Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * MIPS floating point support | |
3 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
1da177e4 | 4 | * |
1da177e4 LT |
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., | |
3f7cac41 | 16 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
1da177e4 | 17 | * |
1da177e4 LT |
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. | |
cd21dfcf | 23 | */ |
a663bf90 RB |
24 | #ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H |
25 | #define __ARCH_MIPS_MATH_EMU_IEEE754_H | |
1da177e4 | 26 | |
cae55066 | 27 | #include <linux/compiler.h> |
cd21dfcf | 28 | #include <asm/byteorder.h> |
e812a739 | 29 | #include <linux/kernel.h> |
1da177e4 | 30 | #include <linux/types.h> |
cd21dfcf | 31 | #include <linux/sched.h> |
f80cc08d | 32 | #include <asm/bitfield.h> |
1da177e4 | 33 | |
2209bcb1 | 34 | union ieee754dp { |
1da177e4 | 35 | struct { |
f80cc08d RB |
36 | __BITFIELD_FIELD(unsigned int sign:1, |
37 | __BITFIELD_FIELD(unsigned int bexp:11, | |
38 | __BITFIELD_FIELD(u64 mant:52, | |
39 | ;))) | |
49548b09 | 40 | }; |
1da177e4 | 41 | u64 bits; |
2209bcb1 | 42 | }; |
1da177e4 | 43 | |
2209bcb1 | 44 | union ieee754sp { |
49548b09 RB |
45 | struct { |
46 | __BITFIELD_FIELD(unsigned sign:1, | |
47 | __BITFIELD_FIELD(unsigned bexp:8, | |
48 | __BITFIELD_FIELD(unsigned mant:23, | |
49 | ;))) | |
50 | }; | |
1da177e4 | 51 | u32 bits; |
2209bcb1 | 52 | }; |
1da177e4 LT |
53 | |
54 | /* | |
55 | * single precision (often aka float) | |
56 | */ | |
2209bcb1 | 57 | int ieee754sp_class(union ieee754sp x); |
1da177e4 | 58 | |
2209bcb1 RB |
59 | union ieee754sp ieee754sp_abs(union ieee754sp x); |
60 | union ieee754sp ieee754sp_neg(union ieee754sp x); | |
1da177e4 | 61 | |
2209bcb1 RB |
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); | |
1da177e4 | 66 | |
2209bcb1 | 67 | union ieee754sp ieee754sp_fint(int x); |
2209bcb1 | 68 | union ieee754sp ieee754sp_flong(s64 x); |
2209bcb1 | 69 | union ieee754sp ieee754sp_fdp(union ieee754dp x); |
1da177e4 | 70 | |
2209bcb1 | 71 | int ieee754sp_tint(union ieee754sp x); |
2209bcb1 | 72 | s64 ieee754sp_tlong(union ieee754sp x); |
1da177e4 | 73 | |
2209bcb1 | 74 | int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); |
1da177e4 | 75 | |
2209bcb1 | 76 | union ieee754sp ieee754sp_sqrt(union ieee754sp x); |
1da177e4 | 77 | |
e24c3bec MC |
78 | union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, |
79 | union ieee754sp y); | |
83d43305 MC |
80 | union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, |
81 | union ieee754sp y); | |
38db37ba | 82 | int ieee754sp_2008class(union ieee754sp x); |
4e9561b2 MC |
83 | union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y); |
84 | union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y); | |
a79f5f9b MC |
85 | union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y); |
86 | union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y); | |
e24c3bec | 87 | |
1da177e4 LT |
88 | /* |
89 | * double precision (often aka double) | |
90 | */ | |
2209bcb1 | 91 | int ieee754dp_class(union ieee754dp x); |
1da177e4 | 92 | |
2209bcb1 RB |
93 | union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); |
94 | union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); | |
95 | union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); | |
96 | union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); | |
1da177e4 | 97 | |
2209bcb1 RB |
98 | union ieee754dp ieee754dp_abs(union ieee754dp x); |
99 | union ieee754dp ieee754dp_neg(union ieee754dp x); | |
1da177e4 | 100 | |
2209bcb1 | 101 | union ieee754dp ieee754dp_fint(int x); |
2209bcb1 | 102 | union ieee754dp ieee754dp_flong(s64 x); |
2209bcb1 | 103 | union ieee754dp ieee754dp_fsp(union ieee754sp x); |
1da177e4 | 104 | |
2209bcb1 | 105 | int ieee754dp_tint(union ieee754dp x); |
2209bcb1 | 106 | s64 ieee754dp_tlong(union ieee754dp x); |
1da177e4 | 107 | |
2209bcb1 | 108 | int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); |
1da177e4 | 109 | |
2209bcb1 | 110 | union ieee754dp ieee754dp_sqrt(union ieee754dp x); |
