2 * MIPS floating point support
3 * Copyright (C) 1994-2000 Algorithmics Ltd.
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.
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
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.
19 * Modification to allow integration with Linux kernel
21 * Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
22 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
24 #ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
25 #define __ARCH_MIPS_MATH_EMU_IEEE754_H
27 #include <linux/compiler.h>
28 #include <asm/byteorder.h>
29 #include <linux/types.h>
30 #include <linux/sched.h>
31 #include <asm/bitfield.h>
34 * Not very pretty, but the Linux kernel's normal va_list definition
35 * does not allow it to be used as a structure element, as it is here.
41 struct ieee754dp_const {
42 __BITFIELD_FIELD(unsigned sign:1,
43 __BITFIELD_FIELD(unsigned bexp:11,
44 __BITFIELD_FIELD(unsigned manthi:20,
45 __BITFIELD_FIELD(unsigned mantlo:32,
50 struct ieee754dp_const oparts;
52 __BITFIELD_FIELD(unsigned int sign:1,
53 __BITFIELD_FIELD(unsigned int bexp:11,
54 __BITFIELD_FIELD(u64 mant:52,
61 struct ieee754sp_const {
62 __BITFIELD_FIELD(unsigned sign:1,
63 __BITFIELD_FIELD(unsigned bexp:8,
64 __BITFIELD_FIELD(unsigned mant:23,
69 struct ieee754sp_const parts;
75 * single precision (often aka float)
77 int ieee754sp_finite(union ieee754sp x);
78 int ieee754sp_class(union ieee754sp x);
80 union ieee754sp ieee754sp_abs(union ieee754sp x);
81 union ieee754sp ieee754sp_neg(union ieee754sp x);
82 union ieee754sp ieee754sp_scalb(union ieee754sp x, int);
83 union ieee754sp ieee754sp_logb(union ieee754sp x);
85 /* x with sign of y */
86 union ieee754sp ieee754sp_copysign(union ieee754sp x, union ieee754sp y);
88 union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y);
89 union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y);
90 union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y);
91 union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y);
93 union ieee754sp ieee754sp_fint(int x);
94 union ieee754sp ieee754sp_funs(unsigned x);
95 union ieee754sp ieee754sp_flong(s64 x);
96 union ieee754sp ieee754sp_fulong(u64 x);
97 union ieee754sp ieee754sp_fdp(union ieee754dp x);
99 int ieee754sp_tint(union ieee754sp x);
100 unsigned int ieee754sp_tuns(union ieee754sp x);
101 s64 ieee754sp_tlong(union ieee754sp x);
102 u64 ieee754sp_tulong(union ieee754sp x);
104 int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig);
108 union ieee754sp ieee754sp_modf(union ieee754sp x, union ieee754sp * ip);
109 union ieee754sp ieee754sp_frexp(union ieee754sp x, int *exp);
110 union ieee754sp ieee754sp_ldexp(union ieee754sp x, int exp);
112 union ieee754sp ieee754sp_ceil(union ieee754sp x);
113 union ieee754sp ieee754sp_floor(union ieee754sp x);
114 union ieee754sp ieee754sp_trunc(union ieee754sp x);
116 union ieee754sp ieee754sp_sqrt(union ieee754sp x);
119 * double precision (often aka double)
121 int ieee754dp_finite(union ieee754dp x);
122 int ieee754dp_class(union ieee754dp x);
124 /* x with sign of y */
125 union ieee754dp ieee754dp_copysign(union ieee754dp x, union ieee754dp y);
127 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
128 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
129 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
130 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
132 union ieee754dp ieee754dp_abs(union ieee754dp x);
133 union ieee754dp ieee754dp_neg(union ieee754dp x);
134 union ieee754dp ieee754dp_scalb(union ieee754dp x, int);
136 /* return exponent as integer in floating point format
138 union ieee754dp ieee754dp_logb(union ieee754dp x);
140 union ieee754dp ieee754dp_fint(int x);
141 union ieee754dp ieee754dp_funs(unsigned x);
142 union ieee754dp ieee754dp_flong(s64 x);
143 union ieee754dp ieee754dp_fulong(u64 x);
144 union ieee754dp ieee754dp_fsp(union ieee754sp x);
146 union ieee754dp ieee754dp_ceil(union ieee754dp x);
147 union ieee754dp ieee754dp_floor(union ieee754dp x);
148 union ieee754dp ieee754dp_trunc(union ieee754dp x);
150 int ieee754dp_tint(union ieee754dp x);
151 unsigned int ieee754dp_tuns(union ieee754dp x);
152 s64 ieee754dp_tlong(union ieee754dp x);
153 u64 ieee754dp_tulong(union ieee754dp x);
155 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
159 union ieee754dp ieee754dp_modf(union ieee754dp x, union ieee754dp * ip);
160 union ieee754dp ieee754dp_frexp(union ieee754dp x, int *exp);
161 union ieee754dp ieee754dp_ldexp(union ieee754dp x, int exp);
163 union ieee754dp ieee754dp_ceil(union ieee754dp x);
164 union ieee754dp ieee754dp_floor(union ieee754dp x);
165 union ieee754dp ieee754dp_trunc(union ieee754dp x);
167 union ieee754dp ieee754dp_sqrt(union ieee754dp x);
171 /* 5 types of floating point number
174 IEEE754_CLASS_NORM = 0x00,
175 IEEE754_CLASS_ZERO = 0x01,
176 IEEE754_CLASS_DNORM = 0x02,
177 IEEE754_CLASS_INF = 0x03,
178 IEEE754_CLASS_SNAN = 0x04,
179 IEEE754_CLASS_QNAN = 0x05,
182 /* exception numbers */
183 #define IEEE754_INEXACT 0x01
184 #define IEEE754_UNDERFLOW 0x02
185 #define IEEE754_OVERFLOW 0x04
186 #define IEEE754_ZERO_DIVIDE 0x08
187 #define IEEE754_INVALID_OPERATION 0x10
191 #define IEEE754_CLT 0x01
192 #define IEEE754_CEQ 0x02
193 #define IEEE754_CGT 0x04
194 #define IEEE754_CUN 0x08
198 #define IEEE754_RN 0 /* round to nearest */
199 #define IEEE754_RZ 1 /* round toward zero */
200 #define IEEE754_RD 2 /* round toward -Infinity */
201 #define IEEE754_RU 3 /* round toward +Infinity */
204 #define IEEE754_RM IEEE754_RD
205 #define IEEE754_RP IEEE754_RU
207 /* "normal" comparisons
209 static inline int ieee754sp_eq(union ieee754sp x, union ieee754sp y)
211 return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
214 static inline int ieee754sp_ne(union ieee754sp x, union ieee754sp y)
216 return ieee754sp_cmp(x, y,
217 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
220 static inline int ieee754sp_lt(union ieee754sp x, union ieee754sp y)
222 return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
225 static inline int ieee754sp_le(union ieee754sp x, union ieee754sp y)
227 return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
230 static inline int ieee754sp_gt(union ieee754sp x, union ieee754sp y)
232 return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
236 static inline int ieee754sp_ge(union ieee754sp x, union ieee754sp y)
238 return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
241 static inline int ieee754dp_eq(union ieee754dp x, union ieee754dp y)
243 return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
246 static inline int ieee754dp_ne(union ieee754dp x, union ieee754dp y)
248 return ieee754dp_cmp(x, y,
249 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
252 static inline int ieee754dp_lt(union ieee754dp x, union ieee754dp y)
254 return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
257 static inline int ieee754dp_le(union ieee754dp x, union ieee754dp y)
259 return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
262 static inline int ieee754dp_gt(union ieee754dp x, union ieee754dp y)
264 return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
267 static inline int ieee754dp_ge(union ieee754dp x, union ieee754dp y)
269 return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
276 union ieee754dp ieee754dp_fstr(const char *s, char **endp);
277 char *ieee754dp_tstr(union ieee754dp x, int prec, int fmt, int af);
281 * The control status register
283 struct _ieee754_csr {
284 __BITFIELD_FIELD(unsigned pad0:7,
285 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormalised numbers */
286 __BITFIELD_FIELD(unsigned c:1, /* condition */
287 __BITFIELD_FIELD(unsigned pad1:5,
288 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
289 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
290 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
291 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
294 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
296 static inline unsigned ieee754_getrm(void)
298 return (ieee754_csr.rm);
300 static inline unsigned ieee754_setrm(unsigned rm)
302 return (ieee754_csr.rm = rm);
306 * get current exceptions
308 static inline unsigned ieee754_getcx(void)
310 return (ieee754_csr.cx);
313 /* test for current exception condition
315 static inline int ieee754_cxtest(unsigned n)
317 return (ieee754_csr.cx & n);
321 * get sticky exceptions
323 static inline unsigned ieee754_getsx(void)
325 return (ieee754_csr.sx);
328 /* clear sticky conditions
330 static inline unsigned ieee754_clrsx(void)
332 return (ieee754_csr.sx = 0);
335 /* test for sticky exception condition
337 static inline int ieee754_sxtest(unsigned n)
339 return (ieee754_csr.sx & n);
343 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
344 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
346 #define IEEE754_SPCVAL_PZERO 0
347 #define IEEE754_SPCVAL_NZERO 1
348 #define IEEE754_SPCVAL_PONE 2
349 #define IEEE754_SPCVAL_NONE 3
350 #define IEEE754_SPCVAL_PTEN 4
351 #define IEEE754_SPCVAL_NTEN 5
352 #define IEEE754_SPCVAL_PINFINITY 6
353 #define IEEE754_SPCVAL_NINFINITY 7
354 #define IEEE754_SPCVAL_INDEF 8
355 #define IEEE754_SPCVAL_PMAX 9 /* +max norm */
356 #define IEEE754_SPCVAL_NMAX 10 /* -max norm */
357 #define IEEE754_SPCVAL_PMIN 11 /* +min norm */
358 #define IEEE754_SPCVAL_NMIN 12 /* +min norm */
359 #define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
360 #define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
361 #define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
362 #define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
364 extern const struct ieee754dp_const __ieee754dp_spcvals[];
365 extern const struct ieee754sp_const __ieee754sp_spcvals[];
366 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
367 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
370 * Return infinity with given sign
372 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
373 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
374 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
375 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
376 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
377 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
378 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
379 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
380 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
381 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
383 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
384 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
385 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
386 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
387 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
388 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
389 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
390 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
391 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
392 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
395 * Indefinite integer value
397 #define ieee754si_indef() INT_MAX
399 #define ieee754di_indef() LONG_LONG_MAX
401 #define ieee754di_indef() ((s64)(~0ULL>>1))
404 /* IEEE exception context, passed to handler */
406 const char *op; /* operation name */
407 int rt; /* result type */
409 union ieee754sp sp; /* single precision */
410 union ieee754dp dp; /* double precision */
411 int si; /* standard signed integer (32bits) */
412 s64 di; /* extended signed integer (64bits) */
413 } rv; /* default result format implied by op */
417 /* result types for xctx.rt */
418 #define IEEE754_RT_SP 0
419 #define IEEE754_RT_DP 1
420 #define IEEE754_RT_XP 2
421 #define IEEE754_RT_SI 3
422 #define IEEE754_RT_DI 4
424 extern void __cold ieee754_xcpt(struct ieee754xctx *xcp);
427 #define ieee754dp_fix(x) ieee754dp_tint(x)
428 #define ieee754sp_fix(x) ieee754sp_tint(x)
430 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */