softfloat.h revision 1.4
1 /* $NetBSD: softfloat.h,v 1.4 2002/05/29 15:58:03 eeh 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 extern int8 float_detect_tininess; 74 enum { 75 float_tininess_after_rounding = 0, 76 float_tininess_before_rounding = 1 77 }; 78 79 /* 80 ------------------------------------------------------------------------------- 81 Software IEC/IEEE floating-point rounding mode. 82 ------------------------------------------------------------------------------- 83 */ 84 extern fp_rnd float_rounding_mode; 85 enum { 86 float_round_nearest_even = FP_RN, 87 float_round_to_zero = FP_RZ, 88 float_round_down = FP_RM, 89 float_round_up = FP_RP 90 }; 91 92 /* 93 ------------------------------------------------------------------------------- 94 Software IEC/IEEE floating-point exception flags. 95 ------------------------------------------------------------------------------- 96 */ 97 extern fp_except float_exception_flags; 98 extern fp_except float_exception_mask; 99 enum { 100 float_flag_inexact = FP_X_IMP, 101 float_flag_underflow = FP_X_UFL, 102 float_flag_overflow = FP_X_OFL, 103 float_flag_divbyzero = FP_X_DZ, 104 float_flag_invalid = FP_X_INV 105 }; 106 107 /* 108 ------------------------------------------------------------------------------- 109 Routine to raise any or all of the software IEC/IEEE floating-point 110 exception flags. 111 ------------------------------------------------------------------------------- 112 */ 113 void float_raise( fp_except ); 114 115 /* 116 ------------------------------------------------------------------------------- 117 Software IEC/IEEE integer-to-floating-point conversion routines. 118 ------------------------------------------------------------------------------- 119 */ 120 float32 int32_to_float32( int ); 121 float64 int32_to_float64( int ); 122 #ifdef FLOATX80 123 floatx80 int32_to_floatx80( int ); 124 #endif 125 #ifdef FLOAT128 126 float128 int32_to_float128( int ); 127 #endif 128 float32 int64_to_float32( long long ); 129 float64 int64_to_float64( long long ); 130 #ifdef FLOATX80 131 floatx80 int64_to_floatx80( long long ); 132 #endif 133 #ifdef FLOAT128 134 float128 int64_to_float128( long long ); 135 #endif 136 137 /* 138 ------------------------------------------------------------------------------- 139 Software IEC/IEEE single-precision conversion routines. 140 ------------------------------------------------------------------------------- 141 */ 142 int float32_to_int32( float32 ); 143 int float32_to_int32_round_to_zero( float32 ); 144 unsigned int float32_to_uint32_round_to_zero( float32 ); 145 long long float32_to_int64( float32 ); 146 long long float32_to_int64_round_to_zero( float32 ); 147 float64 float32_to_float64( float32 ); 148 #ifdef FLOATX80 149 floatx80 float32_to_floatx80( float32 ); 150 #endif 151 #ifdef FLOAT128 152 float128 float32_to_float128( float32 ); 153 #endif 154 155 /* 156 ------------------------------------------------------------------------------- 157 Software IEC/IEEE single-precision operations. 158 ------------------------------------------------------------------------------- 159 */ 160 float32 float32_round_to_int( float32 ); 161 float32 float32_add( float32, float32 ); 162 float32 float32_sub( float32, float32 ); 163 float32 float32_mul( float32, float32 ); 164 float32 float32_div( float32, float32 ); 165 float32 float32_rem( float32, float32 ); 166 float32 float32_sqrt( float32 ); 167 flag float32_eq( float32, float32 ); 168 flag float32_le( float32, float32 ); 169 flag float32_lt( float32, float32 ); 170 flag float32_eq_signaling( float32, float32 ); 171 flag float32_le_quiet( float32, float32 ); 172 flag float32_lt_quiet( float32, float32 ); 173 #ifndef SOFTFLOAT_FOR_GCC 174 flag float32_is_signaling_nan( float32 ); 175 #endif 176 177 /* 178 ------------------------------------------------------------------------------- 179 Software IEC/IEEE double-precision conversion routines. 180 ------------------------------------------------------------------------------- 181 */ 182 int float64_to_int32( float64 ); 183 int float64_to_int32_round_to_zero( float64 ); 184 unsigned int float64_to_uint32_round_to_zero( float64 ); 185 long long float64_to_int64( float64 ); 186 long long float64_to_int64_round_to_zero( float64 ); 187 float32 float64_to_float32( float64 ); 188 #ifdef FLOATX80 189 floatx80 float64_to_floatx80( float64 ); 190 #endif 191 #ifdef FLOAT128 192 float128 float64_to_float128( float64 ); 193 #endif 194 195 /* 196 ------------------------------------------------------------------------------- 197 Software IEC/IEEE double-precision operations. 198 ------------------------------------------------------------------------------- 199 */ 200 float64 float64_round_to_int( float64 ); 201 float64 float64_add( float64, float64 ); 202 float64 float64_sub( float64, float64 ); 203 float64 float64_mul( float64, float64 ); 204 float64 float64_div( float64, float64 ); 205 float64 float64_rem( float64, float64 ); 206 float64 float64_sqrt( float64 ); 207 flag float64_eq( float64, float64 ); 208 flag float64_le( float64, float64 ); 209 flag float64_lt( float64, float64 ); 210 flag float64_eq_signaling( float64, float64 ); 211 flag float64_le_quiet( float64, float64 ); 212 flag float64_lt_quiet( float64, float64 ); 213 #ifndef SOFTFLOAT_FOR_GCC 214 flag float64_is_signaling_nan( float64 ); 215 #endif 216 217 #ifdef FLOATX80 218 219 /* 220 ------------------------------------------------------------------------------- 221 Software IEC/IEEE extended double-precision conversion routines. 222 ------------------------------------------------------------------------------- 223 */ 224 int floatx80_to_int32( floatx80 ); 225 int floatx80_to_int32_round_to_zero( floatx80 ); 226 long long floatx80_to_int64( floatx80 ); 227 long long floatx80_to_int64_round_to_zero( floatx80 ); 228 float32 floatx80_to_float32( floatx80 ); 229 float64 floatx80_to_float64( floatx80 ); 230 #ifdef FLOAT128 231 float128 floatx80_to_float128( floatx80 ); 232 #endif 233 234 /* 235 ------------------------------------------------------------------------------- 236 Software IEC/IEEE extended double-precision rounding precision. Valid 237 values are 32, 64, and 80. 238 ------------------------------------------------------------------------------- 239 */ 240 extern int floatx80_rounding_precision; 241 242 /* 243 ------------------------------------------------------------------------------- 244 Software IEC/IEEE extended double-precision operations. 245 ------------------------------------------------------------------------------- 246 */ 247 floatx80 floatx80_round_to_int( floatx80 ); 248 floatx80 floatx80_add( floatx80, floatx80 ); 249 floatx80 floatx80_sub( floatx80, floatx80 ); 250 floatx80 floatx80_mul( floatx80, floatx80 ); 251 floatx80 floatx80_div( floatx80, floatx80 ); 252 floatx80 floatx80_rem( floatx80, floatx80 ); 253 floatx80 floatx80_sqrt( floatx80 ); 254 flag floatx80_eq( floatx80, floatx80 ); 255 flag floatx80_le( floatx80, floatx80 ); 256 flag floatx80_lt( floatx80, floatx80 ); 257 flag floatx80_eq_signaling( floatx80, floatx80 ); 258 flag floatx80_le_quiet( floatx80, floatx80 ); 259 flag floatx80_lt_quiet( floatx80, floatx80 ); 260 flag floatx80_is_signaling_nan( floatx80 ); 261 262 #endif 263 264 #ifdef FLOAT128 265 266 /* 267 ------------------------------------------------------------------------------- 268 Software IEC/IEEE quadruple-precision conversion routines. 269 ------------------------------------------------------------------------------- 270 */ 271 int float128_to_int32( float128 ); 272 int float128_to_int32_round_to_zero( float128 ); 273 long long float128_to_int64( float128 ); 274 long long float128_to_int64_round_to_zero( float128 ); 275 float32 float128_to_float32( float128 ); 276 float64 float128_to_float64( float128 ); 277 #ifdef FLOATX80 278 floatx80 float128_to_floatx80( float128 ); 279 #endif 280 281 /* 282 ------------------------------------------------------------------------------- 283 Software IEC/IEEE quadruple-precision operations. 284 ------------------------------------------------------------------------------- 285 */ 286 float128 float128_round_to_int( float128 ); 287 float128 float128_add( float128, float128 ); 288 float128 float128_sub( float128, float128 ); 289 float128 float128_mul( float128, float128 ); 290 float128 float128_div( float128, float128 ); 291 float128 float128_rem( float128, float128 ); 292 float128 float128_sqrt( float128 ); 293 flag float128_eq( float128, float128 ); 294 flag float128_le( float128, float128 ); 295 flag float128_lt( float128, float128 ); 296 flag float128_eq_signaling( float128, float128 ); 297 flag float128_le_quiet( float128, float128 ); 298 flag float128_lt_quiet( float128, float128 ); 299 flag float128_is_signaling_nan( float128 ); 300 301 #endif 302
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