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1/*
2 * MIPS floating point support
3 * Copyright (C) 1994-2000 Algorithmics Ltd.
4 *
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 * Nov 7, 2000
19 * Modification to allow integration with Linux kernel
20 *
21 * Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
22 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
23 */
24#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
25#define __ARCH_MIPS_MATH_EMU_IEEE754_H
26
27#include <asm/byteorder.h>
28#include <linux/types.h>
29#include <linux/sched.h>
30
31/*
32 * Not very pretty, but the Linux kernel's normal va_list definition
33 * does not allow it to be used as a structure element, as it is here.
34 */
35#ifndef _STDARG_H
36#include <stdarg.h>
37#endif
38
39#ifdef __LITTLE_ENDIAN
40struct ieee754dp_konst {
41 unsigned mantlo:32;
42 unsigned manthi:20;
43 unsigned bexp:11;
44 unsigned sign:1;
45};
46struct ieee754sp_konst {
47 unsigned mant:23;
48 unsigned bexp:8;
49 unsigned sign:1;
50};
51
52typedef union _ieee754dp {
53 struct ieee754dp_konst oparts;
54 struct {
55 u64 mant:52;
56 unsigned int bexp:11;
57 unsigned int sign:1;
58 } parts;
59 u64 bits;
60 double d;
61} ieee754dp;
62
63typedef union _ieee754sp {
64 struct ieee754sp_konst parts;
65 float f;
66 u32 bits;
67} ieee754sp;
68#endif
69
70#ifdef __BIG_ENDIAN
71struct ieee754dp_konst {
72 unsigned sign:1;
73 unsigned bexp:11;
74 unsigned manthi:20;
75 unsigned mantlo:32;
76};
77
78typedef union _ieee754dp {
79 struct ieee754dp_konst oparts;
80 struct {
81 unsigned int sign:1;
82 unsigned int bexp:11;
83 u64 mant:52;
84 } parts;
85 double d;
86 u64 bits;
87} ieee754dp;
88
89struct ieee754sp_konst {
90 unsigned sign:1;
91 unsigned bexp:8;
92 unsigned mant:23;
93};
94
95typedef union _ieee754sp {
96 struct ieee754sp_konst parts;
97 float f;
98 u32 bits;
99} ieee754sp;
100#endif
101
102/*
103 * single precision (often aka float)
104*/
105int ieee754sp_finite(ieee754sp x);
106int ieee754sp_class(ieee754sp x);
107
108ieee754sp ieee754sp_abs(ieee754sp x);
109ieee754sp ieee754sp_neg(ieee754sp x);
110ieee754sp ieee754sp_scalb(ieee754sp x, int);
111ieee754sp ieee754sp_logb(ieee754sp x);
112
113/* x with sign of y */
114ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y);
115
116ieee754sp ieee754sp_add(ieee754sp x, ieee754sp y);
117ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y);
118ieee754sp ieee754sp_mul(ieee754sp x, ieee754sp y);
119ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y);
120
121ieee754sp ieee754sp_fint(int x);
122ieee754sp ieee754sp_funs(unsigned x);
123ieee754sp ieee754sp_flong(s64 x);
124ieee754sp ieee754sp_fulong(u64 x);
125ieee754sp ieee754sp_fdp(ieee754dp x);
126
127int ieee754sp_tint(ieee754sp x);
128unsigned int ieee754sp_tuns(ieee754sp x);
129s64 ieee754sp_tlong(ieee754sp x);
130u64 ieee754sp_tulong(ieee754sp x);
131
132int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop, int sig);
133/*
134 * basic sp math
135 */
136ieee754sp ieee754sp_modf(ieee754sp x, ieee754sp * ip);
137ieee754sp ieee754sp_frexp(ieee754sp x, int *exp);
138ieee754sp ieee754sp_ldexp(ieee754sp x, int exp);
139
140ieee754sp ieee754sp_ceil(ieee754sp x);
141ieee754sp ieee754sp_floor(ieee754sp x);
142ieee754sp ieee754sp_trunc(ieee754sp x);
143
144ieee754sp ieee754sp_sqrt(ieee754sp x);
145
146/*
147 * double precision (often aka double)
148*/
149int ieee754dp_finite(ieee754dp x);
150int ieee754dp_class(ieee754dp x);
151
152/* x with sign of y */
153ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y);
154
155ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y);
156ieee754dp ieee754dp_sub(ieee754dp x, ieee754dp y);
157ieee754dp ieee754dp_mul(ieee754dp x, ieee754dp y);
158ieee754dp ieee754dp_div(ieee754dp x, ieee754dp y);
159
160ieee754dp ieee754dp_abs(ieee754dp x);
161ieee754dp ieee754dp_neg(ieee754dp x);
162ieee754dp ieee754dp_scalb(ieee754dp x, int);
163
164/* return exponent as integer in floating point format
165 */
166ieee754dp ieee754dp_logb(ieee754dp x);
167
168ieee754dp ieee754dp_fint(int x);
169ieee754dp ieee754dp_funs(unsigned x);
170ieee754dp ieee754dp_flong(s64 x);
171ieee754dp ieee754dp_fulong(u64 x);
172ieee754dp ieee754dp_fsp(ieee754sp x);
173
174ieee754dp ieee754dp_ceil(ieee754dp x);
175ieee754dp ieee754dp_floor(ieee754dp x);
176ieee754dp ieee754dp_trunc(ieee754dp x);
177
178int ieee754dp_tint(ieee754dp x);
179unsigned int ieee754dp_tuns(ieee754dp x);
180s64 ieee754dp_tlong(ieee754dp x);
181u64 ieee754dp_tulong(ieee754dp x);
182
183int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop, int sig);
184/*
185 * basic sp math
186 */
187ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip);
188ieee754dp ieee754dp_frexp(ieee754dp x, int *exp);
189ieee754dp ieee754dp_ldexp(ieee754dp x, int exp);
190
191ieee754dp ieee754dp_ceil(ieee754dp x);
192ieee754dp ieee754dp_floor(ieee754dp x);
193ieee754dp ieee754dp_trunc(ieee754dp x);
194
195ieee754dp ieee754dp_sqrt(ieee754dp x);
196
197
198
199/* 5 types of floating point number
200*/
201#define IEEE754_CLASS_NORM 0x00
202#define IEEE754_CLASS_ZERO 0x01
203#define IEEE754_CLASS_DNORM 0x02
204#define IEEE754_CLASS_INF 0x03
205#define IEEE754_CLASS_SNAN 0x04
206#define IEEE754_CLASS_QNAN 0x05
207
208/* exception numbers */
209#define IEEE754_INEXACT 0x01
210#define IEEE754_UNDERFLOW 0x02
211#define IEEE754_OVERFLOW 0x04
212#define IEEE754_ZERO_DIVIDE 0x08
213#define IEEE754_INVALID_OPERATION 0x10
214
215/* cmp operators
216*/
217#define IEEE754_CLT 0x01
218#define IEEE754_CEQ 0x02
219#define IEEE754_CGT 0x04
220#define IEEE754_CUN 0x08
221
222/* rounding mode
223*/
224#define IEEE754_RN 0 /* round to nearest */
225#define IEEE754_RZ 1 /* round toward zero */
226#define IEEE754_RD 2 /* round toward -Infinity */
227#define IEEE754_RU 3 /* round toward +Infinity */
228
229/* other naming */
230#define IEEE754_RM IEEE754_RD
231#define IEEE754_RP IEEE754_RU
232
233/* "normal" comparisons
234*/
235static inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
236{
237 return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
238}
239
240static inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
241{
242 return ieee754sp_cmp(x, y,
243 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
244}
245
246static inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
247{
248 return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
249}
250
251static inline int ieee754sp_le(ieee754sp x, ieee754sp y)
252{
253 return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
254}
255
256static inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
257{
258 return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
259}
260
261
262static inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
263{
264 return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
265}
266
267static inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
268{
269 return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
270}
271
272static inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
273{
274 return ieee754dp_cmp(x, y,
275 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
276}
277
278static inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
279{
280 return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
281}
282
283static inline int ieee754dp_le(ieee754dp x, ieee754dp y)
284{
285 return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
286}
287
288static inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
289{
290 return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
291}
292
293static inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
294{
295 return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
296}
297
298
299/*
300 * Like strtod
301 */
302ieee754dp ieee754dp_fstr(const char *s, char **endp);
303char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
304
305
306/*
307 * The control status register
308 */
309struct _ieee754_csr {
310#ifdef __BIG_ENDIAN
311 unsigned pad0:7;
312 unsigned nod:1; /* set 1 for no denormalised numbers */
313 unsigned c:1; /* condition */
314 unsigned pad1:5;
315 unsigned cx:6; /* exceptions this operation */
316 unsigned mx:5; /* exception enable mask */
317 unsigned sx:5; /* exceptions total */
318 unsigned rm:2; /* current rounding mode */
319#endif
320#ifdef __LITTLE_ENDIAN
321 unsigned rm:2; /* current rounding mode */
322 unsigned sx:5; /* exceptions total */
323 unsigned mx:5; /* exception enable mask */
324 unsigned cx:6; /* exceptions this operation */
325 unsigned pad1:5;
326 unsigned c:1; /* condition */
327 unsigned nod:1; /* set 1 for no denormalised numbers */
328 unsigned pad0:7;
329#endif
330};
331#define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
332
333static inline unsigned ieee754_getrm(void)
334{
335 return (ieee754_csr.rm);
336}
337static inline unsigned ieee754_setrm(unsigned rm)
338{
339 return (ieee754_csr.rm = rm);
340}
341
342/*
343 * get current exceptions
344 */
345static inline unsigned ieee754_getcx(void)
346{
347 return (ieee754_csr.cx);
348}
349
350/* test for current exception condition
351 */
352static inline int ieee754_cxtest(unsigned n)
353{
354 return (ieee754_csr.cx & n);
355}
356
357/*
358 * get sticky exceptions
359 */
360static inline unsigned ieee754_getsx(void)
361{
362 return (ieee754_csr.sx);
363}
364
365/* clear sticky conditions
366*/
367static inline unsigned ieee754_clrsx(void)
368{
369 return (ieee754_csr.sx = 0);
370}
371
372/* test for sticky exception condition
373 */
374static inline int ieee754_sxtest(unsigned n)
375{
376 return (ieee754_csr.sx & n);
377}
378
379/* debugging */
380ieee754sp ieee754sp_dump(char *s, ieee754sp x);
381ieee754dp ieee754dp_dump(char *s, ieee754dp x);
382
383#define IEEE754_SPCVAL_PZERO 0
384#define IEEE754_SPCVAL_NZERO 1
385#define IEEE754_SPCVAL_PONE 2
386#define IEEE754_SPCVAL_NONE 3
387#define IEEE754_SPCVAL_PTEN 4
388#define IEEE754_SPCVAL_NTEN 5
389#define IEEE754_SPCVAL_PINFINITY 6
390#define IEEE754_SPCVAL_NINFINITY 7
391#define IEEE754_SPCVAL_INDEF 8
392#define IEEE754_SPCVAL_PMAX 9 /* +max norm */
393#define IEEE754_SPCVAL_NMAX 10 /* -max norm */
394#define IEEE754_SPCVAL_PMIN 11 /* +min norm */
395#define IEEE754_SPCVAL_NMIN 12 /* +min norm */
396#define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
397#define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
398#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
399#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
400
401extern const struct ieee754dp_konst __ieee754dp_spcvals[];
402extern const struct ieee754sp_konst __ieee754sp_spcvals[];
403#define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
404#define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
405
406/*
407 * Return infinity with given sign
408 */
409#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
410#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
411#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
412#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
413#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
414#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
415#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
416#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
417#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
418#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
419
420#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
421#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
422#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
423#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
424#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
425#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
426#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
427#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
428#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
429#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
430
431/*
432 * Indefinite integer value
433 */
434#define ieee754si_indef() INT_MAX
435#ifdef LONG_LONG_MAX
436#define ieee754di_indef() LONG_LONG_MAX
437#else
438#define ieee754di_indef() ((s64)(~0ULL>>1))
439#endif
440
441/* IEEE exception context, passed to handler */
442struct ieee754xctx {
443 const char *op; /* operation name */
444 int rt; /* result type */
445 union {
446 ieee754sp sp; /* single precision */
447 ieee754dp dp; /* double precision */
448#ifdef IEEE854_XP
449 ieee754xp xp; /* extended precision */
450#endif
451 int si; /* standard signed integer (32bits) */
452 s64 di; /* extended signed integer (64bits) */
453 } rv; /* default result format implied by op */
454 va_list ap;
455};
456
457/* result types for xctx.rt */
458#define IEEE754_RT_SP 0
459#define IEEE754_RT_DP 1
460#define IEEE754_RT_XP 2
461#define IEEE754_RT_SI 3
462#define IEEE754_RT_DI 4
463
464extern void ieee754_xcpt(struct ieee754xctx *xcp);
465
466/* compat */
467#define ieee754dp_fix(x) ieee754dp_tint(x)
468#define ieee754sp_fix(x) ieee754sp_tint(x)
469
470#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * MIPS floating point support
4 * Copyright (C) 1994-2000 Algorithmics Ltd.
5 *
6 * Nov 7, 2000
7 * Modification to allow integration with Linux kernel
8 *
9 * Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
10 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
11 */
12#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
13#define __ARCH_MIPS_MATH_EMU_IEEE754_H
14
15#include <linux/compiler.h>
16#include <asm/byteorder.h>
17#include <linux/kernel.h>
18#include <linux/types.h>
19#include <linux/sched.h>
20#include <asm/bitfield.h>
21
22union ieee754dp {
23 struct {
24 __BITFIELD_FIELD(unsigned int sign:1,
25 __BITFIELD_FIELD(unsigned int bexp:11,
26 __BITFIELD_FIELD(u64 mant:52,
27 ;)))
28 };
29 u64 bits;
30};
31
32union ieee754sp {
33 struct {
34 __BITFIELD_FIELD(unsigned sign:1,
35 __BITFIELD_FIELD(unsigned bexp:8,
36 __BITFIELD_FIELD(unsigned mant:23,
37 ;)))
38 };
39 u32 bits;
40};
41
42/*
43 * single precision (often aka float)
44*/
45int ieee754sp_class(union ieee754sp x);
46
47union ieee754sp ieee754sp_abs(union ieee754sp x);
48union ieee754sp ieee754sp_neg(union ieee754sp x);
49
50union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y);
51union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y);
52union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y);
53union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y);
54
55union ieee754sp ieee754sp_fint(int x);
56union ieee754sp ieee754sp_flong(s64 x);
57union ieee754sp ieee754sp_fdp(union ieee754dp x);
58union ieee754sp ieee754sp_rint(union ieee754sp x);
59
60int ieee754sp_tint(union ieee754sp x);
61s64 ieee754sp_tlong(union ieee754sp x);
62
63int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig);
64
65union ieee754sp ieee754sp_sqrt(union ieee754sp x);
66
67union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x,
68 union ieee754sp y);
69union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x,
70 union ieee754sp y);
71union ieee754sp ieee754sp_madd(union ieee754sp z, union ieee754sp x,
72 union ieee754sp y);
73union ieee754sp ieee754sp_msub(union ieee754sp z, union ieee754sp x,
74 union ieee754sp y);
75union ieee754sp ieee754sp_nmadd(union ieee754sp z, union ieee754sp x,
76 union ieee754sp y);
77union ieee754sp ieee754sp_nmsub(union ieee754sp z, union ieee754sp x,
78 union ieee754sp y);
79int ieee754sp_2008class(union ieee754sp x);
80union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y);
81union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y);
82union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y);
83union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y);
84
85/*
86 * double precision (often aka double)
87*/
88int ieee754dp_class(union ieee754dp x);
89
90union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
91union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
92union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
93union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
94
95union ieee754dp ieee754dp_abs(union ieee754dp x);
96union ieee754dp ieee754dp_neg(union ieee754dp x);
97
98union ieee754dp ieee754dp_fint(int x);
99union ieee754dp ieee754dp_flong(s64 x);
100union ieee754dp ieee754dp_fsp(union ieee754sp x);
101union ieee754dp ieee754dp_rint(union ieee754dp x);
102
103int ieee754dp_tint(union ieee754dp x);
104s64 ieee754dp_tlong(union ieee754dp x);
105
106int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
107
108union ieee754dp ieee754dp_sqrt(union ieee754dp x);
109
110union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x,
111 union ieee754dp y);
112union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x,
113 union ieee754dp y);
114union ieee754dp ieee754dp_madd(union ieee754dp z, union ieee754dp x,
115 union ieee754dp y);
116union ieee754dp ieee754dp_msub(union ieee754dp z, union ieee754dp x,
117 union ieee754dp y);
118union ieee754dp ieee754dp_nmadd(union ieee754dp z, union ieee754dp x,
119 union ieee754dp y);
120union ieee754dp ieee754dp_nmsub(union ieee754dp z, union ieee754dp x,
121 union ieee754dp y);
122int ieee754dp_2008class(union ieee754dp x);
123union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y);
124union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y);
125union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y);
126union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y);
127
128
129/* 5 types of floating point number
130*/
131enum {
132 IEEE754_CLASS_NORM = 0x00,
133 IEEE754_CLASS_ZERO = 0x01,
134 IEEE754_CLASS_DNORM = 0x02,
135 IEEE754_CLASS_INF = 0x03,
136 IEEE754_CLASS_SNAN = 0x04,
137 IEEE754_CLASS_QNAN = 0x05,
138};
139
140/* exception numbers */
141#define IEEE754_INEXACT 0x01
142#define IEEE754_UNDERFLOW 0x02
143#define IEEE754_OVERFLOW 0x04
144#define IEEE754_ZERO_DIVIDE 0x08
145#define IEEE754_INVALID_OPERATION 0x10
146
147/* cmp operators
148*/
149#define IEEE754_CLT 0x01
150#define IEEE754_CEQ 0x02
151#define IEEE754_CGT 0x04
152#define IEEE754_CUN 0x08
153
154/*
155 * The control status register
156 */
157struct _ieee754_csr {
158 __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */
159 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */
160 __BITFIELD_FIELD(unsigned c:1, /* condition[0] */
161 __BITFIELD_FIELD(unsigned pad0:3,
162 __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */
163 __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */
164 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
165 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
166 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
167 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
168 ;))))))))))
169};
170#define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
171
172static inline unsigned int ieee754_getrm(void)
173{
174 return (ieee754_csr.rm);
175}
176
177static inline unsigned int ieee754_setrm(unsigned int rm)
178{
179 return (ieee754_csr.rm = rm);
180}
181
182/*
183 * get current exceptions
184 */
185static inline unsigned int ieee754_getcx(void)
186{
187 return (ieee754_csr.cx);
188}
189
190/* test for current exception condition
191 */
192static inline int ieee754_cxtest(unsigned int n)
193{
194 return (ieee754_csr.cx & n);
195}
196
197/*
198 * get sticky exceptions
199 */
200static inline unsigned int ieee754_getsx(void)
201{
202 return (ieee754_csr.sx);
203}
204
205/* clear sticky conditions
206*/
207static inline unsigned int ieee754_clrsx(void)
208{
209 return (ieee754_csr.sx = 0);
210}
211
212/* test for sticky exception condition
213 */
214static inline int ieee754_sxtest(unsigned int n)
215{
216 return (ieee754_csr.sx & n);
217}
218
219/* debugging */
220union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
221union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
222
223#define IEEE754_SPCVAL_PZERO 0 /* +0.0 */
224#define IEEE754_SPCVAL_NZERO 1 /* -0.0 */
225#define IEEE754_SPCVAL_PONE 2 /* +1.0 */
226#define IEEE754_SPCVAL_NONE 3 /* -1.0 */
227#define IEEE754_SPCVAL_PTEN 4 /* +10.0 */
228#define IEEE754_SPCVAL_NTEN 5 /* -10.0 */
229#define IEEE754_SPCVAL_PINFINITY 6 /* +inf */
230#define IEEE754_SPCVAL_NINFINITY 7 /* -inf */
231#define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */
232#define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */
233#define IEEE754_SPCVAL_PMAX 10 /* +max norm */
234#define IEEE754_SPCVAL_NMAX 11 /* -max norm */
235#define IEEE754_SPCVAL_PMIN 12 /* +min norm */
236#define IEEE754_SPCVAL_NMIN 13 /* -min norm */
237#define IEEE754_SPCVAL_PMIND 14 /* +min denorm */
238#define IEEE754_SPCVAL_NMIND 15 /* -min denorm */
239#define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */
240#define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */
241
242extern const union ieee754dp __ieee754dp_spcvals[];
243extern const union ieee754sp __ieee754sp_spcvals[];
244#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
245#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
246
247/*
248 * Return infinity with given sign
249 */
250#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
251#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
252#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
253#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
254#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \
255 ieee754_csr.nan2008])
256#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
257#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
258#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
259#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
260#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
261
262#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
263#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
264#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
265#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
266#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \
267 ieee754_csr.nan2008])
268#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
269#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
270#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
271#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
272#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
273
274/*
275 * Indefinite integer value
276 */
277static inline int ieee754si_indef(void)
278{
279 return ieee754_csr.nan2008 ? 0 : INT_MAX;
280}
281
282static inline s64 ieee754di_indef(void)
283{
284 return ieee754_csr.nan2008 ? 0 : S64_MAX;
285}
286
287/*
288 * Overflow integer value
289 */
290static inline int ieee754si_overflow(int xs)
291{
292 return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX;
293}
294
295static inline s64 ieee754di_overflow(int xs)
296{
297 return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX;
298}
299
300/* result types for xctx.rt */
301#define IEEE754_RT_SP 0
302#define IEEE754_RT_DP 1
303#define IEEE754_RT_XP 2
304#define IEEE754_RT_SI 3
305#define IEEE754_RT_DI 4
306
307/* compat */
308#define ieee754dp_fix(x) ieee754dp_tint(x)
309#define ieee754sp_fix(x) ieee754sp_tint(x)
310
311#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */