1 /* $NetBSD: softfloat.h,v 1.6 2002/05/12 13:12:46 bjh21 Exp $ */ 2 /* $FreeBSD$ */ 3 4 /* This is a derivative work. */ 5 6 /* 7 =============================================================================== 8 9 This C header file is part of the SoftFloat IEC/IEEE Floating-point 10 Arithmetic Package, Release 2a. 11 12 Written by John R. Hauser. This work was made possible in part by the 13 International Computer Science Institute, located at Suite 600, 1947 Center 14 Street, Berkeley, California 94704. Funding was partially provided by the 15 National Science Foundation under grant MIP-9311980. The original version 16 of this code was written as part of a project to build a fixed-point vector 17 processor in collaboration with the University of California at Berkeley, 18 overseen by Profs. Nelson Morgan and John Wawrzynek. More information 19 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 20 arithmetic/SoftFloat.html'. 21 22 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 23 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 24 TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 25 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 26 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 27 28 Derivative works are acceptable, even for commercial purposes, so long as 29 (1) they include prominent notice that the work is derivative, and (2) they 30 include prominent notice akin to these four paragraphs for those parts of 31 this code that are retained. 32 33 =============================================================================== 34 */ 35 36 /* 37 ------------------------------------------------------------------------------- 38 The macro `FLOATX80' must be defined to enable the extended double-precision 39 floating-point format `floatx80'. If this macro is not defined, the 40 `floatx80' type will not be defined, and none of the functions that either 41 input or output the `floatx80' type will be defined. The same applies to 42 the `FLOAT128' macro and the quadruple-precision format `float128'. 43 ------------------------------------------------------------------------------- 44 */ 45 /* #define FLOATX80 */ 46 /* #define FLOAT128 */ 47 48 #include <machine/ieeefp.h> 49 50 /* 51 ------------------------------------------------------------------------------- 52 Software IEC/IEEE floating-point types. 53 ------------------------------------------------------------------------------- 54 */ 55 typedef unsigned int float32; 56 typedef unsigned long long float64; 57 #ifdef FLOATX80 58 typedef struct { 59 unsigned short high; 60 unsigned long long low; 61 } floatx80; 62 #endif 63 #ifdef FLOAT128 64 typedef struct { 65 unsigned long long high, low; 66 } float128; 67 #endif 68 69 /* 70 ------------------------------------------------------------------------------- 71 Software IEC/IEEE floating-point underflow tininess-detection mode. 72 ------------------------------------------------------------------------------- 73 */ 74 extern int float_detect_tininess; 75 enum { 76 float_tininess_after_rounding = 0, 77 float_tininess_before_rounding = 1 78 }; 79 80 /* 81 ------------------------------------------------------------------------------- 82 Software IEC/IEEE floating-point rounding mode. 83 ------------------------------------------------------------------------------- 84 */ 85 extern fp_rnd_t float_rounding_mode; 86 enum { 87 float_round_nearest_even = FP_RN, 88 float_round_to_zero = FP_RZ, 89 float_round_down = FP_RM, 90 float_round_up = FP_RP 91 }; 92 93 /* 94 ------------------------------------------------------------------------------- 95 Software IEC/IEEE floating-point exception flags. 96 ------------------------------------------------------------------------------- 97 */ 98 extern fp_except float_exception_flags; 99 extern fp_except float_exception_mask; 100 enum { 101 float_flag_inexact = FP_X_IMP, 102 float_flag_underflow = FP_X_UFL, 103 float_flag_overflow = FP_X_OFL, 104 float_flag_divbyzero = FP_X_DZ, 105 float_flag_invalid = FP_X_INV 106 }; 107 108 /* 109 ------------------------------------------------------------------------------- 110 Routine to raise any or all of the software IEC/IEEE floating-point 111 exception flags. 112 ------------------------------------------------------------------------------- 113 */ 114 void float_raise( fp_except ); 115 116 /* 117 ------------------------------------------------------------------------------- 118 Software IEC/IEEE integer-to-floating-point conversion routines. 119 ------------------------------------------------------------------------------- 120 */ 121 float32 int32_to_float32( int ); 122 float64 int32_to_float64( int ); 123 #ifdef FLOATX80 124 floatx80 int32_to_floatx80( int ); 125 #endif 126 #ifdef FLOAT128 127 float128 int32_to_float128( int ); 128 #endif 129 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 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 #endif 139 140 /* 141 ------------------------------------------------------------------------------- 142 Software IEC/IEEE single-precision conversion routines. 143 ------------------------------------------------------------------------------- 144 */ 145 int float32_to_int32( float32 ); 146 int float32_to_int32_round_to_zero( float32 ); 147 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 148 unsigned int float32_to_uint32_round_to_zero( float32 ); 149 #endif 150 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 151 long long float32_to_int64( float32 ); 152 long long float32_to_int64_round_to_zero( float32 ); 153 #endif 154 float64 float32_to_float64( float32 ); 155 #ifdef FLOATX80 156 floatx80 float32_to_floatx80( float32 ); 157 #endif 158 #ifdef FLOAT128 159 float128 float32_to_float128( float32 ); 160 #endif 161 162 /* 163 ------------------------------------------------------------------------------- 164 Software IEC/IEEE single-precision operations. 