1 /* $NetBSD: softfloat.h,v 1.5 2008/04/28 20:23:04 martin Exp $ */ 2 3 /* This is a derivative work. */ 4 5 /*- 6 * Copyright (c) 2001 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Ross Harvey. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 =============================================================================== 36 37 This C header file is part of the SoftFloat IEC/IEEE Floating-point 38 Arithmetic Package, Release 2a. 39 40 Written by John R. Hauser. This work was made possible in part by the 41 International Computer Science Institute, located at Suite 600, 1947 Center 42 Street, Berkeley, California 94704. Funding was partially provided by the 43 National Science Foundation under grant MIP-9311980. The original version 44 of this code was written as part of a project to build a fixed-point vector 45 processor in collaboration with the University of California at Berkeley, 46 overseen by Profs. Nelson Morgan and John Wawrzynek. More information 47 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 48 arithmetic/SoftFloat.html'. 49 50 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 51 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 52 TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 53 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 54 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 55 56 Derivative works are acceptable, even for commercial purposes, so long as 57 (1) they include prominent notice that the work is derivative, and (2) they 58 include prominent notice akin to these four paragraphs for those parts of 59 this code that are retained. 60 61 =============================================================================== 62 */ 63 64 #include <ieeefp.h> 65 #include <inttypes.h> 66 #include <sys/endian.h> 67 68 /* 69 ------------------------------------------------------------------------------- 70 The macro `FLOATX80' must be defined to enable the extended double-precision 71 floating-point format `floatx80'. If this macro is not defined, the 72 `floatx80' type will not be defined, and none of the functions that either 73 input or output the `floatx80' type will be defined. The same applies to 74 the `FLOAT128' macro and the quadruple-precision format `float128'. 75 ------------------------------------------------------------------------------- 76 */ 77 /* #define FLOATX80 */ 78 /* #define FLOAT128 */ 79 80 /* 81 ------------------------------------------------------------------------------- 82 Software IEC/IEEE floating-point types. 83 ------------------------------------------------------------------------------- 84 */ 85 typedef uint32_t float32; 86 typedef uint64_t float64; 87 #ifdef FLOATX80 88 typedef struct { 89 #if BYTE_ORDER == BIG_ENDIAN 90 uint16_t high; 91 uint64_t low; 92 #else 93 uint64_t low; 94 uint16_t high; 95 #endif 96 } floatx80; 97 #endif 98 #ifdef FLOAT128 99 typedef struct { 100 uint64_t high, low; 101 } float128; 102 #endif 103 104 /* 105 ------------------------------------------------------------------------------- 106 Software IEC/IEEE floating-point underflow tininess-detection mode. 107 ------------------------------------------------------------------------------- 108 */ 109 extern int float_detect_tininess; 110 enum { 111 float_tininess_after_rounding = 0, 112 float_tininess_before_rounding = 1 113 }; 114 115 /* 116 ------------------------------------------------------------------------------- 117 Software IEC/IEEE floating-point rounding mode. 118 ------------------------------------------------------------------------------- 119 */ 120 extern fp_rnd float_rounding_mode; 121 enum { 122 float_round_nearest_even = FP_RN, 123 float_round_to_zero = FP_RZ, 124 float_round_down = FP_RM, 125 float_round_up = FP_RP 126 }; 127 128 /* 129 ------------------------------------------------------------------------------- 130 Software IEC/IEEE floating-point exception flags. 131 ------------------------------------------------------------------------------- 132 */ 133 extern fp_except float_exception_flags; 134 enum { 135 float_flag_inexact = FP_X_IMP, 136 float_flag_underflow = FP_X_UFL, 137 float_flag_overflow = FP_X_OFL, 138 float_flag_divbyzero = FP_X_DZ, 139 float_flag_invalid = FP_X_INV 140 }; 141 142 /* 143 ------------------------------------------------------------------------------- 144 Routine to raise any or all of the software IEC/IEEE floating-point 145 exception flags. 146 ------------------------------------------------------------------------------- 147 */ 148 void float_raise( int ); 149 150 /* 151 ------------------------------------------------------------------------------- 152 Software IEC/IEEE integer-to-floating-point conversion routines. 153 ------------------------------------------------------------------------------- 154 */ 155 float32 int32_to_float32( int ); 156 float64 int32_to_float64( int ); 157 #ifdef FLOATX80 158 floatx80 int32_to_floatx80( int ); 159 #endif 160 #ifdef FLOAT128 161 float128 int32_to_float128( int ); 162 #endif 163 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 164 float32 int64_to_float32( int64_t ); 165 float64 int64_to_float64( int64_t ); 166 #ifdef FLOATX80 167 floatx80 int64_to_floatx80( int64_t ); 168 #endif 169 #ifdef FLOAT128 170 float128 int64_to_float128( int64_t ); 171 #endif 172 #endif 173 174 /* 175 ------------------------------------------------------------------------------- 176 Software IEC/IEEE single-precision conversion routines. 177 ------------------------------------------------------------------------------- 178 */ 179 int float32_to_int32( float32 ); 180 int float32_to_int32_round_to_zero( float32 ); 181 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 182 int64_t float32_to_int64( float32 ); 183 int64_t float32_to_int64_round_to_zero( float32 ); 184 #endif 185 float64 float32_to_float64( float32 ); 186 #ifdef FLOATX80 187 floatx80 float32_to_floatx80( float32 ); 188 #endif 189 #ifdef FLOAT128 190 float128 float32_to_float128( float32 ); 191 #endif 192 193 /* 194 ------------------------------------------------------------------------------- 195 Software IEC/IEEE single-precision operations. 196 ------------------------------------------------------------------------------- 197 */ 198 float32 float32_round_to_int( float32 ); 199 float32 float32_add( float32, float32 ); 200 float32 float32_sub( float32, float32 ); 201 float32 float32_mul( float32, float32 ); 202 float32 float32_div( float32, float32 ); 203 float32 float32_rem( float32, float32 ); 204 float32 float32_sqrt( float32 ); 205 int float32_eq( float32, float32 ); 206 int float32_le( float32, float32 ); 207 int float32_lt( float32, float32 ); 208 int float32_eq_signaling( float32, float32 ); 209 int float32_le_quiet( float32, float32 ); 210 int float32_lt_quiet( float32, float32 ); 211 #ifndef SOFTFLOAT_FOR_GCC 212 int float32_is_signaling_nan( float32 ); 213 #endif 214 215 /* 216 ------------------------------------------------------------------------------- 217 Software IEC/IEEE double-precision conversion routines. 218 ------------------------------------------------------------------------------- 219 */ 220 int float64_to_int32( float64 ); 221 int float64_to_int32_round_to_zero( float64 ); 222 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 223 int64_t float64_to_int64( float64 ); 224 int64_t float64_to_int64_round_to_zero( float64 ); 225 #endif 226 float32 float64_to_float32( float64 ); 227 #ifdef FLOATX80 228 floatx80 float64_to_floatx80( float64 ); 229 #endif 230 #ifdef FLOAT128 231 float128 float64_to_float128( float64 ); 232 #endif 233 234 /* 235 ------------------------------------------------------------------------------- 236 Software IEC/IEEE double-precision operations. 237 ------------------------------------------------------------------------------- 238 */ 239 float64 float64_round_to_int( float64 ); 240 float64 float64_add( float64, float64 ); 241 float64 float64_sub( float64, float64 ); 242 float64 float64_mul( float64, float64 ); 243 float64 float64_div( float64, float64 ); 244 float64 float64_rem( float64, float64 ); 245 float64 float64_sqrt( float64 ); 246 int float64_eq( float64, float64 ); 247 int float64_le( float64, float64 ); 248 int float64_lt( float64, float64 ); 249 int float64_eq_signaling( float64, float64 ); 250 int float64_le_quiet( float64, float64 ); 251 int float64_lt_quiet( float64, float64 ); 252 #ifndef SOFTFLOAT_FOR_GCC 253 int float64_is_signaling_nan( float64 ); 254 #endif 255 256 #ifdef FLOATX80 257 258 /* 259 ------------------------------------------------------------------------------- 260 Software IEC/IEEE extended double-precision conversion routines. 261 ------------------------------------------------------------------------------- 262 */ 263 int floatx80_to_int32( floatx80 ); 264 int floatx80_to_int32_round_to_zero( floatx80 ); 265 int64_t floatx80_to_int64( floatx80 ); 266 int64_t floatx80_to_int64_round_to_zero( floatx80 ); 267 float32 floatx80_to_float32( floatx80 ); 268 float64 floatx80_to_float64( floatx80 ); 269 #ifdef FLOAT128 270 float128 floatx80_to_float128( floatx80 ); 271 #endif 272 273 /* 274 ------------------------------------------------------------------------------- 275 Software IEC/IEEE extended double-precision rounding precision. Valid 276 values are 32, 64, and 80. 277 ------------------------------------------------------------------------------- 278 */ 279 extern int floatx80_rounding_precision; 280 281 /* 282 ------------------------------------------------------------------------------- 283 Software IEC/IEEE extended double-precision operations. 284 ------------------------------------------------------------------------------- 285 */ 286 floatx80 floatx80_round_to_int( floatx80 ); 287 floatx80 floatx80_add( floatx80, floatx80 ); 288 floatx80 floatx80_sub( floatx80, floatx80 ); 289 floatx80 floatx80_mul( floatx80, floatx80 ); 290 floatx80 floatx80_div( floatx80, floatx80 ); 291 floatx80 floatx80_rem( floatx80, floatx80 ); 292 floatx80 floatx80_sqrt( floatx80 ); 293 int floatx80_eq( floatx80, floatx80 ); 294 int floatx80_le( floatx80, floatx80 ); 295 int floatx80_lt( floatx80, floatx80 ); 296 int floatx80_eq_signaling( floatx80, floatx80 ); 297 int floatx80_le_quiet( floatx80, floatx80 ); 298 int floatx80_lt_quiet( floatx80, floatx80 ); 299 int floatx80_is_signaling_nan( floatx80 ); 300 301 #endif 302 303 #ifdef FLOAT128 304 305 /* 306 ------------------------------------------------------------------------------- 307 Software IEC/IEEE quadruple-precision conversion routines. 308 ------------------------------------------------------------------------------- 309 */ 310 int float128_to_int32( float128 ); 311 int float128_to_int32_round_to_zero( float128 ); 312 int64_t float128_to_int64( float128 ); 313 int64_t float128_to_int64_round_to_zero( float128 ); 314 float32 float128_to_float32( float128 ); 315 float64 float128_to_float64( float128 ); 316 #ifdef FLOATX80 317 floatx80 float128_to_floatx80( float128 ); 318 #endif 319 320 /* 321 ------------------------------------------------------------------------------- 322 Software IEC/IEEE quadruple-precision operations. 323 ------------------------------------------------------------------------------- 324 */ 325 float128 float128_round_to_int( float128 ); 326 float128 float128_add( float128, float128 ); 327 float128 float128_sub( float128, float128 ); 328 float128 float128_mul( float128, float128 ); 329 float128 float128_div( float128, float128 ); 330 float128 float128_rem( float128, float128 ); 331 float128 float128_sqrt( float128 ); 332 int float128_eq( float128, float128 ); 333 int float128_le( float128, float128 ); 334 int float128_lt( float128, float128 ); 335 int float128_eq_signaling( float128, float128 ); 336 int float128_le_quiet( float128, float128 ); 337 int float128_lt_quiet( float128, float128 ); 338 int float128_is_signaling_nan( float128 ); 339 340 #endif 341 342
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