softfloat.h revision 1.5
1 /* $NetBSD: softfloat.h,v 1.5 2006/05/16 20:55:51 mrg 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 <machine/ieeefp.h> 48 49 /* 50 ------------------------------------------------------------------------------- 51 Software IEC/IEEE floating-point types. 52 ------------------------------------------------------------------------------- 53 */ 54 typedef unsigned int float32; 55 typedef unsigned long long float64; 56 #ifdef FLOATX80 57 typedef struct { 58 unsigned short high; 59 unsigned long long low; 60 } floatx80; 61 #endif 62 #ifdef FLOAT128 63 typedef struct { 64 unsigned long long high, low; 65 } float128; 66 #endif 67 68 /* 69 ------------------------------------------------------------------------------- 70 Software IEC/IEEE floating-point underflow tininess-detection mode. 71 ------------------------------------------------------------------------------- 72 */ 73 #ifndef SOFTFLOAT_FOR_GCC 74 extern int8 float_detect_tininess; 75 #endif 76 enum { 77 float_tininess_after_rounding = 0, 78 float_tininess_before_rounding = 1 79 }; 80 81 /* 82 ------------------------------------------------------------------------------- 83 Software IEC/IEEE floating-point rounding mode. 84 ------------------------------------------------------------------------------- 85 */ 86 extern fp_rnd float_rounding_mode; 87 enum { 88 float_round_nearest_even = FP_RN, 89 float_round_to_zero = FP_RZ, 90 float_round_down = FP_RM, 91 float_round_up = FP_RP 92 }; 93 94 /* 95 ------------------------------------------------------------------------------- 96 Software IEC/IEEE floating-point exception flags. 97 ------------------------------------------------------------------------------- 98 */ 99 extern fp_except float_exception_flags; 100 extern fp_except float_exception_mask; 101 enum { 102 float_flag_inexact = FP_X_IMP, 103 float_flag_underflow = FP_X_UFL, 104 float_flag_overflow = FP_X_OFL, 105 float_flag_divbyzero = FP_X_DZ, 106 float_flag_invalid = FP_X_INV 107 }; 108 109 /* 110 ------------------------------------------------------------------------------- 111 Routine to raise any or all of the software IEC/IEEE floating-point 112 exception flags. 113 ------------------------------------------------------------------------------- 114 */ 115 void float_raise( fp_except ); 116 117 /* 118 ------------------------------------------------------------------------------- 119 Software IEC/IEEE integer-to-floating-point conversion routines. 120 ------------------------------------------------------------------------------- 121 */ 122 float32 int32_to_float32( int ); 123 float64 int32_to_float64( int ); 124 #ifdef FLOATX80 125 floatx80 int32_to_floatx80( int ); 126 #endif 127 #ifdef FLOAT128 128 float128 int32_to_float128( int ); 129 #endif 130 float32 int64_to_float32( long long ); 131 float64 int64_to_float64( long long ); 132 #ifdef FLOATX80 133 floatx80 int64_to_floatx80( long long ); 134 #endif 135 #ifdef FLOAT128 136 float128 int64_to_float128( long long ); 137 #endif 138 139 /* 140 ------------------------------------------------------------------------------- 141 Software IEC/IEEE single-precision conversion routines. 142 ------------------------------------------------------------------------------- 143 */ 144 int float32_to_int32( float32 ); 145 int float32_to_int32_round_to_zero( float32 ); 146 unsigned int float32_to_uint32_round_to_zero( float32 ); 147 long long float32_to_int64( float32 ); 148 long long float32_to_int64_round_to_zero( float32 ); 149 float64 float32_to_float64( float32 ); 150 #ifdef FLOATX80 151 floatx80 float32_to_floatx80( float32 ); 152 #endif 153 #ifdef FLOAT128 154 float128 float32_to_float128( float32 ); 155 #endif 156 157 /* 158 ------------------------------------------------------------------------------- 159 Software IEC/IEEE single-precision operations. 160 ------------------------------------------------------------------------------- 161 */ 162 float32 float32_round_to_int( float32 ); 163 float32 float32_add( float32, float32 ); 164 float32 float32_sub( float32, float32 ); 165 float32 float32_mul( float32, float32 ); 166 float32 float32_div( float32, float32 ); 167 float32 float32_rem( float32, float32 ); 168 float32 float32_sqrt( float32 ); 169 flag float32_eq( float32, float32 ); 170 flag float32_le( float32, float32 ); 171 flag float32_lt( float32, float32 ); 172 flag float32_eq_signaling( float32, float32 ); 173 flag float32_le_quiet( float32, float32 ); 174 flag float32_lt_quiet( float32, float32 ); 175 #ifndef SOFTFLOAT_FOR_GCC 176 flag float32_is_signaling_nan( float32 ); 177 #endif 178 179 /* 180 ------------------------------------------------------------------------------- 181 Software IEC/IEEE double-precision conversion routines. 182 ------------------------------------------------------------------------------- 183 */ 184 int float64_to_int32( float64 ); 185 int float64_to_int32_round_to_zero( float64 ); 186 unsigned int float64_to_uint32_round_to_zero( float64 ); 187 long long float64_to_int64( float64 ); 188 long long float64_to_int64_round_to_zero( float64 ); 189 float32 float64_to_float32( float64 ); 190 #ifdef FLOATX80 191 floatx80 float64_to_floatx80( float64 ); 192 #endif 193 #ifdef FLOAT128 194 float128 float64_to_float128( float64 ); 195 #endif 196 197 /* 198 ------------------------------------------------------------------------------- 199 Software IEC/IEEE double-precision operations. 200 ------------------------------------------------------------------------------- 201 */ 202 float64 float64_round_to_int( float64 ); 203 float64 float64_add( float64, float64 ); 204 float64 float64_sub( float64, float64 ); 205 float64 float64_mul( float64, float64 ); 206 float64 float64_div( float64, float64 ); 207 float64 float64_rem( float64, float64 ); 208 float64 float64_sqrt( float64 ); 209 flag float64_eq( float64, float64 ); 210 flag float64_le( float64, float64 ); 211 flag float64_lt( float64, float64 ); 212 flag float64_eq_signaling( float64, float64 ); 213 flag float64_le_quiet( float64, float64 ); 214 flag float64_lt_quiet( float64, float64 ); 215 #ifndef SOFTFLOAT_FOR_GCC 216 flag float64_is_signaling_nan( float64 ); 217 #endif 218 219 #ifdef FLOATX80 220 221 /* 222 ------------------------------------------------------------------------------- 223 Software IEC/IEEE extended double-precision conversion routines. 224 ------------------------------------------------------------------------------- 225 */ 226 int floatx80_to_int32( floatx80 ); 227 int floatx80_to_int32_round_to_zero( floatx80 ); 228 long long floatx80_to_int64( floatx80 ); 229 long long floatx80_to_int64_round_to_zero( floatx80 ); 230 float32 floatx80_to_float32( floatx80 ); 231 float64 floatx80_to_float64( floatx80 ); 232 #ifdef FLOAT128 233 float128 floatx80_to_float128( floatx80 ); 234 #endif 235 236 /* 237 ------------------------------------------------------------------------------- 238 Software IEC/IEEE extended double-precision rounding precision. Valid 239 values are 32, 64, and 80. 240 ------------------------------------------------------------------------------- 241 */ 242 extern int floatx80_rounding_precision; 243 244 /* 245 ------------------------------------------------------------------------------- 246 Software IEC/IEEE extended double-precision operations. 247 ------------------------------------------------------------------------------- 248 */ 249 floatx80 floatx80_round_to_int( floatx80 ); 250 floatx80 floatx80_add( floatx80, floatx80 ); 251 floatx80 floatx80_sub( floatx80, floatx80 ); 252 floatx80 floatx80_mul( floatx80, floatx80 ); 253 floatx80 floatx80_div( floatx80, floatx80 ); 254 floatx80 floatx80_rem( floatx80, floatx80 ); 255 floatx80 floatx80_sqrt( floatx80 ); 256 flag floatx80_eq( floatx80, floatx80 ); 257 flag floatx80_le( floatx80, floatx80 ); 258 flag floatx80_lt( floatx80, floatx80 ); 259 flag floatx80_eq_signaling( floatx80, floatx80 ); 260 flag floatx80_le_quiet( floatx80, floatx80 ); 261 flag floatx80_lt_quiet( floatx80, floatx80 ); 262 flag floatx80_is_signaling_nan( floatx80 ); 263 264 #endif 265 266 #ifdef FLOAT128 267 268 /* 269 ------------------------------------------------------------------------------- 270 Software IEC/IEEE quadruple-precision conversion routines. 271 ------------------------------------------------------------------------------- 272 */ 273 int float128_to_int32( float128 ); 274 int float128_to_int32_round_to_zero( float128 ); 275 long long float128_to_int64( float128 ); 276 long long float128_to_int64_round_to_zero( float128 ); 277 float32 float128_to_float32( float128 ); 278 float64 float128_to_float64( float128 ); 279 #ifdef FLOATX80 280 floatx80 float128_to_floatx80( float128 ); 281 #endif 282 283 /* 284 ------------------------------------------------------------------------------- 285 Software IEC/IEEE quadruple-precision operations. 286 ------------------------------------------------------------------------------- 287 */ 288 float128 float128_round_to_int( float128 ); 289 float128 float128_add( float128, float128 ); 290 float128 float128_sub( float128, float128 ); 291 float128 float128_mul( float128, float128 ); 292 float128 float128_div( float128, float128 ); 293 float128 float128_rem( float128, float128 ); 294 float128 float128_sqrt( float128 ); 295 flag float128_eq( float128, float128 ); 296 flag float128_le( float128, float128 ); 297 flag float128_lt( float128, float128 ); 298 flag float128_eq_signaling( float128, float128 ); 299 flag float128_le_quiet( float128, float128 ); 300 flag float128_lt_quiet( float128, float128 ); 301 flag float128_is_signaling_nan( float128 ); 302 303 #endif 304
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