1 1.5 matt /* $NetBSD: softfloat.h,v 1.5 2011/07/07 07:14:57 matt Exp $ */ 2 1.2 matt 3 1.2 matt /* This is a derivative work. */ 4 1.2 matt 5 1.2 matt /* 6 1.2 matt =============================================================================== 7 1.2 matt 8 1.2 matt This C header file is part of the SoftFloat IEC/IEEE Floating-point 9 1.2 matt Arithmetic Package, Release 2a. 10 1.2 matt 11 1.2 matt Written by John R. Hauser. This work was made possible in part by the 12 1.2 matt International Computer Science Institute, located at Suite 600, 1947 Center 13 1.2 matt Street, Berkeley, California 94704. Funding was partially provided by the 14 1.2 matt National Science Foundation under grant MIP-9311980. The original version 15 1.2 matt of this code was written as part of a project to build a fixed-point vector 16 1.2 matt processor in collaboration with the University of California at Berkeley, 17 1.2 matt overseen by Profs. Nelson Morgan and John Wawrzynek. More information 18 1.2 matt is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 19 1.2 matt arithmetic/SoftFloat.html'. 20 1.2 matt 21 1.2 matt THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 22 1.2 matt has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 23 1.2 matt TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 24 1.2 matt PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 25 1.2 matt AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 26 1.2 matt 27 1.2 matt Derivative works are acceptable, even for commercial purposes, so long as 28 1.2 matt (1) they include prominent notice that the work is derivative, and (2) they 29 1.2 matt include prominent notice akin to these four paragraphs for those parts of 30 1.2 matt this code that are retained. 31 1.2 matt 32 1.2 matt =============================================================================== 33 1.2 matt */ 34 1.2 matt 35 1.2 matt /* 36 1.2 matt ------------------------------------------------------------------------------- 37 1.2 matt The macro `FLOATX80' must be defined to enable the extended double-precision 38 1.2 matt floating-point format `floatx80'. If this macro is not defined, the 39 1.2 matt `floatx80' type will not be defined, and none of the functions that either 40 1.2 matt input or output the `floatx80' type will be defined. The same applies to 41 1.2 matt the `FLOAT128' macro and the quadruple-precision format `float128'. 42 1.2 matt ------------------------------------------------------------------------------- 43 1.2 matt */ 44 1.2 matt /* #define FLOATX80 */ 45 1.3 matt #if defined(__mips_n32) || defined(__mips_n64) 46 1.3 matt #define FLOAT128 47 1.3 matt #endif 48 1.2 matt 49 1.2 matt #include <machine/ieeefp.h> 50 1.2 matt 51 1.2 matt /* 52 1.2 matt ------------------------------------------------------------------------------- 53 1.2 matt Software IEC/IEEE floating-point types. 54 1.2 matt ------------------------------------------------------------------------------- 55 1.2 matt */ 56 1.2 matt typedef unsigned int float32; 57 1.2 matt typedef unsigned long long float64; 58 1.2 matt #ifdef FLOATX80 59 1.2 matt typedef struct { 60 1.2 matt unsigned short high; 61 1.2 matt unsigned long long low; 62 1.2 matt } floatx80; 63 1.2 matt #endif 64 1.2 matt #ifdef FLOAT128 65 1.2 matt typedef struct { 66 1.2 matt unsigned long long high, low; 67 1.2 matt } float128; 68 1.2 matt #endif 69 1.2 matt 70 1.2 matt /* 71 1.2 matt ------------------------------------------------------------------------------- 72 1.2 matt Software IEC/IEEE floating-point underflow tininess-detection mode. 73 1.2 matt ------------------------------------------------------------------------------- 74 1.2 matt */ 75 1.2 matt #ifndef SOFTFLOAT_FOR_GCC 76 1.2 matt extern int float_detect_tininess; 77 1.2 matt #endif 78 1.2 matt enum { 79 1.2 matt float_tininess_after_rounding = 0, 80 1.2 matt float_tininess_before_rounding = 1 81 1.2 matt }; 82 1.2 matt 83 1.2 matt /* 84 1.2 matt ------------------------------------------------------------------------------- 85 1.2 matt Software IEC/IEEE floating-point rounding mode. 86 1.2 matt ------------------------------------------------------------------------------- 87 1.2 matt */ 88 1.2 matt extern fp_rnd float_rounding_mode; 89 1.5 matt #define float_round_nearest_even FP_RN 90 1.5 matt #define float_round_to_zero FP_RZ 91 1.5 matt #define float_round_down FP_RM 92 1.5 matt #define float_round_up FP_RP 93 1.2 matt 94 1.2 matt /* 95 1.2 matt ------------------------------------------------------------------------------- 96 1.2 matt Software IEC/IEEE floating-point exception flags. 97 1.2 matt ------------------------------------------------------------------------------- 98 1.2 matt */ 99 1.2 matt extern fp_except float_exception_flags; 100 1.2 matt extern fp_except float_exception_mask; 101 1.2 matt enum { 102 1.2 matt float_flag_inexact = FP_X_IMP, 103 1.2 matt float_flag_underflow = FP_X_UFL, 104 1.2 matt float_flag_overflow = FP_X_OFL, 105 1.2 matt float_flag_divbyzero = FP_X_DZ, 106 1.2 matt float_flag_invalid = FP_X_INV 107 1.2 matt }; 108 1.2 matt 109 1.2 matt /* 110 1.2 matt ------------------------------------------------------------------------------- 111 1.2 matt Routine to raise any or all of the software IEC/IEEE floating-point 112 1.2 matt exception flags. 113 1.2 matt ------------------------------------------------------------------------------- 114 1.2 matt */ 115 1.2 matt void float_raise( fp_except ); 116 1.2 matt 117 1.2 matt /* 118 1.2 matt ------------------------------------------------------------------------------- 119 1.2 matt Software IEC/IEEE integer-to-floating-point conversion routines. 120 1.2 matt ------------------------------------------------------------------------------- 121 1.2 matt */ 122 1.4 matt float32 int32_to_float32( int32 ); 123 1.4 matt float32 uint32_to_float32( uint32 ); 124 1.4 matt float64 int32_to_float64( int32 ); 125 1.4 matt float64 uint32_to_float64( uint32 ); 126 1.2 matt #ifdef FLOATX80 127 1.4 matt floatx80 int32_to_floatx80( int32 ); 128 1.4 matt floatx80 uint32_to_floatx80( uint32 ); 129 1.2 matt #endif 130 1.2 matt #ifdef FLOAT128 131 1.4 matt float128 int32_to_float128( int32 ); 132 1.4 matt float128 uint32_to_float128( uint32 ); 133 1.2 matt #endif 134 1.2 matt #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 135 1.2 matt float32 int64_to_float32( long long ); 136 1.2 matt float64 int64_to_float64( long long ); 137 1.2 matt #ifdef FLOATX80 138 1.2 matt floatx80 int64_to_floatx80( long long ); 139 1.2 matt #endif 140 1.3 matt #endif 141 1.2 matt #ifdef FLOAT128 142 1.2 matt float128 int64_to_float128( long long ); 143 1.2 matt #endif 144 1.2 matt 145 1.2 matt /* 146 1.2 matt ------------------------------------------------------------------------------- 147 1.2 matt Software IEC/IEEE single-precision conversion routines. 148 1.2 matt ------------------------------------------------------------------------------- 149 1.2 matt */ 150 1.2 matt int float32_to_int32( float32 ); 151 1.2 matt int float32_to_int32_round_to_zero( float32 ); 152 1.2 matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 153 1.2 matt unsigned int float32_to_uint32_round_to_zero( float32 ); 154 1.2 matt #endif 155 1.2 matt #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 156 1.2 matt long long float32_to_int64( float32 ); 157 1.2 matt long long float32_to_int64_round_to_zero( float32 ); 158 1.2 matt #endif 159 1.2 matt float64 float32_to_float64( float32 ); 160 1.2 matt #ifdef FLOATX80 161 1.2 matt floatx80 float32_to_floatx80( float32 ); 162 1.2 matt #endif 163 1.2 matt #ifdef FLOAT128 164 1.2 matt float128 float32_to_float128( float32 ); 165 1.2 matt #endif 166 1.2 matt 167 1.2 matt /* 168 1.2 matt ------------------------------------------------------------------------------- 169 1.2 matt Software IEC/IEEE single-precision operations. 170 1.2 matt ------------------------------------------------------------------------------- 171 1.2 matt */ 172 1.2 matt float32 float32_round_to_int( float32 ); 173 1.2 matt float32 float32_add( float32, float32 ); 174 1.2 matt float32 float32_sub( float32, float32 ); 175 1.2 matt float32 float32_mul( float32, float32 ); 176 1.2 matt float32 float32_div( float32, float32 ); 177 1.2 matt float32 float32_rem( float32, float32 ); 178 1.2 matt float32 float32_sqrt( float32 ); 179 1.2 matt int float32_eq( float32, float32 ); 180 1.2 matt int float32_le( float32, float32 ); 181 1.2 matt int float32_lt( float32, float32 ); 182 1.2 matt int float32_eq_signaling( float32, float32 ); 183 1.2 matt int float32_le_quiet( float32, float32 ); 184 1.2 matt int float32_lt_quiet( float32, float32 ); 185 1.2 matt #ifndef SOFTFLOAT_FOR_GCC 186 1.2 matt int float32_is_signaling_nan( float32 ); 187 1.2 matt #endif 188 1.2 matt 189 1.2 matt /* 190 1.2 matt ------------------------------------------------------------------------------- 191 1.2 matt Software IEC/IEEE double-precision conversion routines. 192 1.2 matt ------------------------------------------------------------------------------- 193 1.2 matt */ 194 1.2 matt int float64_to_int32( float64 ); 195 1.2 matt int float64_to_int32_round_to_zero( float64 ); 196 1.2 matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 197 1.2 matt unsigned int float64_to_uint32_round_to_zero( float64 ); 198 1.2 matt #endif 199 1.2 matt #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 200 1.2 matt long long float64_to_int64( float64 ); 201 1.2 matt long long float64_to_int64_round_to_zero( float64 ); 202 1.2 matt #endif 203 1.2 matt float32 float64_to_float32( float64 ); 204 1.2 matt #ifdef FLOATX80 205 1.2 matt floatx80 float64_to_floatx80( float64 ); 206 1.2 matt #endif 207 1.2 matt #ifdef FLOAT128 208 1.2 matt float128 float64_to_float128( float64 ); 209 1.2 matt #endif 210 1.2 matt 211 1.2 matt /* 212 1.2 matt ------------------------------------------------------------------------------- 213 1.2 matt Software IEC/IEEE double-precision operations. 214 1.2 matt ------------------------------------------------------------------------------- 215 1.2 matt */ 216 1.2 matt float64 float64_round_to_int( float64 ); 217 1.2 matt float64 float64_add( float64, float64 ); 218 1.2 matt float64 float64_sub( float64, float64 ); 219 1.2 matt float64 float64_mul( float64, float64 ); 220 1.2 matt float64 float64_div( float64, float64 ); 221 1.2 matt float64 float64_rem( float64, float64 ); 222 1.2 matt float64 float64_sqrt( float64 ); 223 1.2 matt int float64_eq( float64, float64 ); 224 1.2 matt int float64_le( float64, float64 ); 225 1.2 matt int float64_lt( float64, float64 ); 226 1.2 matt int float64_eq_signaling( float64, float64 ); 227 1.2 matt int float64_le_quiet( float64, float64 ); 228 1.2 matt int float64_lt_quiet( float64, float64 ); 229 1.2 matt #ifndef SOFTFLOAT_FOR_GCC 230 1.2 matt int float64_is_signaling_nan( float64 ); 231 1.2 matt #endif 232 1.2 matt 233 1.2 matt #ifdef FLOATX80 234 1.2 matt 235 1.2 matt /* 236 1.2 matt ------------------------------------------------------------------------------- 237 1.2 matt Software IEC/IEEE extended double-precision conversion routines. 238 1.2 matt ------------------------------------------------------------------------------- 239 1.2 matt */ 240 1.2 matt int floatx80_to_int32( floatx80 ); 241 1.2 matt int floatx80_to_int32_round_to_zero( floatx80 ); 242 1.2 matt long long floatx80_to_int64( floatx80 ); 243 1.2 matt long long floatx80_to_int64_round_to_zero( floatx80 ); 244 1.2 matt float32 floatx80_to_float32( floatx80 ); 245 1.2 matt float64 floatx80_to_float64( floatx80 ); 246 1.2 matt #ifdef FLOAT128 247 1.2 matt float128 floatx80_to_float128( floatx80 ); 248 1.2 matt #endif 249 1.2 matt 250 1.2 matt /* 251 1.2 matt ------------------------------------------------------------------------------- 252 1.2 matt Software IEC/IEEE extended double-precision rounding precision. Valid 253 1.2 matt values are 32, 64, and 80. 254 1.2 matt ------------------------------------------------------------------------------- 255 1.2 matt */ 256 1.2 matt extern int floatx80_rounding_precision; 257 1.2 matt 258 1.2 matt /* 259 1.2 matt ------------------------------------------------------------------------------- 260 1.2 matt Software IEC/IEEE extended double-precision operations. 261 1.2 matt ------------------------------------------------------------------------------- 262 1.2 matt */ 263 1.2 matt floatx80 floatx80_round_to_int( floatx80 ); 264 1.2 matt floatx80 floatx80_add( floatx80, floatx80 ); 265 1.2 matt floatx80 floatx80_sub( floatx80, floatx80 ); 266 1.2 matt floatx80 floatx80_mul( floatx80, floatx80 ); 267 1.2 matt floatx80 floatx80_div( floatx80, floatx80 ); 268 1.2 matt floatx80 floatx80_rem( floatx80, floatx80 ); 269 1.2 matt floatx80 floatx80_sqrt( floatx80 ); 270 1.2 matt int floatx80_eq( floatx80, floatx80 ); 271 1.2 matt int floatx80_le( floatx80, floatx80 ); 272 1.2 matt int floatx80_lt( floatx80, floatx80 ); 273 1.2 matt int floatx80_eq_signaling( floatx80, floatx80 ); 274 1.2 matt int floatx80_le_quiet( floatx80, floatx80 ); 275 1.2 matt int floatx80_lt_quiet( floatx80, floatx80 ); 276 1.2 matt int floatx80_is_signaling_nan( floatx80 ); 277 1.2 matt 278 1.2 matt #endif 279 1.2 matt 280 1.2 matt #ifdef FLOAT128 281 1.2 matt 282 1.2 matt /* 283 1.2 matt ------------------------------------------------------------------------------- 284 1.2 matt Software IEC/IEEE quadruple-precision conversion routines. 285 1.2 matt ------------------------------------------------------------------------------- 286 1.2 matt */ 287 1.2 matt int float128_to_int32( float128 ); 288 1.2 matt int float128_to_int32_round_to_zero( float128 ); 289 1.2 matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 290 1.2 matt unsigned int float128_to_uint32_round_to_zero( float64 ); 291 1.2 matt #endif 292 1.2 matt long long float128_to_int64( float128 ); 293 1.2 matt long long float128_to_int64_round_to_zero( float128 ); 294 1.2 matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 295 1.2 matt unsigned long long float128_to_uint64_round_to_zero( float128 ); 296 1.2 matt #endif 297 1.2 matt float32 float128_to_float32( float128 ); 298 1.2 matt float64 float128_to_float64( float128 ); 299 1.2 matt #ifdef FLOATX80 300 1.2 matt floatx80 float128_to_floatx80( float128 ); 301 1.2 matt #endif 302 1.2 matt 303 1.2 matt /* 304 1.2 matt ------------------------------------------------------------------------------- 305 1.2 matt Software IEC/IEEE quadruple-precision operations. 306 1.2 matt ------------------------------------------------------------------------------- 307 1.2 matt */ 308 1.2 matt float128 float128_round_to_int( float128 ); 309 1.2 matt float128 float128_add( float128, float128 ); 310 1.2 matt float128 float128_sub( float128, float128 ); 311 1.2 matt float128 float128_mul( float128, float128 ); 312 1.2 matt float128 float128_div( float128, float128 ); 313 1.2 matt float128 float128_rem( float128, float128 ); 314 1.2 matt float128 float128_sqrt( float128 ); 315 1.2 matt int float128_eq( float128, float128 ); 316 1.2 matt int float128_le( float128, float128 ); 317 1.2 matt int float128_lt( float128, float128 ); 318 1.2 matt int float128_eq_signaling( float128, float128 ); 319 1.2 matt int float128_le_quiet( float128, float128 ); 320 1.2 matt int float128_lt_quiet( float128, float128 ); 321 1.2 matt int float128_is_signaling_nan( float128 ); 322 1.3 matt flag float128_is_nan( float128 ); 323 1.2 matt 324 1.2 matt #endif 325 1.2 matt 326