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 int ieee754sp_2008class(union ieee754sp x); 72 union ieee754sp ieee754sp_fmin(union ieee754sp x, union ieee754sp y); 73 union ieee754sp ieee754sp_fmina(union ieee754sp x, union ieee754sp y); 74 union ieee754sp ieee754sp_fmax(union ieee754sp x, union ieee754sp y); 75 union ieee754sp ieee754sp_fmaxa(union ieee754sp x, union ieee754sp y); 76 77 /* 78 * double precision (often aka double) 79 */ 80 int ieee754dp_class(union ieee754dp x); 81 82 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); 83 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); 84 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); 85 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); 86 87 union ieee754dp ieee754dp_abs(union ieee754dp x); 88 union ieee754dp ieee754dp_neg(union ieee754dp x); 89 90 union ieee754dp ieee754dp_fint(int x); 91 union ieee754dp ieee754dp_flong(s64 x); 92 union ieee754dp ieee754dp_fsp(union ieee754sp x); 93 union ieee754dp ieee754dp_rint(union ieee754dp 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 union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, 103 union ieee754dp y); 104 union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, 105 union ieee754dp y); 106 int ieee754dp_2008class(union ieee754dp x); 107 union ieee754dp ieee754dp_fmin(union ieee754dp x, union ieee754dp y); 108 union ieee754dp ieee754dp_fmina(union ieee754dp x, union ieee754dp y); 109 union ieee754dp ieee754dp_fmax(union ieee754dp x, union ieee754dp y); 110 union ieee754dp ieee754dp_fmaxa(union ieee754dp x, union ieee754dp y); 111 112 113 /* 5 types of floating point number 114 */ 115 enum { 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, 122 }; 123 124 /* 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 130 131 /* cmp operators 132 */ 133 #define IEEE754_CLT 0x01 134 #define IEEE754_CEQ 0x02 135 #define IEEE754_CGT 0x04 136 #define IEEE754_CUN 0x08 137 138 /* 139 * The control status register 140 */ 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 */ 152 ;)))))))))) 153 }; 154 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 155 156 static inline unsigned int ieee754_getrm(void) 157 { 158 return (ieee754_csr.rm); 159 } 160 161 static inline unsigned int ieee754_setrm(unsigned int rm) 162 { 163 return (ieee754_csr.rm = rm); 164 } 165 166 /* 167 * get current exceptions 168 */ 169 static inline unsigned int ieee754_getcx(void) 170 { 171 return (ieee754_csr.cx); 172 } 173 174 /* test for current exception condition 175 */ 176 static inline int ieee754_cxtest(unsigned int n) 177 { 178 return (ieee754_csr.cx & n); 179 } 180 181 /* 182 * get sticky exceptions 183 */ 184 static inline unsigned int ieee754_getsx(void) 185 { 186 return (ieee754_csr.sx); 187 } 188 189 /* clear sticky conditions 190 */ 191 static inline unsigned int ieee754_clrsx(void) 192 { 193 return (ieee754_csr.sx = 0); 194 } 195 196 /* test for sticky exception condition 197 */ 198 static inline int ieee754_sxtest(unsigned int n) 199 { 200 return (ieee754_csr.sx & n); 201 } 202 203 /* debugging */ 204 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); 205 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); 206 207 #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ 208 #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ 209 #define IEEE754_SPCVAL_PONE 2 /* +1.0 */ 210 #define IEEE754_SPCVAL_NONE 3 /* -1.0 */ 211 #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ 212 #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ 213 #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ 214 #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ 215 #define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ 216 #define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ 217 #define IEEE754_SPCVAL_PMAX 10 /* +max norm */ 218 #define IEEE754_SPCVAL_NMAX 11 /* -max norm */ 219 #define IEEE754_SPCVAL_PMIN 12 /* +min norm */ 220 #define IEEE754_SPCVAL_NMIN 13 /* -min norm */ 221 #define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ 222 #define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ 223 #define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ 224 #define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ 225 226 extern const union ieee754dp __ieee754dp_spcvals[]; 227 extern const union ieee754sp __ieee754sp_spcvals[]; 228 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) 229 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) 230 231 /* 232 * Return infinity with given sign 233 */ 234 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 235 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 236 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 237 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 238 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ 239 ieee754_csr.nan2008]) 240 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 241 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 242 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 243 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) 244 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) 245 246 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 247 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 248 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 249 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 250 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ 251 ieee754_csr.nan2008]) 252 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 253 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 254 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 255 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) 256 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) 257 258 /* 259 * Indefinite integer value 260 */ 261 static inline int ieee754si_indef(void) 262 { 263 return ieee754_csr.nan2008 ? 0 : INT_MAX; 264 } 265 266 static inline s64 ieee754di_indef(void) 267 { 268 return ieee754_csr.nan2008 ? 0 : S64_MAX; 269 } 270 271 /* 272 * Overflow integer value 273 */ 274 static inline int ieee754si_overflow(int xs) 275 { 276 return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; 277 } 278 279 static inline s64 ieee754di_overflow(int xs) 280 { 281 return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; 282 } 283 284 /* result types for xctx.rt */ 285 #define IEEE754_RT_SP 0 286 #define IEEE754_RT_DP 1 287 #define IEEE754_RT_XP 2 288 #define IEEE754_RT_SI 3 289 #define IEEE754_RT_DI 4 290 291 /* compat */ 292 #define ieee754dp_fix(x) ieee754dp_tint(x) 293 #define ieee754sp_fix(x) ieee754sp_tint(x) 294 295 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ 296