1 /* $NetBSD: softfloat.h,v 1.4 2011/07/04 08:02:34 matt 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 #if defined(__mips_n32) || defined(__mips_n64) 46 #define FLOAT128 47 #endif 48 49 #include <machine/ieeefp.h> 50 51 /* 52 ------------------------------------------------------------------------------- 53 Software IEC/IEEE floating-point types. 54 ------------------------------------------------------------------------------- 55 */ 56 typedef unsigned int float32; 57 typedef unsigned long long float64; 58 #ifdef FLOATX80 59 typedef struct { 60 unsigned short high; 61 unsigned long long low; 62 } floatx80; 63 #endif 64 #ifdef FLOAT128 65 typedef struct { 66 unsigned long long high, low; 67 } float128; 68 #endif 69 70 /* 71 ------------------------------------------------------------------------------- 72 Software IEC/IEEE floating-point underflow tininess-detection mode. 73 ------------------------------------------------------------------------------- 74 */ 75 #ifndef SOFTFLOAT_FOR_GCC 76 extern int float_detect_tininess; 77 #endif 78 enum { 79 float_tininess_after_rounding = 0, 80 float_tininess_before_rounding = 1 81 }; 82 83 /* 84 ------------------------------------------------------------------------------- 85 Software IEC/IEEE floating-point rounding mode. 86 ------------------------------------------------------------------------------- 87 */ 88 extern fp_rnd float_rounding_mode; 89 enum { 90 float_round_nearest_even = FP_RN, 91 float_round_to_zero = FP_RZ, 92 float_round_down = FP_RM, 93 float_round_up = FP_RP 94 }; 95 96 /* 97 ------------------------------------------------------------------------------- 98 Software IEC/IEEE floating-point exception flags. 99 ------------------------------------------------------------------------------- 100 */ 101 extern fp_except float_exception_flags; 102 extern fp_except float_exception_mask; 103 enum { 104 float_flag_inexact = FP_X_IMP, 105 float_flag_underflow = FP_X_UFL, 106 float_flag_overflow = FP_X_OFL, 107 float_flag_divbyzero = FP_X_DZ, 108 float_flag_invalid = FP_X_INV 109 }; 110 111 /* 112 ------------------------------------------------------------------------------- 113 Routine to raise any or all of the software IEC/IEEE floating-point 114 exception flags. 115 ------------------------------------------------------------------------------- 116 */ 117 void float_raise( fp_except ); 118 119 /* 120 ------------------------------------------------------------------------------- 121 Software IEC/IEEE integer-to-floating-point conversion routines. 122 ------------------------------------------------------------------------------- 123 */ 124 float32 int32_to_float32( int32 ); 125 float32 uint32_to_float32( uint32 ); 126 float64 int32_to_float64( int32 ); 127 float64 uint32_to_float64( uint32 ); 128 #ifdef FLOATX80 129 floatx80 int32_to_floatx80( int32 ); 130 floatx80 uint32_to_floatx80( uint32 ); 131 #endif 132 #ifdef FLOAT128 133 float128 int32_to_float128( int32 ); 134 float128 uint32_to_float128( uint32 ); 135 #endif 136 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 137 float32 int64_to_float32( long long ); 138 float64 int64_to_float64( long long ); 139 #ifdef FLOATX80 140 floatx80 int64_to_floatx80( long long ); 141 #endif 142 #endif 143 #ifdef FLOAT128 144 float128 int64_to_float128( long long ); 145 #endif 146 147 /* 148 ------------------------------------------------------------------------------- 149 Software IEC/IEEE single-precision conversion routines. 150 ------------------------------------------------------------------------------- 151 */ 152 int float32_to_int32( float32 ); 153 int float32_to_int32_round_to_zero( float32 ); 154 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 155 unsigned int float32_to_uint32_round_to_zero( float32 ); 156 #endif 157 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 158 long long float32_to_int64( float32 ); 159 long long float32_to_int64_round_to_zero( float32 ); 160 #endif 161 float64 float32_to_float64( float32 ); 162 #ifdef FLOATX80 163 floatx80 float32_to_floatx80( float32 ); 164 #endif 165 #ifdef FLOAT128 166 float128 float32_to_float128( float32 ); 167 #endif 168 169 /* 170 ------------------------------------------------------------------------------- 171 Software IEC/IEEE single-precision operations. 172 ------------------------------------------------------------------------------- 173 */ 174 float32 float32_round_to_int( float32 ); 175 float32 float32_add( float32, float32 ); 176 float32 float32_sub( float32, float32 ); 177 float32 float32_mul( float32, float32 ); 178 float32 float32_div( float32, float32 ); 179 float32 float32_rem( float32, float32 ); 180 float32 float32_sqrt( float32 ); 181 int float32_eq( float32, float32 ); 182 int float32_le( float32, float32 ); 183 int float32_lt( float32, float32 ); 184 int float32_eq_signaling( float32, float32 ); 185 int float32_le_quiet( float32, float32 ); 186 int float32_lt_quiet( float32, float32 ); 187 #ifndef SOFTFLOAT_FOR_GCC 188 int float32_is_signaling_nan( float32 ); 189 #endif 190 191 /* 192 ------------------------------------------------------------------------------- 193 Software IEC/IEEE double-precision conversion routines. 194 ------------------------------------------------------------------------------- 195 */ 196 int float64_to_int32( float64 ); 197 int float64_to_int32_round_to_zero( float64 ); 198 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 199 unsigned int float64_to_uint32_round_to_zero( float64 ); 200 #endif 201 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 202 long long float64_to_int64( float64 ); 203 long long float64_to_int64_round_to_zero( float64 ); 204 #endif 205 float32 float64_to_float32( float64 ); 206 #ifdef FLOATX80 207 floatx80 float64_to_floatx80( float64 ); 208 #endif 209 #ifdef FLOAT128 210 float128 float64_to_float128( float64 ); 211 #endif 212 213 /* 214 ------------------------------------------------------------------------------- 215 Software IEC/IEEE double-precision operations. 216 ------------------------------------------------------------------------------- 217 */ 218 float64 float64_round_to_int( float64 ); 219 float64 float64_add( float64, float64 ); 220 float64 float64_sub( float64, float64 ); 221 float64 float64_mul( float64, float64 ); 222 float64 float64_div( float64, float64 ); 223 float64 float64_rem( float64, float64 ); 224 float64 float64_sqrt( float64 ); 225 int float64_eq( float64, float64 ); 226 int float64_le( float64, float64 ); 227 int float64_lt( float64, float64 ); 228 int float64_eq_signaling( float64, float64 ); 229 int float64_le_quiet( float64, float64 ); 230 int float64_lt_quiet( float64, float64 ); 231 #ifndef SOFTFLOAT_FOR_GCC 232 int float64_is_signaling_nan( float64 ); 233 #endif 234 235 #ifdef FLOATX80 236 237 /* 238 ------------------------------------------------------------------------------- 239 Software IEC/IEEE extended double-precision conversion routines. 240 ------------------------------------------------------------------------------- 241 */ 242 int floatx80_to_int32( floatx80 ); 243 int floatx80_to_int32_round_to_zero( floatx80 ); 244 long long floatx80_to_int64( floatx80 ); 245 long long floatx80_to_int64_round_to_zero( floatx80 ); 246 float32 floatx80_to_float32( floatx80 ); 247 float64 floatx80_to_float64( floatx80 ); 248 #ifdef FLOAT128 249 float128 floatx80_to_float128( floatx80 ); 250 #endif 251 252 /* 253 ------------------------------------------------------------------------------- 254 Software IEC/IEEE extended double-precision rounding precision. Valid 255 values are 32, 64, and 80. 256 ------------------------------------------------------------------------------- 257 */ 258 extern int floatx80_rounding_precision; 259 260 /* 261 ------------------------------------------------------------------------------- 262 Software IEC/IEEE extended double-precision operations. 263 ------------------------------------------------------------------------------- 264 */ 265 floatx80 floatx80_round_to_int( floatx80 ); 266 floatx80 floatx80_add( floatx80, floatx80 ); 267 floatx80 floatx80_sub( floatx80, floatx80 ); 268 floatx80 floatx80_mul( floatx80, floatx80 ); 269 floatx80 floatx80_div( floatx80, floatx80 ); 270 floatx80 floatx80_rem( floatx80, floatx80 ); 271 floatx80 floatx80_sqrt( floatx80 ); 272 int floatx80_eq( floatx80, floatx80 ); 273 int floatx80_le( floatx80, floatx80 ); 274 int floatx80_lt( floatx80, floatx80 ); 275 int floatx80_eq_signaling( floatx80, floatx80 ); 276 int floatx80_le_quiet( floatx80, floatx80 ); 277 int floatx80_lt_quiet( floatx80, floatx80 ); 278 int floatx80_is_signaling_nan( floatx80 ); 279 280 #endif 281 282 #ifdef FLOAT128 283 284 /* 285 ------------------------------------------------------------------------------- 286 Software IEC/IEEE quadruple-precision conversion routines. 287 ------------------------------------------------------------------------------- 288 */ 289 int float128_to_int32( float128 ); 290 int float128_to_int32_round_to_zero( float128 ); 291 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 292 unsigned int float128_to_uint32_round_to_zero( float64 ); 293 #endif 294 long long float128_to_int64( float128 ); 295 long long float128_to_int64_round_to_zero( float128 ); 296 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 297 unsigned long long float128_to_uint64_round_to_zero( float128 ); 298 #endif 299 float32 float128_to_float32( float128 ); 300 float64 float128_to_float64( float128 ); 301 #ifdef FLOATX80 302 floatx80 float128_to_floatx80( float128 ); 303 #endif 304 305 /* 306 ------------------------------------------------------------------------------- 307 Software IEC/IEEE quadruple-precision operations. 308 ------------------------------------------------------------------------------- 309 */ 310 float128 float128_round_to_int( float128 ); 311 float128 float128_add( float128, float128 ); 312 float128 float128_sub( float128, float128 ); 313 float128 float128_mul( float128, float128 ); 314 float128 float128_div( float128, float128 ); 315 float128 float128_rem( float128, float128 ); 316 float128 float128_sqrt( float128 ); 317 int float128_eq( float128, float128 ); 318 int float128_le( float128, float128 ); 319 int float128_lt( float128, float128 ); 320 int float128_eq_signaling( float128, float128 ); 321 int float128_le_quiet( float128, float128 ); 322 int float128_lt_quiet( float128, float128 ); 323 int float128_is_signaling_nan( float128 ); 324 flag float128_is_nan( float128 ); 325 326 #endif 327 328