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 union ieee754sp ieee754sp_rint(union ieee754sp x); 71 72 int ieee754sp_tint(union ieee754sp x); 73 s64 ieee754sp_tlong(union ieee754sp x); 74 75 int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); 76 77 union ieee754sp ieee754sp_sqrt(union ieee754sp x); 78 79 union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, 80 union ieee754sp y); 81 union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, 82 union ieee754sp y); 83 int ieee754sp_2008class(union ieee754sp x); 84 union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y); 85 union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y); 86 union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y); 87 union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y); 88 89 /* 90 * double precision (often aka double) 91 */ 92 int ieee754dp_class(union ieee754dp x); 93 94 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); 95 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); 96 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); 97 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); 98 99 union ieee754dp ieee754dp_abs(union ieee754dp x); 100 union ieee754dp ieee754dp_neg(union ieee754dp x); 101 102 union ieee754dp ieee754dp_fint(int x); 103 union ieee754dp ieee754dp_flong(s64 x); 104 union ieee754dp ieee754dp_fsp(union ieee754sp x); 105 union ieee754dp ieee754dp_rint(union ieee754dp x); 106 107 int ieee754dp_tint(union ieee754dp x); 108 s64 ieee754dp_tlong(union ieee754dp x); 109 110 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); 111 112 union ieee754dp ieee754dp_sqrt(union ieee754dp x); 113 114 union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, 115 union ieee754dp y); 116 union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, 117 union ieee754dp y); 118 int ieee754dp_2008class(union ieee754dp x); 119 union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y); 120 union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y); 121 union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y); 122 union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y); 123 124 125 /* 5 types of floating point number 126 */ 127 enum { 128 IEEE754_CLASS_NORM = 0x00, 129 IEEE754_CLASS_ZERO = 0x01, 130 IEEE754_CLASS_DNORM = 0x02, 131 IEEE754_CLASS_INF = 0x03, 132 IEEE754_CLASS_SNAN = 0x04, 133 IEEE754_CLASS_QNAN = 0x05, 134 }; 135 136 /* exception numbers */ 137 #define IEEE754_INEXACT 0x01 138 #define IEEE754_UNDERFLOW 0x02 139 #define IEEE754_OVERFLOW 0x04 140 #define IEEE754_ZERO_DIVIDE 0x08 141 #define IEEE754_INVALID_OPERATION 0x10 142 143 /* cmp operators 144 */ 145 #define IEEE754_CLT 0x01 146 #define IEEE754_CEQ 0x02 147 #define IEEE754_CGT 0x04 148 #define IEEE754_CUN 0x08 149 150 /* 151 * The control status register 152 */ 153 struct _ieee754_csr { 154 __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ 155 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ 156 __BITFIELD_FIELD(unsigned c:1, /* condition[0] */ 157 __BITFIELD_FIELD(unsigned pad0:3, 158 __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ 159 __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ 160 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ 161 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ 162 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ 163 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ 164 ;)))))))))) 165 }; 166 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 167 ieee754_getrm(void)168 static inline unsigned int ieee754_getrm(void) 169 { 170 return (ieee754_csr.rm); 171 } 172 ieee754_setrm(unsigned int rm)173 static inline unsigned int ieee754_setrm(unsigned int rm) 174 { 175 return (ieee754_csr.rm = rm); 176 } 177 178 /* 179 * get current exceptions 180 */ ieee754_getcx(void)181 static inline unsigned int ieee754_getcx(void) 182 { 183 return (ieee754_csr.cx); 184 } 185 186 /* test for current exception condition 187 */ ieee754_cxtest(unsigned int n)188 static inline int ieee754_cxtest(unsigned int n) 189 { 190 return (ieee754_csr.cx & n); 191 } 192 193 /* 194 * get sticky exceptions 195 */ ieee754_getsx(void)196 static inline unsigned int ieee754_getsx(void) 197 { 198 return (ieee754_csr.sx); 199 } 200 201 /* clear sticky conditions 202 */ ieee754_clrsx(void)203 static inline unsigned int ieee754_clrsx(void) 204 { 205 return (ieee754_csr.sx = 0); 206 } 207 208 /* test for sticky exception condition 209 */ ieee754_sxtest(unsigned int n)210 static inline int ieee754_sxtest(unsigned int n) 211 { 212 return (ieee754_csr.sx & n); 213 } 214 215 /* debugging */ 216 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); 217 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); 218 219 #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ 220 #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ 221 #define IEEE754_SPCVAL_PONE 2 /* +1.0 */ 222 #define IEEE754_SPCVAL_NONE 3 /* -1.0 */ 223 #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ 224 #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ 225 #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ 226 #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ 227 #define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ 228 #define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ 229 #define IEEE754_SPCVAL_PMAX 10 /* +max norm */ 230 #define IEEE754_SPCVAL_NMAX 11 /* -max norm */ 231 #define IEEE754_SPCVAL_PMIN 12 /* +min norm */ 232 #define IEEE754_SPCVAL_NMIN 13 /* -min norm */ 233 #define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ 234 #define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ 235 #define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ 236 #define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ 237 238 extern const union ieee754dp __ieee754dp_spcvals[]; 239 extern const union ieee754sp __ieee754sp_spcvals[]; 240 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) 241 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) 242 243 /* 244 * Return infinity with given sign 245 */ 246 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 247 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 248 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 249 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 250 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ 251 ieee754_csr.nan2008]) 252 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 253 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 254 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 255 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) 256 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) 257 258 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 259 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 260 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 261 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 262 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ 263 ieee754_csr.nan2008]) 264 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 265 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 266 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 267 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) 268 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) 269 270 /* 271 * Indefinite integer value 272 */ ieee754si_indef(void)273 static inline int ieee754si_indef(void) 274 { 275 return ieee754_csr.nan2008 ? 0 : INT_MAX; 276 } 277 ieee754di_indef(void)278 static inline s64 ieee754di_indef(void) 279 { 280 return ieee754_csr.nan2008 ? 0 : S64_MAX; 281 } 282 283 /* 284 * Overflow integer value 285 */ ieee754si_overflow(int xs)286 static inline int ieee754si_overflow(int xs) 287 { 288 return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; 289 } 290 ieee754di_overflow(int xs)291 static inline s64 ieee754di_overflow(int xs) 292 { 293 return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; 294 } 295 296 /* result types for xctx.rt */ 297 #define IEEE754_RT_SP 0 298 #define IEEE754_RT_DP 1 299 #define IEEE754_RT_XP 2 300 #define IEEE754_RT_SI 3 301 #define IEEE754_RT_DI 4 302 303 /* compat */ 304 #define ieee754dp_fix(x) ieee754dp_tint(x) 305 #define ieee754sp_fix(x) ieee754sp_tint(x) 306 307 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ 308
