1 /* 2 * MIPS floating point support 3 * Copyright (C) 1994-2000 Algorithmics Ltd. 4 * 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., 16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 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. 23 */ 24 #ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H 25 #define __ARCH_MIPS_MATH_EMU_IEEE754_H 26 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> 33 34 union ieee754dp { 35 struct { 36 __BITFIELD_FIELD(unsigned int sign:1, 37 __BITFIELD_FIELD(unsigned int bexp:11, 38 __BITFIELD_FIELD(u64 mant:52, 39 ;))) 40 }; 41 u64 bits; 42 }; 43 44 union ieee754sp { 45 struct { 46 __BITFIELD_FIELD(unsigned sign:1, 47 __BITFIELD_FIELD(unsigned bexp:8, 48 __BITFIELD_FIELD(unsigned mant:23, 49 ;))) 50 }; 51 u32 bits; 52 }; 53 54 /* 55 * single precision (often aka float) 56 */ 57 int ieee754sp_class(union ieee754sp x); 58 59 union ieee754sp ieee754sp_abs(union ieee754sp x); 60 union ieee754sp ieee754sp_neg(union ieee754sp x); 61 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); 66 67 union ieee754sp ieee754sp_fint(int x); 68 union ieee754sp ieee754sp_flong(s64 x); 69 union ieee754sp ieee754sp_fdp(union ieee754dp x); 70 71 int ieee754sp_tint(union ieee754sp x); 72 s64 ieee754sp_tlong(union ieee754sp x); 73 74 int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); 75 76 union ieee754sp ieee754sp_sqrt(union ieee754sp x); 77 78 /* 79 * double precision (often aka double) 80 */ 81 int ieee754dp_class(union ieee754dp x); 82 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); 87 88 union ieee754dp ieee754dp_abs(union ieee754dp x); 89 union ieee754dp ieee754dp_neg(union ieee754dp x); 90 91 union ieee754dp ieee754dp_fint(int x); 92 union ieee754dp ieee754dp_flong(s64 x); 93 union ieee754dp ieee754dp_fsp(union ieee754sp x); 94 95 int ieee754dp_tint(union ieee754dp x); 96 s64 ieee754dp_tlong(union ieee754dp x); 97 98 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); 99 100 union ieee754dp ieee754dp_sqrt(union ieee754dp x); 101 102 103 104 /* 5 types of floating point number 105 */ 106 enum { 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, 113 }; 114 115 /* 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 121 122 /* cmp operators 123 */ 124 #define IEEE754_CLT 0x01 125 #define IEEE754_CEQ 0x02 126 #define IEEE754_CGT 0x04 127 #define IEEE754_CUN 0x08 128 129 /* "normal" comparisons 130 */ 131 static inline int ieee754sp_eq(union ieee754sp x, union ieee754sp y) 132 { 133 return ieee754sp_cmp(x, y, IEEE754_CEQ, 0); 134 } 135 136 static inline int ieee754sp_ne(union ieee754sp x, union ieee754sp y) 137 { 138 return ieee754sp_cmp(x, y, 139 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0); 140 } 141 142 static inline int ieee754sp_lt(union ieee754sp x, union ieee754sp y) 143 { 144 return ieee754sp_cmp(x, y, IEEE754_CLT, 0); 145 } 146 147 static inline int ieee754sp_le(union ieee754sp x, union ieee754sp y) 148 { 149 return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0); 150 } 151 152 static inline int ieee754sp_gt(union ieee754sp x, union ieee754sp y) 153 { 154 return ieee754sp_cmp(x, y, IEEE754_CGT, 0); 155 } 156 157 158 static inline int ieee754sp_ge(union ieee754sp x, union ieee754sp y) 159 { 160 return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0); 161 } 162 163 static inline int ieee754dp_eq(union ieee754dp x, union ieee754dp y) 164 { 165 return ieee754dp_cmp(x, y, IEEE754_CEQ, 0); 166 } 167 168 static inline int ieee754dp_ne(union ieee754dp x, union ieee754dp y) 169 { 170 return ieee754dp_cmp(x, y, 171 IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0); 172 } 173 174 static inline int ieee754dp_lt(union ieee754dp x, union ieee754dp y) 175 { 176 return ieee754dp_cmp(x, y, IEEE754_CLT, 0); 177 } 178 179 static inline int ieee754dp_le(union ieee754dp x, union ieee754dp y) 180 { 181 return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0); 182 } 183 184 static inline int ieee754dp_gt(union ieee754dp x, union ieee754dp y) 185 { 186 return ieee754dp_cmp(x, y, IEEE754_CGT, 0); 187 } 188 189 static inline int ieee754dp_ge(union ieee754dp x, union ieee754dp y) 190 { 191 return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0); 192 } 193 194 /* 195 * The control status register 196 */ 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 */ 206 ;)))))))) 207 }; 208 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 209 210 static inline unsigned ieee754_getrm(void) 211 { 212 return (ieee754_csr.rm); 213 } 214 static inline unsigned ieee754_setrm(unsigned rm) 215 { 216 return (ieee754_csr.rm = rm); 217 } 218 219 /* 220 * get current exceptions 221 */ 222 static inline unsigned ieee754_getcx(void) 223 { 224 return (ieee754_csr.cx); 225 } 226 227 /* test for current exception condition 228 */ 229 static inline int ieee754_cxtest(unsigned n) 230 { 231 return (ieee754_csr.cx & n); 232 } 233 234 /* 235 * get sticky exceptions 236 */ 237 static inline unsigned ieee754_getsx(void) 238 { 239 return (ieee754_csr.sx); 240 } 241 242 /* clear sticky conditions 243 */ 244 static inline unsigned ieee754_clrsx(void) 245 { 246 return (ieee754_csr.sx = 0); 247 } 248 249 /* test for sticky exception condition 250 */ 251 static inline int ieee754_sxtest(unsigned n) 252 { 253 return (ieee754_csr.sx & n); 254 } 255 256 /* debugging */ 257 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); 258 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); 259 260 #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 */ 277 278 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) 282 283 /* 284 * Return infinity with given sign 285 */ 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]) 296 297 #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]) 307 308 /* 309 * Indefinite integer value 310 */ 311 static inline int ieee754si_indef(void) 312 { 313 return INT_MAX; 314 } 315 316 static inline s64 ieee754di_indef(void) 317 { 318 return S64_MAX; 319 } 320 321 /* 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 4 327 328 /* compat */ 329 #define ieee754dp_fix(x) ieee754dp_tint(x) 330 #define ieee754sp_fix(x) ieee754sp_tint(x) 331 332 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ 333