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);
78 union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x,
80 union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x,
84 * double precision (often aka double)
86 int ieee754dp_class(union ieee754dp x);
88 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
89 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
90 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
91 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
93 union ieee754dp ieee754dp_abs(union ieee754dp x);
94 union ieee754dp ieee754dp_neg(union ieee754dp x);
96 union ieee754dp ieee754dp_fint(int x);
97 union ieee754dp ieee754dp_flong(s64 x);
98 union ieee754dp ieee754dp_fsp(union ieee754sp x);
100 int ieee754dp_tint(union ieee754dp x);
101 s64 ieee754dp_tlong(union ieee754dp x);
103 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
105 union ieee754dp ieee754dp_sqrt(union ieee754dp x);
107 union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x,
109 union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x,
113 /* 5 types of floating point number
116 IEEE754_CLASS_NORM = 0x00,
117 IEEE754_CLASS_ZERO = 0x01,
118 IEEE754_CLASS_DNORM = 0x02,
119 IEEE754_CLASS_INF = 0x03,
120 IEEE754_CLASS_SNAN = 0x04,
121 IEEE754_CLASS_QNAN = 0x05,
124 /* exception numbers */
125 #define IEEE754_INEXACT 0x01
126 #define IEEE754_UNDERFLOW 0x02
127 #define IEEE754_OVERFLOW 0x04
128 #define IEEE754_ZERO_DIVIDE 0x08
129 #define IEEE754_INVALID_OPERATION 0x10
133 #define IEEE754_CLT 0x01
134 #define IEEE754_CEQ 0x02
135 #define IEEE754_CGT 0x04
136 #define IEEE754_CUN 0x08
139 * The control status register
141 struct _ieee754_csr {
142 __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */
143 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */
144 __BITFIELD_FIELD(unsigned c:1, /* condition[0] */
145 __BITFIELD_FIELD(unsigned pad0:3,
146 __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */
147 __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */
148 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
149 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
150 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
151 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
154 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
156 static inline unsigned ieee754_getrm(void)
158 return (ieee754_csr.rm);
160 static inline unsigned ieee754_setrm(unsigned rm)
162 return (ieee754_csr.rm = rm);
166 * get current exceptions
168 static inline unsigned ieee754_getcx(void)
170 return (ieee754_csr.cx);
173 /* test for current exception condition
175 static inline int ieee754_cxtest(unsigned n)
177 return (ieee754_csr.cx & n);
181 * get sticky exceptions
183 static inline unsigned ieee754_getsx(void)
185 return (ieee754_csr.sx);
188 /* clear sticky conditions
190 static inline unsigned ieee754_clrsx(void)
192 return (ieee754_csr.sx = 0);
195 /* test for sticky exception condition
197 static inline int ieee754_sxtest(unsigned n)
199 return (ieee754_csr.sx & n);
203 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
204 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
206 #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */
207 #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */
208 #define IEEE754_SPCVAL_PONE 2 /* +1.0 */
209 #define IEEE754_SPCVAL_NONE 3 /* -1.0 */
210 #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */
211 #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */
212 #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */
213 #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */
214 #define IEEE754_SPCVAL_INDEF 8 /* quiet NaN */
215 #define IEEE754_SPCVAL_PMAX 9 /* +max norm */
216 #define IEEE754_SPCVAL_NMAX 10 /* -max norm */
217 #define IEEE754_SPCVAL_PMIN 11 /* +min norm */
218 #define IEEE754_SPCVAL_NMIN 12 /* -min norm */
219 #define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
220 #define IEEE754_SPCVAL_NMIND 14 /* -min denorm */
221 #define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
222 #define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
224 extern const union ieee754dp __ieee754dp_spcvals[];
225 extern const union ieee754sp __ieee754sp_spcvals[];
226 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
227 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
230 * Return infinity with given sign
232 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
233 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
234 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
235 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
236 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
237 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
238 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
239 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
240 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
241 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
243 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
244 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
245 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
246 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
247 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
248 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
249 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
250 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
251 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
252 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
255 * Indefinite integer value
257 static inline int ieee754si_indef(void)
262 static inline s64 ieee754di_indef(void)
267 /* result types for xctx.rt */
268 #define IEEE754_RT_SP 0
269 #define IEEE754_RT_DP 1
270 #define IEEE754_RT_XP 2
271 #define IEEE754_RT_SI 3
272 #define IEEE754_RT_DI 4
275 #define ieee754dp_fix(x) ieee754dp_tint(x)
276 #define ieee754sp_fix(x) ieee754sp_tint(x)
278 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */