1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * MIPS floating point support 4 * Copyright (C) 1994-2000 Algorithmics Ltd. 5 * 6 * Nov 7, 2000 7 * Modification to allow integration with Linux kernel 8 * 9 * Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com 10 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. 11 */ 12 #ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H 13 #define __ARCH_MIPS_MATH_EMU_IEEE754_H 14 15 #include <linux/compiler.h> 16 #include <asm/byteorder.h> 17 #include <linux/kernel.h> 18 #include <linux/types.h> 19 #include <linux/sched.h> 20 #include <asm/bitfield.h> 21 22 union ieee754dp { 23 struct { 24 __BITFIELD_FIELD(unsigned int sign:1, 25 __BITFIELD_FIELD(unsigned int bexp:11, 26 __BITFIELD_FIELD(u64 mant:52, 27 ;))) 28 }; 29 u64 bits; 30 }; 31 32 union ieee754sp { 33 struct { 34 __BITFIELD_FIELD(unsigned sign:1, 35 __BITFIELD_FIELD(unsigned bexp:8, 36 __BITFIELD_FIELD(unsigned mant:23, 37 ;))) 38 }; 39 u32 bits; 40 }; 41 42 /* 43 * single precision (often aka float) 44 */ 45 int ieee754sp_class(union ieee754sp x); 46 47 union ieee754sp ieee754sp_abs(union ieee754sp x); 48 union ieee754sp ieee754sp_neg(union ieee754sp x); 49 50 union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y); 51 union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y); 52 union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y); 53 union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y); 54 55 union ieee754sp ieee754sp_fint(int x); 56 union ieee754sp ieee754sp_flong(s64 x); 57 union ieee754sp ieee754sp_fdp(union ieee754dp x); 58 union ieee754sp ieee754sp_rint(union ieee754sp x); 59 60 int ieee754sp_tint(union ieee754sp x); 61 s64 ieee754sp_tlong(union ieee754sp x); 62 63 int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); 64 65 union ieee754sp ieee754sp_sqrt(union ieee754sp x); 66 67 union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, 68 union ieee754sp y); 69 union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, 70 union ieee754sp y); 71 union ieee754sp ieee754sp_madd(union ieee754sp z, union ieee754sp x, 72 union ieee754sp y); 73 union ieee754sp ieee754sp_msub(union ieee754sp z, union ieee754sp x, 74 union ieee754sp y); 75 union ieee754sp ieee754sp_nmadd(union ieee754sp z, union ieee754sp x, 76 union ieee754sp y); 77 union ieee754sp ieee754sp_nmsub(union ieee754sp z, union ieee754sp x, 78 union ieee754sp y); 79 int ieee754sp_2008class(union ieee754sp x); 80 union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y); 81 union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y); 82 union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y); 83 union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y); 84 85 /* 86 * double precision (often aka double) 87 */ 88 int ieee754dp_class(union ieee754dp x); 89 90 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); 91 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); 92 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); 93 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); 94 95 union ieee754dp ieee754dp_abs(union ieee754dp x); 96 union ieee754dp ieee754dp_neg(union ieee754dp x); 97 98 union ieee754dp ieee754dp_fint(int x); 99 union ieee754dp ieee754dp_flong(s64 x); 100 union ieee754dp ieee754dp_fsp(union ieee754sp x); 101 union ieee754dp ieee754dp_rint(union ieee754dp x); 102 103 int ieee754dp_tint(union ieee754dp x); 104 s64 ieee754dp_tlong(union ieee754dp x); 105 106 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); 107 108 union ieee754dp ieee754dp_sqrt(union ieee754dp x); 109 110 union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, 111 union ieee754dp y); 112 union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, 113 union ieee754dp y); 114 union ieee754dp ieee754dp_madd(union ieee754dp z, union ieee754dp x, 115 union ieee754dp y); 116 union ieee754dp ieee754dp_msub(union ieee754dp z, union ieee754dp x, 117 union ieee754dp y); 118 union ieee754dp ieee754dp_nmadd(union ieee754dp z, union ieee754dp x, 119 union ieee754dp y); 120 union ieee754dp ieee754dp_nmsub(union ieee754dp z, union ieee754dp x, 121 union ieee754dp y); 122 int ieee754dp_2008class(union ieee754dp x); 123 union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y); 124 union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y); 125 union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y); 126 union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y); 127 128 129 /* 5 types of floating point number 130 */ 131 enum { 132 IEEE754_CLASS_NORM = 0x00, 133 IEEE754_CLASS_ZERO = 0x01, 134 IEEE754_CLASS_DNORM = 0x02, 135 IEEE754_CLASS_INF = 0x03, 136 IEEE754_CLASS_SNAN = 0x04, 137 IEEE754_CLASS_QNAN = 0x05, 138 }; 139 140 /* exception numbers */ 141 #define IEEE754_INEXACT 0x01 142 #define IEEE754_UNDERFLOW 0x02 143 #define IEEE754_OVERFLOW 0x04 144 #define IEEE754_ZERO_DIVIDE 0x08 145 #define IEEE754_INVALID_OPERATION 0x10 146 147 /* cmp operators 148 */ 149 #define IEEE754_CLT 0x01 150 #define IEEE754_CEQ 0x02 151 #define IEEE754_CGT 0x04 152 #define IEEE754_CUN 0x08 153 154 /* 155 * The control status register 156 */ 157 struct _ieee754_csr { 158 __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ 159 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ 160 __BITFIELD_FIELD(unsigned c:1, /* condition[0] */ 161 __BITFIELD_FIELD(unsigned pad0:3, 162 __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ 163 __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ 164 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ 165 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ 166 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ 167 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ 168 ;)))))))))) 169 }; 170 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 171 172 static inline unsigned int ieee754_getrm(void) 173 { 174 return (ieee754_csr.rm); 175 } 176 177 static inline unsigned int ieee754_setrm(unsigned int rm) 178 { 179 return (ieee754_csr.rm = rm); 180 } 181 182 /* 183 * get current exceptions 184 */ 185 static inline unsigned int ieee754_getcx(void) 186 { 187 return (ieee754_csr.cx); 188 } 189 190 /* test for current exception condition 191 */ 192 static inline int ieee754_cxtest(unsigned int n) 193 { 194 return (ieee754_csr.cx & n); 195 } 196 197 /* 198 * get sticky exceptions 199 */ 200 static inline unsigned int ieee754_getsx(void) 201 { 202 return (ieee754_csr.sx); 203 } 204 205 /* clear sticky conditions 206 */ 207 static inline unsigned int ieee754_clrsx(void) 208 { 209 return (ieee754_csr.sx = 0); 210 } 211 212 /* test for sticky exception condition 213 */ 214 static inline int ieee754_sxtest(unsigned int n) 215 { 216 return (ieee754_csr.sx & n); 217 } 218 219 /* debugging */ 220 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); 221 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); 222 223 #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ 224 #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ 225 #define IEEE754_SPCVAL_PONE 2 /* +1.0 */ 226 #define IEEE754_SPCVAL_NONE 3 /* -1.0 */ 227 #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ 228 #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ 229 #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ 230 #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ 231 #define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ 232 #define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ 233 #define IEEE754_SPCVAL_PMAX 10 /* +max norm */ 234 #define IEEE754_SPCVAL_NMAX 11 /* -max norm */ 235 #define IEEE754_SPCVAL_PMIN 12 /* +min norm */ 236 #define IEEE754_SPCVAL_NMIN 13 /* -min norm */ 237 #define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ 238 #define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ 239 #define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ 240 #define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ 241 242 extern const union ieee754dp __ieee754dp_spcvals[]; 243 extern const union ieee754sp __ieee754sp_spcvals[]; 244 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) 245 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) 246 247 /* 248 * Return infinity with given sign 249 */ 250 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 251 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 252 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 253 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 254 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ 255 ieee754_csr.nan2008]) 256 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 257 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 258 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 259 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) 260 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) 261 262 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 263 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 264 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 265 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 266 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ 267 ieee754_csr.nan2008]) 268 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 269 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 270 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 271 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) 272 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) 273 274 /* 275 * Indefinite integer value 276 */ 277 static inline int ieee754si_indef(void) 278 { 279 return ieee754_csr.nan2008 ? 0 : INT_MAX; 280 } 281 282 static inline s64 ieee754di_indef(void) 283 { 284 return ieee754_csr.nan2008 ? 0 : S64_MAX; 285 } 286 287 /* 288 * Overflow integer value 289 */ 290 static inline int ieee754si_overflow(int xs) 291 { 292 return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; 293 } 294 295 static inline s64 ieee754di_overflow(int xs) 296 { 297 return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; 298 } 299 300 /* result types for xctx.rt */ 301 #define IEEE754_RT_SP 0 302 #define IEEE754_RT_DP 1 303 #define IEEE754_RT_XP 2 304 #define IEEE754_RT_SI 3 305 #define IEEE754_RT_DI 4 306 307 /* compat */ 308 #define ieee754dp_fix(x) ieee754dp_tint(x) 309 #define ieee754sp_fix(x) ieee754sp_tint(x) 310 311 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ 312