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,
49 typedef union _ieee754dp {
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,
68 typedef union _ieee754sp {
69 struct ieee754sp_const parts;
75 * single precision (often aka float)
77 int ieee754sp_finite(ieee754sp x);
78 int ieee754sp_class(ieee754sp x);
80 ieee754sp ieee754sp_abs(ieee754sp x);
81 ieee754sp ieee754sp_neg(ieee754sp x);
82 ieee754sp ieee754sp_scalb(ieee754sp x, int);
83 ieee754sp ieee754sp_logb(ieee754sp x);
85 /* x with sign of y */
86 ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y);
88 ieee754sp ieee754sp_add(ieee754sp x, ieee754sp y);
89 ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y);
90 ieee754sp ieee754sp_mul(ieee754sp x, ieee754sp y);
91 ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y);
93 ieee754sp ieee754sp_fint(int x);
94 ieee754sp ieee754sp_funs(unsigned x);
95 ieee754sp ieee754sp_flong(s64 x);
96 ieee754sp ieee754sp_fulong(u64 x);
97 ieee754sp ieee754sp_fdp(ieee754dp x);
99 int ieee754sp_tint(ieee754sp x);
100 unsigned int ieee754sp_tuns(ieee754sp x);
101 s64 ieee754sp_tlong(ieee754sp x);
102 u64 ieee754sp_tulong(ieee754sp x);
104 int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop, int sig);
108 ieee754sp ieee754sp_modf(ieee754sp x, ieee754sp * ip);
109 ieee754sp ieee754sp_frexp(ieee754sp x, int *exp);
110 ieee754sp ieee754sp_ldexp(ieee754sp x, int exp);
112 ieee754sp ieee754sp_ceil(ieee754sp x);
113 ieee754sp ieee754sp_floor(ieee754sp x);
114 ieee754sp ieee754sp_trunc(ieee754sp x);
116 ieee754sp ieee754sp_sqrt(ieee754sp x);
119 * double precision (often aka double)
121 int ieee754dp_finite(ieee754dp x);
122 int ieee754dp_class(ieee754dp x);
124 /* x with sign of y */
125 ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y);
127 ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y);
128 ieee754dp ieee754dp_sub(ieee754dp x, ieee754dp y);
129 ieee754dp ieee754dp_mul(ieee754dp x, ieee754dp y);
130 ieee754dp ieee754dp_div(ieee754dp x, ieee754dp y);
132 ieee754dp ieee754dp_abs(ieee754dp x);
133 ieee754dp ieee754dp_neg(ieee754dp x);
134 ieee754dp ieee754dp_scalb(ieee754dp x, int);
136 /* return exponent as integer in floating point format
138 ieee754dp ieee754dp_logb(ieee754dp x);
140 ieee754dp ieee754dp_fint(int x);
141 ieee754dp ieee754dp_funs(unsigned x);
142 ieee754dp ieee754dp_flong(s64 x);
143 ieee754dp ieee754dp_fulong(u64 x);
144 ieee754dp ieee754dp_fsp(ieee754sp x);
146 ieee754dp ieee754dp_ceil(ieee754dp x);
147 ieee754dp ieee754dp_floor(ieee754dp x);
148 ieee754dp ieee754dp_trunc(ieee754dp x);
150 int ieee754dp_tint(ieee754dp x);
151 unsigned int ieee754dp_tuns(ieee754dp x);
152 s64 ieee754dp_tlong(ieee754dp x);
153 u64 ieee754dp_tulong(ieee754dp x);
155 int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop, int sig);
159 ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip);
160 ieee754dp ieee754dp_frexp(ieee754dp x, int *exp);
161 ieee754dp ieee754dp_ldexp(ieee754dp x, int exp);
163 ieee754dp ieee754dp_ceil(ieee754dp x);
164 ieee754dp ieee754dp_floor(ieee754dp x);
165 ieee754dp ieee754dp_trunc(ieee754dp x);
167 ieee754dp ieee754dp_sqrt(ieee754dp x);
171 /* 5 types of floating point number
173 #define IEEE754_CLASS_NORM 0x00
174 #define IEEE754_CLASS_ZERO 0x01
175 #define IEEE754_CLASS_DNORM 0x02
176 #define IEEE754_CLASS_INF 0x03
177 #define IEEE754_CLASS_SNAN 0x04
178 #define IEEE754_CLASS_QNAN 0x05
180 /* exception numbers */
181 #define IEEE754_INEXACT 0x01
182 #define IEEE754_UNDERFLOW 0x02
183 #define IEEE754_OVERFLOW 0x04
184 #define IEEE754_ZERO_DIVIDE 0x08
185 #define IEEE754_INVALID_OPERATION 0x10
189 #define IEEE754_CLT 0x01
190 #define IEEE754_CEQ 0x02
191 #define IEEE754_CGT 0x04
192 #define IEEE754_CUN 0x08
196 #define IEEE754_RN 0 /* round to nearest */
197 #define IEEE754_RZ 1 /* round toward zero */
198 #define IEEE754_RD 2 /* round toward -Infinity */
199 #define IEEE754_RU 3 /* round toward +Infinity */
202 #define IEEE754_RM IEEE754_RD
203 #define IEEE754_RP IEEE754_RU
205 /* "normal" comparisons
207 static inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
209 return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
212 static inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
214 return ieee754sp_cmp(x, y,
215 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
218 static inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
220 return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
223 static inline int ieee754sp_le(ieee754sp x, ieee754sp y)
225 return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
228 static inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
230 return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
234 static inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
236 return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
239 static inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
241 return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
244 static inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
246 return ieee754dp_cmp(x, y,
247 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
250 static inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
252 return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
255 static inline int ieee754dp_le(ieee754dp x, ieee754dp y)
257 return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
260 static inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
262 return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
265 static inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
267 return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
274 ieee754dp ieee754dp_fstr(const char *s, char **endp);
275 char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
279 * The control status register
281 struct _ieee754_csr {
282 __BITFIELD_FIELD(unsigned pad0:7,
283 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormalised numbers */
284 __BITFIELD_FIELD(unsigned c:1, /* condition */
285 __BITFIELD_FIELD(unsigned pad1:5,
286 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
287 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
288 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
289 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
292 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
294 static inline unsigned ieee754_getrm(void)
296 return (ieee754_csr.rm);
298 static inline unsigned ieee754_setrm(unsigned rm)
300 return (ieee754_csr.rm = rm);
304 * get current exceptions
306 static inline unsigned ieee754_getcx(void)
308 return (ieee754_csr.cx);
311 /* test for current exception condition
313 static inline int ieee754_cxtest(unsigned n)
315 return (ieee754_csr.cx & n);
319 * get sticky exceptions
321 static inline unsigned ieee754_getsx(void)
323 return (ieee754_csr.sx);
326 /* clear sticky conditions
328 static inline unsigned ieee754_clrsx(void)
330 return (ieee754_csr.sx = 0);
333 /* test for sticky exception condition
335 static inline int ieee754_sxtest(unsigned n)
337 return (ieee754_csr.sx & n);
341 ieee754sp ieee754sp_dump(char *s, ieee754sp x);
342 ieee754dp ieee754dp_dump(char *s, ieee754dp x);
344 #define IEEE754_SPCVAL_PZERO 0
345 #define IEEE754_SPCVAL_NZERO 1
346 #define IEEE754_SPCVAL_PONE 2
347 #define IEEE754_SPCVAL_NONE 3
348 #define IEEE754_SPCVAL_PTEN 4
349 #define IEEE754_SPCVAL_NTEN 5
350 #define IEEE754_SPCVAL_PINFINITY 6
351 #define IEEE754_SPCVAL_NINFINITY 7
352 #define IEEE754_SPCVAL_INDEF 8
353 #define IEEE754_SPCVAL_PMAX 9 /* +max norm */
354 #define IEEE754_SPCVAL_NMAX 10 /* -max norm */
355 #define IEEE754_SPCVAL_PMIN 11 /* +min norm */
356 #define IEEE754_SPCVAL_NMIN 12 /* +min norm */
357 #define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
358 #define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
359 #define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
360 #define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
362 extern const struct ieee754dp_const __ieee754dp_spcvals[];
363 extern const struct ieee754sp_const __ieee754sp_spcvals[];
364 #define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
365 #define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
368 * Return infinity with given sign
370 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
371 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
372 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
373 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
374 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
375 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
376 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
377 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
378 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
379 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
381 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
382 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
383 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
384 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
385 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
386 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
387 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
388 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
389 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
390 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
393 * Indefinite integer value
395 #define ieee754si_indef() INT_MAX
397 #define ieee754di_indef() LONG_LONG_MAX
399 #define ieee754di_indef() ((s64)(~0ULL>>1))
402 /* IEEE exception context, passed to handler */
404 const char *op; /* operation name */
405 int rt; /* result type */
407 ieee754sp sp; /* single precision */
408 ieee754dp dp; /* double precision */
410 ieee754xp xp; /* extended precision */
412 int si; /* standard signed integer (32bits) */
413 s64 di; /* extended signed integer (64bits) */
414 } rv; /* default result format implied by op */
418 /* result types for xctx.rt */
419 #define IEEE754_RT_SP 0
420 #define IEEE754_RT_DP 1
421 #define IEEE754_RT_XP 2
422 #define IEEE754_RT_SI 3
423 #define IEEE754_RT_DI 4
425 extern void __cold ieee754_xcpt(struct ieee754xctx *xcp);
428 #define ieee754dp_fix(x) ieee754dp_tint(x)
429 #define ieee754sp_fix(x) ieee754sp_tint(x)
431 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */