem( float32 a, float32 b STATUS_PARAM)
144{
145 return remainderf(a, b);
146}
147
148float32 float32_sqrt( float32 a STATUS_PARAM)
149{
150 return sqrtf(a);
151}
152int float32_compare( float32 a, float32 b STATUS_PARAM )
153{
154 if (a < b) {
155 return -1;
156 } else if (a == b) {
157 return 0;
158 } else if (a > b) {
159 return 1;
160 } else {
161 return 2;
162 }
163}
164int float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
165{
166 if (isless(a, b)) {
167 return -1;
168 } else if (a == b) {
169 return 0;
170 } else if (isgreater(a, b)) {
171 return 1;
172 } else {
173 return 2;
174 }
175}
176int float32_is_signaling_nan( float32 a1)
177{
178 float32u u;
179 uint32_t a;
180 u.f = a1;
181 a = u.i;
182 return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
183}
184
185/*----------------------------------------------------------------------------
186| Software IEC/IEEE double-precision conversion routines.
187*----------------------------------------------------------------------------*/
188int float64_to_int32( float64 a STATUS_PARAM)
189{
190 return long_to_int32(lrint(a));
191}
192int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
193{
194 return (int)a;
195}
196int64_t float64_to_int64( float64 a STATUS_PARAM)
197{
198 return llrint(a);
199}
200int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM)
201{
202 return (int64_t)a;
203}
204float32 float64_to_float32( float64 a STATUS_PARAM)
205{
206 return a;
207}
208#ifdef FLOATX80
209floatx80 float64_to_floatx80( float64 a STATUS_PARAM)
210{
211 return a;
212}
213#endif
214#ifdef FLOAT128
215float128 float64_to_float128( float64 a STATUS_PARAM)
216{
217 return a;
218}
219#endif
220
221/*----------------------------------------------------------------------------
222| Software IEC/IEEE double-precision operations.
223*----------------------------------------------------------------------------*/
224float64 float64_trunc_to_int( float64 a STATUS_PARAM )
225{
226 return trunc(a);
227}
228
229float64 float64_round_to_int( float64 a STATUS_PARAM )
230{
231#if defined(__arm__)
232 switch(STATUS(float_rounding_mode)) {
233 default:
234 case float_round_nearest_even:
235 asm("rndd %0, %1" : "=f" (a) : "f"(a));
236 break;
237 case float_round_down:
238 asm("rnddm %0, %1" : "=f" (a) : "f"(a));
239 break;
240 case float_round_up:
241 asm("rnddp %0, %1" : "=f" (a) : "f"(a));
242 break;
243 case float_round_to_zero:
244 asm("rnddz %0, %1" : "=f" (a) : "f"(a));
245 break;
246 }
247#else
248 return rint(a);
249#endif
250}
251
252float64 float64_rem( float64 a, float64 b STATUS_PARAM)
253{
254 return remainder(a, b);
255}
256
257float64 float64_sqrt( float64 a STATUS_PARAM)
258{
259 return sqrt(a);
260}
261int float64_compare( float64 a, float64 b STATUS_PARAM )
262{
263 if (a < b) {
264 return -1;
265 } else if (a == b) {
266 return 0;
267 } else if (a > b) {
268 return 1;
269 } else {
270 return 2;
271 }
272}
273int float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
274{
275 if (isless(a, b)) {
276 return -1;
277 } else if (a == b) {
278 return 0;
279 } else if (isgreater(a, b)) {
280 return 1;
281 } else {
282 return 2;
283 }
284}
285int float64_is_signaling_nan( float64 a1)
286{
287 float64u u;
288 uint64_t a;
289 u.f = a1;
290 a = u.i;
291 return
292 ( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
293 && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
294
295}
296
297int float64_is_nan( float64 a1 )
298{
299 float64u u;
300 uint64_t a;
301 u.f = a1;
302 a = u.i;
303
304 return ( LIT64( 0xFFE0000000000000 ) < (bits64) ( a<<1 ) );
305
306}
307
308#ifdef FLOATX80
309
310/*----------------------------------------------------------------------------
311| Software IEC/IEEE extended double-precision conversion routines.
312*----------------------------------------------------------------------------*/
313int floatx80_to_int32( floatx80 a STATUS_PARAM)
314{
315 return long_to_int32(lrintl(a));
316}
317int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
318{
319 return (int)a;
320}
321int64_t floatx80_to_int64( floatx80 a STATUS_PARAM)
322{
323 return llrintl(a);
324}
325int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM)
326{
327 return (int64_t)a;
328}
329float32 floatx80_to_float32( floatx80 a STATUS_PARAM)
330{
331 return a;
332}
333float64 floatx80_to_float64( floatx80 a STATUS_PARAM)
334{
335 return a;
336}
337
338/*----------------------------------------------------------------------------
339| Software IEC/IEEE extended double-precision operations.
340*----------------------------------------------------------------------------*/
341floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM)
342{
343 return rintl(a);
344}
345floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM)
346{
347 return remainderl(a, b);
348}
349floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM)
350{
351 return sqrtl(a);
352}
353int floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
354{
355 if (a < b) {
356 return -1;
357 } else if (a == b) {
358 return 0;
359 } else if (a > b) {
360 return 1;
361 } else {
362 return 2;
363 }
364}
365int floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
366{
367 if (isless(a, b)) {
368 return -1;
369 } else if (a == b) {
370 return 0;
371 } else if (isgreater(a, b)) {
372 return 1;
373 } else {
374 return 2;
375 }
376}
377int floatx80_is_signaling_nan( floatx80 a1)
378{
379 floatx80u u;
380 u.f = a1;
381 return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 );
382}
383
384#endif
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette