softfloat.h revision 1.2
1 /* $NetBSD: softfloat.h,v 1.2 2000/07/15 13:26:51 bjh21 Exp $ */ 2 3 /* 4 =============================================================================== 5 6 This C header file is part of the SoftFloat IEC/IEEE Floating-point 7 Arithmetic Package, Release 2a. 8 9 Written by John R. Hauser. This work was made possible in part by the 10 International Computer Science Institute, located at Suite 600, 1947 Center 11 Street, Berkeley, California 94704. Funding was partially provided by the 12 National Science Foundation under grant MIP-9311980. The original version 13 of this code was written as part of a project to build a fixed-point vector 14 processor in collaboration with the University of California at Berkeley, 15 overseen by Profs. Nelson Morgan and John Wawrzynek. More information 16 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 17 arithmetic/SoftFloat.html'. 18 19 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 20 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 21 TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 22 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 23 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 24 25 Derivative works are acceptable, even for commercial purposes, so long as 26 (1) they include prominent notice that the work is derivative, and (2) they 27 include prominent notice akin to these four paragraphs for those parts of 28 this code that are retained. 29 30 =============================================================================== 31 */ 32 33 /* 34 ------------------------------------------------------------------------------- 35 The macro `FLOATX80' must be defined to enable the extended double-precision 36 floating-point format `floatx80'. If this macro is not defined, the 37 `floatx80' type will not be defined, and none of the functions that either 38 input or output the `floatx80' type will be defined. The same applies to 39 the `FLOAT128' macro and the quadruple-precision format `float128'. 40 ------------------------------------------------------------------------------- 41 */ 42 /* #define FLOATX80 */ 43 /* #define FLOAT128 */ 44 45 #include <machine/ieeefp.h> 46 47 /* 48 ------------------------------------------------------------------------------- 49 Software IEC/IEEE floating-point types. 50 ------------------------------------------------------------------------------- 51 */ 52 typedef unsigned int float32; 53 typedef unsigned long long float64; 54 #ifdef FLOATX80 55 typedef struct { 56 unsigned short high; 57 unsigned long long low; 58 } floatx80; 59 #endif 60 #ifdef FLOAT128 61 typedef struct { 62 unsigned long long high, low; 63 } float128; 64 #endif 65 66 /* 67 ------------------------------------------------------------------------------- 68 Software IEC/IEEE floating-point underflow tininess-detection mode. 69 ------------------------------------------------------------------------------- 70 */ 71 extern int8 float_detect_tininess; 72 enum { 73 float_tininess_after_rounding = 0, 74 float_tininess_before_rounding = 1 75 }; 76 77 /* 78 ------------------------------------------------------------------------------- 79 Software IEC/IEEE floating-point rounding mode. 80 ------------------------------------------------------------------------------- 81 */ 82 extern int8 float_rounding_mode; 83 enum { 84 float_round_nearest_even = FP_RN, 85 float_round_to_zero = FP_RZ, 86 float_round_down = FP_RM, 87 float_round_up = FP_RP 88 }; 89 90 /* 91 ------------------------------------------------------------------------------- 92 Software IEC/IEEE floating-point exception flags. 93 ------------------------------------------------------------------------------- 94 */ 95 extern int8 float_exception_flags; 96 enum { 97 float_flag_inexact = FP_X_IMP, 98 float_flag_underflow = FP_X_UFL, 99 float_flag_overflow = FP_X_OFL, 100 float_flag_divbyzero = FP_X_DZ, 101 float_flag_invalid = FP_X_INV 102 }; 103 104 /* 105 ------------------------------------------------------------------------------- 106 Routine to raise any or all of the software IEC/IEEE floating-point 107 exception flags. 108 ------------------------------------------------------------------------------- 109 */ 110 void float_raise( int8 ); 111 112 /* 113 ------------------------------------------------------------------------------- 114 Software IEC/IEEE integer-to-floating-point conversion routines. 115 ------------------------------------------------------------------------------- 116 */ 117 float32 int32_to_float32( int ); 118 float64 int32_to_float64( int ); 119 #ifdef FLOATX80 120 floatx80 int32_to_floatx80( int ); 121 #endif 122 #ifdef FLOAT128 123 float128 int32_to_float128( int ); 124 #endif 125 float32 int64_to_float32( long long ); 126 float64 int64_to_float64( long long ); 127 #ifdef FLOATX80 128 floatx80 int64_to_floatx80( long long ); 129 #endif 130 #ifdef FLOAT128 131 float128 int64_to_float128( long long ); 132 #endif 133 134 /* 135 ------------------------------------------------------------------------------- 136 Software IEC/IEEE single-precision conversion routines. 137 ------------------------------------------------------------------------------- 138 */ 139 int float32_to_int32( float32 ); 140 int float32_to_int32_round_to_zero( float32 ); 141 #if defined(SOFTFLOAT_FOR_GCC) && !__GNUC_PREREQ__(2,95) 142 unsigned int float32_to_uint32_round_to_zero( float32 ); 143 #endif 144 long long float32_to_int64( float32 ); 145 long long float32_to_int64_round_to_zero( float32 ); 146 float64 float32_to_float64( float32 ); 147 #ifdef FLOATX80 148 floatx80 float32_to_floatx80( float32 ); 149 #endif 150 #ifdef FLOAT128 151 float128 float32_to_float128( float32 ); 152 #endif 153 154 /* 155 ------------------------------------------------------------------------------- 156 Software IEC/IEEE single-precision operations. 157 ------------------------------------------------------------------------------- 158 */ 159 float32 float32_round_to_int( float32 ); 160 float32 float32_add( float32, float32 ); 161 float32 float32_sub( float32, float32 ); 162 float32 float32_mul( float32, float32 ); 163 float32 float32_div( float32, float32 ); 164 float32 float32_rem( float32, float32 ); 165 float32 float32_sqrt( float32 ); 166 flag float32_eq( float32, float32 ); 167 flag float32_le( float32, float32 ); 168 flag float32_lt( float32, float32 ); 169 flag float32_eq_signaling( float32, float32 ); 170 flag float32_le_quiet( float32, float32 ); 171 flag float32_lt_quiet( float32, float32 ); 172 #ifndef SOFTFLOAT_FOR_GCC 173 flags float32_is_signaling_nan( float32 ); 174 #endif 175 176 /* 177 ------------------------------------------------------------------------------- 178 Software IEC/IEEE double-precision conversion routines. 179 ------------------------------------------------------------------------------- 180 */ 181 int float64_to_int32( float64 ); 182 int float64_to_int32_round_to_zero( float64 ); 183 #if defined(SOFTFLOAT_FOR_GCC) && !__GNUC_PREREQ__(2,95) 184 unsigned int float64_to_uint32_round_to_zero( float64 ); 185 #endif 186 long long float64_to_int64( float64 ); 187 long long float64_to_int64_round_to_zero( float64 ); 188 float32 float64_to_float32( float64 ); 189 #ifdef FLOATX80 190 floatx80 float64_to_floatx80( float64 ); 191 #endif 192 #ifdef FLOAT128 193 float128 float64_to_float128( float64 ); 194 #endif 195 196 /* 197 ------------------------------------------------------------------------------- 198 Software IEC/IEEE double-precision operations. 199 ------------------------------------------------------------------------------- 200 */ 201 float64 float64_round_to_int( float64 ); 202 float64 float64_add( float64, float64 ); 203 float64 float64_sub( float64, float64 ); 204 float64 float64_mul( float64, float64 ); 205 float64 float64_div( float64, float64 ); 206 float64 float64_rem( float64, float64 ); 207 float64 float64_sqrt( float64 ); 208 flag float64_eq( float64, float64 ); 209 flag float64_le( float64, float64 ); 210 flag float64_lt( float64, float64 ); 211 flag float64_eq_signaling( float64, float64 ); 212 flag float64_le_quiet( float64, float64 ); 213 flag float64_lt_quiet( float64, float64 ); 214 #ifndef SOFTFLOAT_FOR_GCC 215 flags float64_is_signaling_nan( float64 ); 216 #endif 217 218 #ifdef FLOATX80 219 220 /* 221 ------------------------------------------------------------------------------- 222 Software IEC/IEEE extended double-precision conversion routines. 223 ------------------------------------------------------------------------------- 224 */ 225 int floatx80_to_int32( floatx80 ); 226 int floatx80_to_int32_round_to_zero( floatx80 ); 227 long long floatx80_to_int64( floatx80 ); 228 long long floatx80_to_int64_round_to_zero( floatx80 ); 229 float32 floatx80_to_float32( floatx80 ); 230 float64 floatx80_to_float64( floatx80 ); 231 #ifdef FLOAT128 232 float128 floatx80_to_float128( floatx80 ); 233 #endif 234 235 /* 236 ------------------------------------------------------------------------------- 237 Software IEC/IEEE extended double-precision rounding precision. Valid 238 values are 32, 64, and 80. 239 ------------------------------------------------------------------------------- 240 */ 241 extern int floatx80_rounding_precision; 242 243 /* 244 ------------------------------------------------------------------------------- 245 Software IEC/IEEE extended double-precision operations. 246 ------------------------------------------------------------------------------- 247 */ 248 floatx80 floatx80_round_to_int( floatx80 ); 249 floatx80 floatx80_add( floatx80, floatx80 ); 250 floatx80 floatx80_sub( floatx80, floatx80 ); 251 floatx80 floatx80_mul( floatx80, floatx80 ); 252 floatx80 floatx80_div( floatx80, floatx80 ); 253 floatx80 floatx80_rem( floatx80, floatx80 ); 254 floatx80 floatx80_sqrt( floatx80 ); 255 flag floatx80_eq( floatx80, floatx80 ); 256 flag floatx80_le( floatx80, floatx80 ); 257 flag floatx80_lt( floatx80, floatx80 ); 258 flag floatx80_eq_signaling( floatx80, floatx80 ); 259 flag floatx80_le_quiet( floatx80, floatx80 ); 260 flag floatx80_lt_quiet( floatx80, floatx80 ); 261 flag floatx80_is_signaling_nan( floatx80 ); 262 263 #endif 264 265 #ifdef FLOAT128 266 267 /* 268 ------------------------------------------------------------------------------- 269 Software IEC/IEEE quadruple-precision conversion routines. 270 ------------------------------------------------------------------------------- 271 */ 272 int float128_to_int32( float128 ); 273 int float128_to_int32_round_to_zero( float128 ); 274 long long float128_to_int64( float128 ); 275 long long float128_to_int64_round_to_zero( float128 ); 276 float32 float128_to_float32( float128 ); 277 float64 float128_to_float64( float128 ); 278 #ifdef FLOATX80 279 floatx80 float128_to_floatx80( float128 ); 280 #endif 281 282 /* 283 ------------------------------------------------------------------------------- 284 Software IEC/IEEE quadruple-precision operations. 285 ------------------------------------------------------------------------------- 286 */ 287 float128 float128_round_to_int( float128 ); 288 float128 float128_add( float128, float128 ); 289 float128 float128_sub( float128, float128 ); 290 float128 float128_mul( float128, float128 ); 291 float128 float128_div( float128, float128 ); 292 float128 float128_rem( float128, float128 ); 293 float128 float128_sqrt( float128 ); 294 flag float128_eq( float128, float128 ); 295 flag float128_le( float128, float128 ); 296 flag float128_lt( float128, float128 ); 297 flag float128_eq_signaling( float128, float128 ); 298 flag float128_le_quiet( float128, float128 ); 299 flag float128_lt_quiet( float128, float128 ); 300 flag float128_is_signaling_nan( float128 ); 301 302 #endif 303 304
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