1 /* $NetBSD: softfloat.h,v 1.2 2018/12/06 19:17:13 tih Exp $ */ 2 3 /* This is a derivative work. */ 4 5 /* 6 =============================================================================== 7 8 This C header file is part of the SoftFloat IEC/IEEE Floating-point 9 Arithmetic Package, Release 2a. 10 11 Written by John R. Hauser. This work was made possible in part by the 12 International Computer Science Institute, located at Suite 600, 1947 Center 13 Street, Berkeley, California 94704. Funding was partially provided by the 14 National Science Foundation under grant MIP-9311980. The original version 15 of this code was written as part of a project to build a fixed-point vector 16 processor in collaboration with the University of California at Berkeley, 17 overseen by Profs. Nelson Morgan and John Wawrzynek. More information 18 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 19 arithmetic/SoftFloat.html'. 20 21 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 22 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 23 TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 24 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 25 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 26 27 Derivative works are acceptable, even for commercial purposes, so long as 28 (1) they include prominent notice that the work is derivative, and (2) they 29 include prominent notice akin to these four paragraphs for those parts of 30 this code that are retained. 31 32 =============================================================================== 33 */ 34 35 /* 36 ------------------------------------------------------------------------------- 37 The macro `FLOATX80' must be defined to enable the extended double-precision 38 floating-point format `floatx80'. If this macro is not defined, the 39 `floatx80' type will not be defined, and none of the functions that either 40 input or output the `floatx80' type will be defined. The same applies to 41 the `FLOAT128' macro and the quadruple-precision format `float128'. 42 ------------------------------------------------------------------------------- 43 */ 44 /* #define FLOATX80 */ 45 #define FLOAT128 46 47 #include "softfloat-qp.h" 48 49 #include <sys/endian.h> 50 #include <machine/ieeefp.h> 51 52 /* 53 ------------------------------------------------------------------------------- 54 Software IEC/IEEE floating-point types. 55 ------------------------------------------------------------------------------- 56 */ 57 typedef unsigned int float32; 58 typedef unsigned long long float64; 59 #ifdef FLOATX80 60 typedef struct { 61 unsigned short high; 62 unsigned long long low; 63 } floatx80; 64 #endif 65 #ifdef FLOAT128 66 typedef struct { 67 #if _BYTE_ORDER == _BIG_ENDIAN 68 unsigned long long high, low; 69 #else 70 unsigned long long low, high; 71 #endif 72 } float128; 73 #endif 74 75 /* 76 ------------------------------------------------------------------------------- 77 Software IEC/IEEE floating-point underflow tininess-detection mode. 78 ------------------------------------------------------------------------------- 79 */ 80 #ifndef SOFTFLOAT_FOR_GCC 81 extern int8 float_detect_tininess; 82 #endif 83 enum { 84 float_tininess_after_rounding = 0, 85 float_tininess_before_rounding = 1 86 }; 87 88 /* 89 ------------------------------------------------------------------------------- 90 Software IEC/IEEE floating-point rounding mode. 91 ------------------------------------------------------------------------------- 92 */ 93 extern fp_rnd float_rounding_mode; 94 #define float_round_nearest_even FP_RN 95 #define float_round_to_zero FP_RZ 96 #define float_round_down FP_RM 97 #define float_round_up FP_RP 98 99 /* 100 ------------------------------------------------------------------------------- 101 Software IEC/IEEE floating-point exception flags. 102 ------------------------------------------------------------------------------- 103 */ 104 extern fp_except float_exception_flags; 105 extern fp_except float_exception_mask; 106 enum { 107 float_flag_inexact = FP_X_IMP, 108 float_flag_underflow = FP_X_UFL, 109 float_flag_overflow = FP_X_OFL, 110 float_flag_divbyzero = FP_X_DZ, 111 float_flag_invalid = FP_X_INV 112 }; 113 114 /* 115 ------------------------------------------------------------------------------- 116 Routine to raise any or all of the software IEC/IEEE floating-point 117 exception flags. 118 ------------------------------------------------------------------------------- 119 */ 120 void float_raise( fp_except ); 121 122 /* 123 ------------------------------------------------------------------------------- 124 Software IEC/IEEE integer-to-floating-point conversion routines. 125 ------------------------------------------------------------------------------- 126 */ 127 float32 int32_to_float32( int32 ); 128 float32 uint32_to_float32( uint32 ); 129 float64 int32_to_float64( int32 ); 130 float64 uint32_to_float64( uint32 ); 131 #ifdef FLOATX80 132 floatx80 int32_to_floatx80( int32 ); 133 floatx80 uint32_to_floatx80( uint32 ); 134 #endif 135 #ifdef FLOAT128 136 float128 int32_to_float128( int32 ); 137 float128 uint32_to_float128( uint32 ); 138 #endif 139 float32 int64_to_float32( long long ); 140 float64 int64_to_float64( long long ); 141 #ifdef FLOATX80 142 floatx80 int64_to_floatx80( long long ); 143 #endif 144 #ifdef FLOAT128 145 float128 int64_to_float128( long long ); 146 #endif 147 148 /* 149 ------------------------------------------------------------------------------- 150 Software IEC/IEEE single-precision conversion routines. 151 ------------------------------------------------------------------------------- 152 */ 153 int float32_to_int32( float32 ); 154 int float32_to_int32_round_to_zero( float32 ); 155 unsigned int float32_to_uint32_round_to_zero( float32 ); 156 long long float32_to_int64( float32 ); 157 long long float32_to_int64_round_to_zero( float32 ); 158 float64 float32_to_float64( float32 ); 159 #ifdef FLOATX80 160 floatx80 float32_to_floatx80( float32 ); 161 #endif 162 #ifdef FLOAT128 163 float128 float32_to_float128( float32 ); 164 #endif 165 166 /* 167 ------------------------------------------------------------------------------- 168 Software IEC/IEEE single-precision operations. 169 ------------------------------------------------------------------------------- 170 */ 171 float32 float32_round_to_int( float32 ); 172 float32 float32_add( float32, float32 ); 173 float32 float32_sub( float32, float32 ); 174 float32 float32_mul( float32, float32 ); 175 float32 float32_div( float32, float32 ); 176 float32 float32_rem( float32, float32 ); 177 float32 float32_sqrt( float32 ); 178 flag float32_eq( float32, float32 ); 179 flag float32_le( float32, float32 ); 180 flag float32_lt( float32, float32 ); 181 flag float32_eq_signaling( float32, float32 ); 182 flag float32_le_quiet( float32, float32 ); 183 flag float32_lt_quiet( float32, float32 ); 184 flag float32_is_signaling_nan( float32 ); 185 186 /* 187 ------------------------------------------------------------------------------- 188 Software IEC/IEEE double-precision conversion routines. 189 ------------------------------------------------------------------------------- 190 */ 191 int float64_to_int32( float64 ); 192 int float64_to_int32_round_to_zero( float64 ); 193 unsigned int float64_to_uint32_round_to_zero( float64 ); 194 long long float64_to_int64( float64 ); 195 long long float64_to_int64_round_to_zero( float64 ); 196 float32 float64_to_float32( float64 ); 197 #ifdef FLOATX80 198 floatx80 float64_to_floatx80( float64 ); 199 #endif 200 #ifdef FLOAT128 201 float128 float64_to_float128( float64 ); 202 #endif 203 204 /* 205 ------------------------------------------------------------------------------- 206 Software IEC/IEEE double-precision operations. 207 ------------------------------------------------------------------------------- 208 */ 209 float64 float64_round_to_int( float64 ); 210 float64 float64_add( float64, float64 ); 211 float64 float64_sub( float64, float64 ); 212 float64 float64_mul( float64, float64 ); 213 float64 float64_div( float64, float64 ); 214 float64 float64_rem( float64, float64 ); 215 float64 float64_sqrt( float64 ); 216 flag float64_eq( float64, float64 ); 217 flag float64_le( float64, float64 ); 218 flag float64_lt( float64, float64 ); 219 flag float64_eq_signaling( float64, float64 ); 220 flag float64_le_quiet( float64, float64 ); 221 flag float64_lt_quiet( float64, float64 ); 222 flag float64_is_signaling_nan( float64 ); 223 224 #ifdef FLOATX80 225 226 /* 227 ------------------------------------------------------------------------------- 228 Software IEC/IEEE extended double-precision conversion routines. 229 ------------------------------------------------------------------------------- 230 */ 231 int floatx80_to_int32( floatx80 ); 232 int floatx80_to_int32_round_to_zero( floatx80 ); 233 long long floatx80_to_int64( floatx80 ); 234 long long floatx80_to_int64_round_to_zero( floatx80 ); 235 float32 floatx80_to_float32( floatx80 ); 236 float64 floatx80_to_float64( floatx80 ); 237 #ifdef FLOAT128 238 float128 floatx80_to_float128( floatx80 ); 239 #endif 240 241 /* 242 ------------------------------------------------------------------------------- 243 Software IEC/IEEE extended double-precision rounding precision. Valid 244 values are 32, 64, and 80. 245 ------------------------------------------------------------------------------- 246 */ 247 extern int floatx80_rounding_precision; 248 249 /* 250 ------------------------------------------------------------------------------- 251 Software IEC/IEEE extended double-precision operations. 252 ------------------------------------------------------------------------------- 253 */ 254 floatx80 floatx80_round_to_int( floatx80 ); 255 floatx80 floatx80_add( floatx80, floatx80 ); 256 floatx80 floatx80_sub( floatx80, floatx80 ); 257 floatx80 floatx80_mul( floatx80, floatx80 ); 258 floatx80 floatx80_div( floatx80, floatx80 ); 259 floatx80 floatx80_rem( floatx80, floatx80 ); 260 floatx80 floatx80_sqrt( floatx80 ); 261 flag floatx80_eq( floatx80, floatx80 ); 262 flag floatx80_le( floatx80, floatx80 ); 263 flag floatx80_lt( floatx80, floatx80 ); 264 flag floatx80_eq_signaling( floatx80, floatx80 ); 265 flag floatx80_le_quiet( floatx80, floatx80 ); 266 flag floatx80_lt_quiet( floatx80, floatx80 ); 267 flag floatx80_is_signaling_nan( floatx80 ); 268 269 #endif 270 271 #ifdef FLOAT128 272 273 /* 274 ------------------------------------------------------------------------------- 275 Software IEC/IEEE quadruple-precision conversion routines. 276 ------------------------------------------------------------------------------- 277 */ 278 int float128_to_int32( float128 ); 279 int float128_to_int32_round_to_zero( float128 ); 280 long long float128_to_int64( float128 ); 281 long long float128_to_int64_round_to_zero( float128 ); 282 unsigned long long float128_to_uint64_round_to_zero( float128 ); 283 float32 float128_to_float32( float128 ); 284 float64 float128_to_float64( float128 ); 285 #ifdef FLOATX80 286 floatx80 float128_to_floatx80( float128 ); 287 #endif 288 289 /* 290 ------------------------------------------------------------------------------- 291 Software IEC/IEEE quadruple-precision operations. 292 ------------------------------------------------------------------------------- 293 */ 294 float128 float128_round_to_int( float128 ); 295 float128 float128_add( float128, float128 ); 296 float128 float128_sub( float128, float128 ); 297 float128 float128_mul( float128, float128 ); 298 float128 float128_div( float128, float128 ); 299 float128 float128_rem( float128, float128 ); 300 float128 float128_sqrt( float128 ); 301 flag float128_eq( float128, float128 ); 302 flag float128_le( float128, float128 ); 303 flag float128_lt( float128, float128 ); 304 flag float128_eq_signaling( float128, float128 ); 305 flag float128_le_quiet( float128, float128 ); 306 flag float128_lt_quiet( float128, float128 ); 307 flag float128_is_signaling_nan( float128 ); 308 flag float128_is_nan( float128 ); 309 310 #endif 311
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