1da177e4 | 111 | |
e24c3bec MC |
112 | union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, |
113 | union ieee754dp y); | |
83d43305 MC |
114 | union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, |
115 | union ieee754dp y); | |
38db37ba | 116 | int ieee754dp_2008class(union ieee754dp x); |
4e9561b2 MC |
117 | union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y); |
118 | union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y); | |
a79f5f9b MC |
119 | union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y); |
120 | union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y); | |
1da177e4 LT |
121 | |
122 | ||
123 | /* 5 types of floating point number | |
124 | */ | |
9e8bad1f RB |
125 | enum { |
126 | IEEE754_CLASS_NORM = 0x00, | |
127 | IEEE754_CLASS_ZERO = 0x01, | |
128 | IEEE754_CLASS_DNORM = 0x02, | |
129 | IEEE754_CLASS_INF = 0x03, | |
130 | IEEE754_CLASS_SNAN = 0x04, | |
131 | IEEE754_CLASS_QNAN = 0x05, | |
132 | }; | |
1da177e4 LT |
133 | |
134 | /* exception numbers */ | |
135 | #define IEEE754_INEXACT 0x01 | |
136 | #define IEEE754_UNDERFLOW 0x02 | |
137 | #define IEEE754_OVERFLOW 0x04 | |
138 | #define IEEE754_ZERO_DIVIDE 0x08 | |
139 | #define IEEE754_INVALID_OPERATION 0x10 | |
140 | ||
141 | /* cmp operators | |
142 | */ | |
143 | #define IEEE754_CLT 0x01 | |
144 | #define IEEE754_CEQ 0x02 | |
145 | #define IEEE754_CGT 0x04 | |
146 | #define IEEE754_CUN 0x08 | |
147 | ||
cd21dfcf RB |
148 | /* |
149 | * The control status register | |
150 | */ | |
151 | struct _ieee754_csr { | |
f1f3b7eb MR |
152 | __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ |
153 | __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ | |
154 | __BITFIELD_FIELD(unsigned c:1, /* condition[0] */ | |
155 | __BITFIELD_FIELD(unsigned pad0:3, | |
156 | __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ | |
157 | __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ | |
f80cc08d RB |
158 | __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ |
159 | __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ | |
160 | __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ | |
161 | __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ | |
f1f3b7eb | 162 | ;)))))))))) |
1da177e4 | 163 | }; |
eae89076 | 164 | #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) |
1da177e4 | 165 | |
cd21dfcf | 166 | static inline unsigned ieee754_getrm(void) |
1da177e4 LT |
167 | { |
168 | return (ieee754_csr.rm); | |
169 | } | |
cd21dfcf | 170 | static inline unsigned ieee754_setrm(unsigned rm) |
1da177e4 LT |
171 | { |
172 | return (ieee754_csr.rm = rm); | |
173 | } | |
174 | ||
175 | /* | |
176 | * get current exceptions | |
177 | */ | |
cd21dfcf | 178 | static inline unsigned ieee754_getcx(void) |
1da177e4 LT |
179 | { |
180 | return (ieee754_csr.cx); | |
181 | } | |
182 | ||
183 | /* test for current exception condition | |
184 | */ | |
cd21dfcf | 185 | static inline int ieee754_cxtest(unsigned n) |
1da177e4 LT |
186 | { |
187 | return (ieee754_csr.cx & n); | |
188 | } | |
189 | ||
190 | /* | |
191 | * get sticky exceptions | |
192 | */ | |
cd21dfcf | 193 | static inline unsigned ieee754_getsx(void) |
1da177e4 LT |
194 | { |
195 | return (ieee754_csr.sx); | |
196 | } | |
197 | ||
198 | /* clear sticky conditions | |
199 | */ | |
cd21dfcf | 200 | static inline unsigned ieee754_clrsx(void) |
1da177e4 LT |
201 | { |
202 | return (ieee754_csr.sx = 0); | |
203 | } | |
204 | ||
205 | /* test for sticky exception condition | |
206 | */ | |
cd21dfcf | 207 | static inline int ieee754_sxtest(unsigned n) |
1da177e4 LT |
208 | { |
209 | return (ieee754_csr.sx & n); | |
210 | } | |
211 | ||
212 | /* debugging */ | |
2209bcb1 RB |
213 | union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); |
214 | union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); | |
1da177e4 | 215 | |
1796ec77 MR |
216 | #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ |
217 | #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ | |
218 | #define IEEE754_SPCVAL_PONE 2 /* +1.0 */ | |
219 | #define IEEE754_SPCVAL_NONE 3 /* -1.0 */ | |
220 | #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ | |
221 | #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ | |
222 | #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ | |
223 | #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ | |
90d53a91 MR |
224 | #define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ |
225 | #define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ | |
226 | #define IEEE754_SPCVAL_PMAX 10 /* +max norm */ | |
227 | #define IEEE754_SPCVAL_NMAX 11 /* -max norm */ | |
228 | #define IEEE754_SPCVAL_PMIN 12 /* +min norm */ | |
229 | #define IEEE754_SPCVAL_NMIN 13 /* -min norm */ | |
230 | #define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ | |
231 | #define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ | |
232 | #define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ | |
233 | #define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ | |
1da177e4 | 234 | |
49548b09 RB |
235 | extern const union ieee754dp __ieee754dp_spcvals[]; |
236 | extern const union ieee754sp __ieee754sp_spcvals[]; | |
2209bcb1 RB |
237 | #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) |
238 | #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) | |
1da177e4 | 239 | |
cd21dfcf RB |
240 | /* |
241 | * Return infinity with given sign | |
242 | */ | |
243 | #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) | |
244 | #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) | |
245 | #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) | |
246 | #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) | |
90d53a91 MR |
247 | #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ |
248 | ieee754_csr.nan2008]) | |
cd21dfcf RB |
249 | #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) |
250 | #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) | |
251 | #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) | |
252 | #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) | |
253 | #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) | |
254 | ||
255 | #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) | |
256 | #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) | |
257 | #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) | |
258 | #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) | |
90d53a91 MR |
259 | #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ |
260 | ieee754_csr.nan2008]) | |
cd21dfcf RB |
261 | #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) |
262 | #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) | |
263 | #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) | |
264 | #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) | |
265 | #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) | |
266 | ||
267 | /* | |
268 | * Indefinite integer value | |
269 | */ | |
e812a739 RB |
270 | static inline int ieee754si_indef(void) |
271 | { | |
90d53a91 | 272 | return ieee754_csr.nan2008 ? 0 : INT_MAX; |
e812a739 RB |
273 | } |
274 | ||
275 | static inline s64 ieee754di_indef(void) | |
276 | { | |
90d53a91 MR |
277 | return ieee754_csr.nan2008 ? 0 : S64_MAX; |
278 | } | |
279 | ||
280 | /* | |
281 | * Overflow integer value | |
282 | */ | |
283 | static inline int ieee754si_overflow(int xs) | |
284 | { | |
285 | return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; | |
286 | } | |
287 | ||
288 | static inline s64 ieee754di_overflow(int xs) | |
289 | { | |
290 | return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; | |
e812a739 | 291 | } |
1da177e4 | 292 | |
1da177e4 LT |
293 | /* result types for xctx.rt */ |
294 | #define IEEE754_RT_SP 0 | |
295 | #define IEEE754_RT_DP 1 | |
296 | #define IEEE754_RT_XP 2 | |
297 | #define IEEE754_RT_SI 3 | |
298 | #define IEEE754_RT_DI 4 | |
299 | ||
1da177e4 LT |
300 | /* compat */ |
301 | #define ieee754dp_fix(x) ieee754dp_tint(x) | |
302 | #define ieee754sp_fix(x) ieee754sp_tint(x) | |
a663bf90 RB |
303 | |
304 | #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ |