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 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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/kernel.h>
30 #include <linux/types.h>
31 #include <linux/sched.h>
32 #include <asm/bitfield.h>
36 __BITFIELD_FIELD(unsigned int sign:1,
37 __BITFIELD_FIELD(unsigned int bexp:11,
38 __BITFIELD_FIELD(u64 mant:52,
46 __BITFIELD_FIELD(unsigned sign:1,
47 __BITFIELD_FIELD(unsigned bexp:8,
48 __BITFIELD_FIELD(unsigned mant:23,
55 * single precision (often aka float)
57 int ieee754sp_class(union ieee754sp x);
59 union ieee754sp ieee754sp_abs(union ieee754sp x);
60 union ieee754sp ieee754sp_neg(union ieee754sp x);
62 union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y);
63 union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y);
64 union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y);
65 union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y);
67 union ieee754sp ieee754sp_fint(int x);
68 union ieee754sp ieee754sp_flong(s64 x);
69 union ieee754sp ieee754sp_fdp(union ieee754dp x);
71 int ieee754sp_tint(union ieee754sp x);
72 s64 ieee754sp_tlong(union ieee754sp x);
74 int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig);
76 union ieee754sp ieee754sp_sqrt(union ieee754sp x);
79 * double precision (often aka double)
81 int ieee754dp_class(union ieee754dp x);
83 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
84 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
85 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
86 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
88 union ieee754dp ieee754dp_abs(union ieee754dp x);
89 union ieee754dp ieee754dp_neg(union ieee754dp x);
91 union ieee754dp ieee754dp_fint(int x);
92 union ieee754dp ieee754dp_flong(s64 x);
93 union ieee754dp ieee754dp_fsp(union ieee754sp x);
95 int ieee754dp_tint(union ieee754dp x);
96 s64 ieee754dp_tlong(union ieee754dp x);
98 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
100 union ieee754dp ieee754dp_sqrt(union ieee754dp x);
104 /* 5 types of floating point number
107 IEEE754_CLASS_NORM = 0x00,
108 IEEE754_CLASS_ZERO = 0x01,
109 IEEE754_CLASS_DNORM = 0x02,
110 IEEE754_CLASS_INF = 0x03,
111 IEEE754_CLASS_SNAN = 0x04,
112 IEEE754_CLASS_QNAN = 0x05,
115 /* exception numbers */
116 #define IEEE754_INEXACT 0x01
117 #define IEEE754_UNDERFLOW 0x02
118 #define IEEE754_OVERFLOW 0x04
119 #define IEEE754_ZERO_DIVIDE 0x08
120 #define IEEE754_INVALID_OPERATION 0x10
124 #define IEEE754_CLT 0x01
125 #define IEEE754_CEQ 0x02
126 #define IEEE754_CGT 0x04
127 #define IEEE754_CUN 0x08
129 /* "normal" comparisons
131 static inline int ieee754sp_eq(union ieee754sp x, union ieee754sp y)
133 return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
136 static inline int ieee754sp_ne(union ieee754sp x, union ieee754sp y)
138 return ieee754sp_cmp(x, y,
139 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
142 static inline int ieee754sp_lt(union ieee754sp x, union ieee754sp y)
144 return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
147 static inline int ieee754sp_le(union ieee754sp x, union ieee754sp y)
149 return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
152 static inline int ieee754sp_gt(union ieee754sp x, union ieee754sp y)
154 return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
158 static inline int ieee754sp_ge(union ieee754sp x, union ieee754sp y)
160 return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
163 static inline int ieee754dp_eq(union ieee754dp x, union ieee754dp y)
165 return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
168 static inline int ieee754dp_ne(union ieee754dp x, union ieee754dp y)
170 return ieee754dp_cmp(x, y,
171 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
174 static inline int ieee754dp_lt(union ieee754dp x, union ieee754dp y)
176 return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
179 static inline int ieee754dp_le(union ieee754dp x, union ieee754dp y)
181 return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
184 static inline int ieee754dp_gt(union ieee754dp x, union ieee754dp y)
186 return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
189 static inline int ieee754dp_ge(union ieee754dp x, union ieee754dp y)
191 return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
195 * The control status register
197 struct _ieee754_csr {
198 __BITFIELD_FIELD(unsigned pad0:7,
199 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormalised numbers */
200 __BITFIELD_FIELD(unsigned c:1, /* condition */
201 __BITFIELD_FIELD(unsigned pad1:5,
202 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
203 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
204 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
205 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
208 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
210 static inline unsigned ieee754_getrm(void)
212 return (ieee754_csr.rm);
214 static inline unsigned ieee754_setrm(unsigned rm)
216 return (ieee754_csr.rm = rm);
220 * get current exceptions
222 static inline unsigned ieee754_getcx(void)
224 return (ieee754_csr.cx);
227 /* test for current exception condition
229 static inline int ieee754_cxtest(unsigned n)
231 return (ieee754_csr.cx & n);
235 * get sticky exceptions
237 static inline unsigned ieee754_getsx(void)
239 return (ieee754_csr.sx);
242 /* clear sticky conditions
244 static inline unsigned ieee754_clrsx(void)
246 return (ieee754_csr.sx = 0);
249 /* test for sticky exception condition
251 static inline int ieee754_sxtest(unsigned n)
253 return (ieee754_csr.sx & n);
257 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
258 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
260 #define IEEE754_SPCVAL_PZERO 0
261 #define IEEE754_SPCVAL_NZERO 1
262 #define IEEE754_SPCVAL_PONE 2
263 #define IEEE754_SPCVAL_NONE 3
264 #define IEEE754_SPCVAL_PTEN 4
265 #define IEEE754_SPCVAL_NTEN 5
266 #define IEEE754_SPCVAL_PINFINITY 6
267 #define IEEE754_SPCVAL_NINFINITY 7
268 #define IEEE754_SPCVAL_INDEF 8
269 #define IEEE754_SPCVAL_PMAX 9 /* +max norm */
270 #define IEEE754_SPCVAL_NMAX 10 /* -max norm */
271 #define IEEE754_SPCVAL_PMIN 11 /* +min norm */
272 #define IEEE754_SPCVAL_NMIN 12 /* +min norm */
273 #define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
274 #define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
275 #define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
276 #define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
278 extern const union ieee754dp __ieee754dp_spcvals[];
279 extern const union ieee754sp __ieee754sp_spcvals[];
280 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
281 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
284 * Return infinity with given sign
286 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
287 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
288 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
289 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
290 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
291 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
292 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
293 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
294 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
295 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
297 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
298 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
299 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
300 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
301 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
302 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
303 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
304 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
305 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
306 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
309 * Indefinite integer value
311 static inline int ieee754si_indef(void)
316 static inline s64 ieee754di_indef(void)
321 /* result types for xctx.rt */
322 #define IEEE754_RT_SP 0
323 #define IEEE754_RT_DP 1
324 #define IEEE754_RT_XP 2
325 #define IEEE754_RT_SI 3
326 #define IEEE754_RT_DI 4
329 #define ieee754dp_fix(x) ieee754dp_tint(x)
330 #define ieee754sp_fix(x) ieee754sp_tint(x)
332 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */