softfloat.h revision 1.2
1 2 /* 3 =============================================================================== 4 5 This C header file is part of the SoftFloat IEC/IEEE Floating-point 6 Arithmetic Package, Release 2a. 7 8 Written by John R. Hauser. This work was made possible in part by the 9 International Computer Science Institute, located at Suite 600, 1947 Center 10 Street, Berkeley, California 94704. Funding was partially provided by the 11 National Science Foundation under grant MIP-9311980. The original version 12 of this code was written as part of a project to build a fixed-point vector 13 processor in collaboration with the University of California at Berkeley, 14 overseen by Profs. Nelson Morgan and John Wawrzynek. More information 15 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 16 arithmetic/SoftFloat.html'. 17 18 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 19 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 20 TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 21 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 22 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 23 24 Derivative works are acceptable, even for commercial purposes, so long as 25 (1) they include prominent notice that the work is derivative, and (2) they 26 include prominent notice akin to these four paragraphs for those parts of 27 this code that are retained. 28 29 =============================================================================== 30 */ 31 32 /* 33 ------------------------------------------------------------------------------- 34 The macro `FLOATX80' must be defined to enable the extended double-precision 35 floating-point format `floatx80'. If this macro is not defined, the 36 `floatx80' type will not be defined, and none of the functions that either 37 input or output the `floatx80' type will be defined. The same applies to 38 the `FLOAT128' macro and the quadruple-precision format `float128'. 39 ------------------------------------------------------------------------------- 40 */ 41 /* #define FLOATX80 */ 42 /* #define FLOAT128 */ 43 44 /* 45 ------------------------------------------------------------------------------- 46 Software IEC/IEEE floating-point types. 47 ------------------------------------------------------------------------------- 48 */ 49 typedef unsigned int float32; 50 typedef unsigned long long float64; 51 #ifdef FLOATX80 52 typedef struct { 53 unsigned short high; 54 unsigned long long low; 55 } floatx80; 56 #endif 57 #ifdef FLOAT128 58 typedef struct { 59 unsigned long long high, low; 60 } float128; 61 #endif 62 63 /* 64 ------------------------------------------------------------------------------- 65 Software IEC/IEEE floating-point underflow tininess-detection mode. 66 ------------------------------------------------------------------------------- 67 */ 68 extern int float_detect_tininess; 69 enum { 70 float_tininess_after_rounding = 0, 71 float_tininess_before_rounding = 1 72 }; 73 74 /* 75 ------------------------------------------------------------------------------- 76 Software IEC/IEEE floating-point rounding mode. 77 ------------------------------------------------------------------------------- 78 */ 79 extern int float_rounding_mode; 80 enum { 81 float_round_nearest_even = 0, 82 float_round_to_zero = 1, 83 float_round_down = 2, 84 float_round_up = 3 85 }; 86 87 /* 88 ------------------------------------------------------------------------------- 89 Software IEC/IEEE floating-point exception flags. 90 ------------------------------------------------------------------------------- 91 */ 92 extern int float_exception_flags; 93 enum { 94 float_flag_inexact = 1, 95 float_flag_underflow = 2, 96 float_flag_overflow = 4, 97 float_flag_divbyzero = 8, 98 float_flag_invalid = 16 99 }; 100 101 /* 102 ------------------------------------------------------------------------------- 103 Routine to raise any or all of the software IEC/IEEE floating-point 104 exception flags. 105 ------------------------------------------------------------------------------- 106 */ 107 void float_raise( int ); 108 109 /* 110 ------------------------------------------------------------------------------- 111 Software IEC/IEEE integer-to-floating-point conversion routines. 112 ------------------------------------------------------------------------------- 113 */ 114 float32 int32_to_float32( int ); 115 float64 int32_to_float64( int ); 116 #ifdef FLOATX80 117 floatx80 int32_to_floatx80( int ); 118 #endif 119 #ifdef FLOAT128 120 float128 int32_to_float128( int ); 121 #endif 122 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 123 float32 int64_to_float32( long long ); 124 float64 int64_to_float64( long long ); 125 #ifdef FLOATX80 126 floatx80 int64_to_floatx80( long long ); 127 #endif 128 #ifdef FLOAT128 129 float128 int64_to_float128( long long ); 130 #endif 131 #endif 132 133 /* 134 ------------------------------------------------------------------------------- 135 Software IEC/IEEE single-precision conversion routines. 136 ------------------------------------------------------------------------------- 137 */ 138 int float32_to_int32( float32 ); 139 int float32_to_int32_round_to_zero( float32 ); 140 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 141 long long float32_to_int64( float32 ); 142 long long float32_to_int64_round_to_zero( float32 ); 143 #endif 144 float64 float32_to_float64( float32 ); 145 #ifdef FLOATX80 146 floatx80 float32_to_floatx80( float32 ); 147 #endif 148 #ifdef FLOAT128 149 float128 float32_to_float128( float32 ); 150 #endif 151 152 /* 153 ------------------------------------------------------------------------------- 154 Software IEC/IEEE single-precision operations. 155 ------------------------------------------------------------------------------- 156 */ 157 float32 float32_round_to_int( float32 ); 158 float32 float32_add( float32, float32 ); 159 float32 float32_sub( float32, float32 ); 160 float32 float32_mul( float32, float32 ); 161 float32 float32_div( float32, float32 ); 162 float32 float32_rem( float32, float32 ); 163 float32 float32_sqrt( float32 ); 164 int float32_eq( float32, float32 ); 165 int float32_le( float32, float32 ); 166 int float32_lt( float32, float32 ); 167 int float32_eq_signaling( float32, float32 ); 168 int float32_le_quiet( float32, float32 ); 169 int float32_lt_quiet( float32, float32 ); 170 #ifndef SOFTFLOAT_FOR_GCC 171 int float32_is_signaling_nan( float32 ); 172 #endif 173 174 /* 175 ------------------------------------------------------------------------------- 176 Software IEC/IEEE double-precision conversion routines. 177 ------------------------------------------------------------------------------- 178 */ 179 int float64_to_int32( float64 ); 180 int float64_to_int32_round_to_zero( float64 ); 181 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 182 long long float64_to_int64( float64 ); 183 long long float64_to_int64_round_to_zero( float64 ); 184 #endif 185 float32 float64_to_float32( float64 ); 186 #ifdef FLOATX80 187 floatx80 float64_to_floatx80( float64 ); 188 #endif 189 #ifdef FLOAT128 190 float128 float64_to_float128( float64 ); 191 #endif 192 193 /* 194 ------------------------------------------------------------------------------- 195 Software IEC/IEEE double-precision operations. 196 ------------------------------------------------------------------------------- 197 */ 198 float64 float64_round_to_int( float64 ); 199 float64 float64_add( float64, float64 ); 200 float64 float64_sub( float64, float64 ); 201 float64 float64_mul( float64, float64 ); 202 float64 float64_div( float64, float64 ); 203 float64 float64_rem( float64, float64 ); 204 float64 float64_sqrt( float64 ); 205 int float64_eq( float64, float64 ); 206 int float64_le( float64, float64 ); 207 int float64_lt( float64, float64 ); 208 int float64_eq_signaling( float64, float64 ); 209 int float64_le_quiet( float64, float64 ); 210 int float64_lt_quiet( float64, float64 ); 211 #ifndef SOFTFLOAT_FOR_GCC 212 int float64_is_signaling_nan( float64 ); 213 #endif 214 215 #ifdef FLOATX80 216 217 /* 218 ------------------------------------------------------------------------------- 219 Software IEC/IEEE extended double-precision conversion routines. 220 ------------------------------------------------------------------------------- 221 */ 222 int floatx80_to_int32( floatx80 ); 223 int floatx80_to_int32_round_to_zero( floatx80 ); 224 long long floatx80_to_int64( floatx80 ); 225 long long floatx80_to_int64_round_to_zero( floatx80 ); 226 float32 floatx80_to_float32( floatx80 ); 227 float64 floatx80_to_float64( floatx80 ); 228 #ifdef FLOAT128 229 float128 floatx80_to_float128( floatx80 ); 230 #endif 231 232 /* 233 ------------------------------------------------------------------------------- 234 Software IEC/IEEE extended double-precision rounding precision. Valid 235 values are 32, 64, and 80. 236 ------------------------------------------------------------------------------- 237 */ 238 extern int floatx80_rounding_precision; 239 240 /* 241 ------------------------------------------------------------------------------- 242 Software IEC/IEEE extended double-precision operations. 243 ------------------------------------------------------------------------------- 244 */ 245 floatx80 floatx80_round_to_int( floatx80 ); 246 floatx80 floatx80_add( floatx80, floatx80 ); 247 floatx80 floatx80_sub( floatx80, floatx80 ); 248 floatx80 floatx80_mul( floatx80, floatx80 ); 249 floatx80 floatx80_div( floatx80, floatx80 ); 250 floatx80 floatx80_rem( floatx80, floatx80 ); 251 floatx80 floatx80_sqrt( floatx80 ); 252 int floatx80_eq( floatx80, floatx80 ); 253 int floatx80_le( floatx80, floatx80 ); 254 int floatx80_lt( floatx80, floatx80 ); 255 int floatx80_eq_signaling( floatx80, floatx80 ); 256 int floatx80_le_quiet( floatx80, floatx80 ); 257 int floatx80_lt_quiet( floatx80, floatx80 ); 258 int floatx80_is_signaling_nan( floatx80 ); 259 260 #endif 261 262 #ifdef FLOAT128 263 264 /* 265 ------------------------------------------------------------------------------- 266 Software IEC/IEEE quadruple-precision conversion routines. 267 ------------------------------------------------------------------------------- 268 */ 269 int float128_to_int32( float128 ); 270 int float128_to_int32_round_to_zero( float128 ); 271 long long float128_to_int64( float128 ); 272 long long float128_to_int64_round_to_zero( float128 ); 273 float32 float128_to_float32( float128 ); 274 float64 float128_to_float64( float128 ); 275 #ifdef FLOATX80 276 floatx80 float128_to_floatx80( float128 ); 277 #endif 278 279 /* 280 ------------------------------------------------------------------------------- 281 Software IEC/IEEE quadruple-precision operations. 282 ------------------------------------------------------------------------------- 283 */ 284 float128 float128_round_to_int( float128 ); 285 float128 float128_add( float128, float128 ); 286 float128 float128_sub( float128, float128 ); 287 float128 float128_mul( float128, float128 ); 288 float128 float128_div( float128, float128 ); 289 float128 float128_rem( float128, float128 ); 290 float128 float128_sqrt( float128 ); 291 int float128_eq( float128, float128 ); 292 int float128_le( float128, float128 ); 293 int float128_lt( float128, float128 ); 294 int float128_eq_signaling( float128, float128 ); 295 int float128_le_quiet( float128, float128 ); 296 int float128_lt_quiet( float128, float128 ); 297 int float128_is_signaling_nan( float128 ); 298 299 #endif 300 301
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