165 ------------------------------------------------------------------------------- 166 */ 167 float32 float32_round_to_int( float32 ); 168 float32 float32_add( float32, float32 ); 169 float32 float32_sub( float32, float32 ); 170 float32 float32_mul( float32, float32 ); 171 float32 float32_div( float32, float32 ); 172 float32 float32_rem( float32, float32 ); 173 float32 float32_sqrt( float32 ); 174 int float32_eq( float32, float32 ); 175 int float32_le( float32, float32 ); 176 int float32_lt( float32, float32 ); 177 int float32_eq_signaling( float32, float32 ); 178 int float32_le_quiet( float32, float32 ); 179 int float32_lt_quiet( float32, float32 ); 180 #ifndef SOFTFLOAT_FOR_GCC 181 int float32_is_signaling_nan( float32 ); 182 #endif 183 184 /* 185 ------------------------------------------------------------------------------- 186 Software IEC/IEEE double-precision conversion routines. 187 ------------------------------------------------------------------------------- 188 */ 189 int float64_to_int32( float64 ); 190 int float64_to_int32_round_to_zero( float64 ); 191 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 192 unsigned int float64_to_uint32_round_to_zero( float64 ); 193 #endif 194 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 195 long long float64_to_int64( float64 ); 196 long long float64_to_int64_round_to_zero( float64 ); 197 #endif 198 float32 float64_to_float32( float64 ); 199 #ifdef FLOATX80 200 floatx80 float64_to_floatx80( float64 ); 201 #endif 202 #ifdef FLOAT128 203 float128 float64_to_float128( float64 ); 204 #endif 205 206 /* 207 ------------------------------------------------------------------------------- 208 Software IEC/IEEE double-precision operations. 209 ------------------------------------------------------------------------------- 210 */ 211 float64 float64_round_to_int( float64 ); 212 float64 float64_add( float64, float64 ); 213 float64 float64_sub( float64, float64 ); 214 float64 float64_mul( float64, float64 ); 215 float64 float64_div( float64, float64 ); 216 float64 float64_rem( float64, float64 ); 217 float64 float64_sqrt( float64 ); 218 int float64_eq( float64, float64 ); 219 int float64_le( float64, float64 ); 220 int float64_lt( float64, float64 ); 221 int float64_eq_signaling( float64, float64 ); 222 int float64_le_quiet( float64, float64 ); 223 int float64_lt_quiet( float64, float64 ); 224 #ifndef SOFTFLOAT_FOR_GCC 225 int float64_is_signaling_nan( float64 ); 226 #endif 227 228 #ifdef FLOATX80 229 230 /* 231 ------------------------------------------------------------------------------- 232 Software IEC/IEEE extended double-precision conversion routines. 233 ------------------------------------------------------------------------------- 234 */ 235 int floatx80_to_int32( floatx80 ); 236 int floatx80_to_int32_round_to_zero( floatx80 ); 237 long long floatx80_to_int64( floatx80 ); 238 long long floatx80_to_int64_round_to_zero( floatx80 ); 239 float32 floatx80_to_float32( floatx80 ); 240 float64 floatx80_to_float64( floatx80 ); 241 #ifdef FLOAT128 242 float128 floatx80_to_float128( floatx80 ); 243 #endif 244 245 /* 246 ------------------------------------------------------------------------------- 247 Software IEC/IEEE extended double-precision rounding precision. Valid 248 values are 32, 64, and 80. 249 ------------------------------------------------------------------------------- 250 */ 251 extern int floatx80_rounding_precision; 252 253 /* 254 ------------------------------------------------------------------------------- 255 Software IEC/IEEE extended double-precision operations. 256 ------------------------------------------------------------------------------- 257 */ 258 floatx80 floatx80_round_to_int( floatx80 ); 259 floatx80 floatx80_add( floatx80, floatx80 ); 260 floatx80 floatx80_sub( floatx80, floatx80 ); 261 floatx80 floatx80_mul( floatx80, floatx80 ); 262 floatx80 floatx80_div( floatx80, floatx80 ); 263 floatx80 floatx80_rem( floatx80, floatx80 ); 264 floatx80 floatx80_sqrt( floatx80 ); 265 int floatx80_eq( floatx80, floatx80 ); 266 int floatx80_le( floatx80, floatx80 ); 267 int floatx80_lt( floatx80, floatx80 ); 268 int floatx80_eq_signaling( floatx80, floatx80 ); 269 int floatx80_le_quiet( floatx80, floatx80 ); 270 int floatx80_lt_quiet( floatx80, floatx80 ); 271 int floatx80_is_signaling_nan( floatx80 ); 272 273 #endif 274 275 #ifdef FLOAT128 276 277 /* 278 ------------------------------------------------------------------------------- 279 Software IEC/IEEE quadruple-precision conversion routines. 280 ------------------------------------------------------------------------------- 281 */ 282 int float128_to_int32( float128 ); 283 int float128_to_int32_round_to_zero( float128 ); 284 long long float128_to_int64( float128 ); 285 long long float128_to_int64_round_to_zero( float128 ); 286 float32 float128_to_float32( float128 ); 287 float64 float128_to_float64( float128 ); 288 #ifdef FLOATX80 289 floatx80 float128_to_floatx80( float128 ); 290 #endif 291 292 /* 293 ------------------------------------------------------------------------------- 294 Software IEC/IEEE quadruple-precision operations. 295 ------------------------------------------------------------------------------- 296 */ 297 float128 float128_round_to_int( float128 ); 298 float128 float128_add( float128, float128 ); 299 float128 float128_sub( float128, float128 ); 300 float128 float128_mul( float128, float128 ); 301 float128 float128_div( float128, float128 ); 302 float128 float128_rem( float128, float128 ); 303 float128 float128_sqrt( float128 ); 304 int float128_eq( float128, float128 ); 305 int float128_le( float128, float128 ); 306 int float128_lt( float128, float128 ); 307 int float128_eq_signaling( float128, float128 ); 308 int float128_le_quiet( float128, float128 ); 309 int float128_lt_quiet( float128, float128 ); 310 int float128_is_signaling_nan( float128 ); 311 312 #endif 313 314