1/* $OpenBSD: softfloat.h,v 1.3 2019/11/10 22:23:29 guenther Exp $ */ 2/* $NetBSD: softfloat.h,v 1.6 2002/05/12 13:12:46 bjh21 Exp $ */ 3 4/* This is a derivative work. */ 5 6/* 7=============================================================================== 8 9This C header file is part of the SoftFloat IEC/IEEE Floating-point 10Arithmetic Package, Release 2a. 11 12Written by John R. Hauser. This work was made possible in part by the 13International Computer Science Institute, located at Suite 600, 1947 Center 14Street, Berkeley, California 94704. Funding was partially provided by the 15National Science Foundation under grant MIP-9311980. The original version 16of this code was written as part of a project to build a fixed-point vector 17processor in collaboration with the University of California at Berkeley, 18overseen by Profs. Nelson Morgan and John Wawrzynek. More information 19is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ 20arithmetic/SoftFloat.html'. 21 22THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 23has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 24TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 25PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 26AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 27 28Derivative works are acceptable, even for commercial purposes, so long as 29(1) they include prominent notice that the work is derivative, and (2) they 30include prominent notice akin to these four paragraphs for those parts of 31this code that are retained. 32 33=============================================================================== 34*/ 35 36/* 37------------------------------------------------------------------------------- 38The macro `FLOATX80' must be defined to enable the extended double-precision 39floating-point format `floatx80'. If this macro is not defined, the 40`floatx80' type will not be defined, and none of the functions that either 41input or output the `floatx80' type will be defined. The same applies to 42the `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------------------------------------------------------------------------------- 52Software IEC/IEEE floating-point types. 53------------------------------------------------------------------------------- 54*/ 55typedef unsigned int float32; 56typedef unsigned long long float64; 57#ifdef FLOATX80 58typedef struct { 59 unsigned short high; 60 unsigned long long low; 61} floatx80; 62#endif 63#ifdef FLOAT128 64typedef struct { 65 unsigned long long high, low; 66} float128; 67#endif 68 69/* 70------------------------------------------------------------------------------- 71Software IEC/IEEE floating-point underflow tininess-detection mode. 72------------------------------------------------------------------------------- 73*/ 74#ifdef SOFTFLOAT_FOR_GCC 75static 76#endif 77int8 float_detect_tininess; 78enum { 79 float_tininess_after_rounding = 0, 80 float_tininess_before_rounding = 1 81}; 82 83/* 84------------------------------------------------------------------------------- 85Software IEC/IEEE floating-point rounding mode. 86------------------------------------------------------------------------------- 87*/ 88extern fp_rnd float_rounding_mode; 89enum { 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------------------------------------------------------------------------------- 98Software IEC/IEEE floating-point exception flags. 99------------------------------------------------------------------------------- 100*/ 101extern fp_except float_exception_flags; 102extern fp_except float_exception_mask; 103enum { 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------------------------------------------------------------------------------- 113Routine to raise any or all of the software IEC/IEEE floating-point 114exception flags. 115------------------------------------------------------------------------------- 116*/ 117void float_raise( fp_except ); 118 119/* 120------------------------------------------------------------------------------- 121Software IEC/IEEE integer-to-floating-point conversion routines. 122------------------------------------------------------------------------------- 123*/ 124float32 int32_to_float32( int ) __dso_protected; 125float64 int32_to_float64( int ) __dso_protected; 126#ifdef FLOATX80 127floatx80 int32_to_floatx80( int ) __dso_protected; 128#endif 129#ifdef FLOAT128 130float128 int32_to_float128( int ) __dso_protected; 131#endif 132#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 133float32 int64_to_float32( long long ) __dso_protected; 134float64 int64_to_float64( long long ) __dso_protected; 135#ifdef FLOATX80 136floatx80 int64_to_floatx80( long long ) __dso_protected; 137#endif 138#ifdef FLOAT128 139float128 int64_to_float128( long long ) __dso_protected; 140#endif 141#endif 142 143/* 144------------------------------------------------------------------------------- 145Software IEC/IEEE single-precision conversion routines. 146------------------------------------------------------------------------------- 147*/ 148int float32_to_int32( float32 ) __dso_protected; 149int float32_to_int32_round_to_zero( float32 ) __dso_protected; 150#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 151unsigned int float32_to_uint32_round_to_zero( float32 ) __dso_protected; 152#endif 153#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 154long long float32_to_int64( float32 ) __dso_protected; 155long long float32_to_int64_round_to_zero( float32 ) __dso_protected; 156#endif 157float64 float32_to_float64( float32 ) __dso_protected; 158#ifdef FLOATX80 159floatx80 float32_to_floatx80( float32 ) __dso_protected; 160#endif 161#ifdef FLOAT128 162float128 float32_to_float128( float32 ) __dso_protected; 163#endif 164 165/* 166------------------------------------------------------------------------------- 167Software IEC/IEEE single-precision operations. 168------------------------------------------------------------------------------- 169*/ 170float32 float32_round_to_int( float32 ) __dso_protected; 171float32 float32_add( float32, float32 ) __dso_protected; 172float32 float32_sub( float32, float32 ) __dso_protected; 173float32 float32_mul( float32, float32 ) __dso_protected; 174float32 float32_div( float32, float32 ) __dso_protected; 175float32 float32_rem( float32, float32 ) __dso_protected; 176float32 float32_sqrt( float32 ) __dso_protected; 177int float32_eq( float32, float32 ) __dso_protected; 178int float32_le( float32, float32 ) __dso_protected; 179int float32_lt( float32, float32 ) __dso_protected; 180int float32_eq_signaling( float32, float32 ) __dso_protected; 181int float32_le_quiet( float32, float32 ) __dso_protected; 182int float32_lt_quiet( float32, float32 ) __dso_protected; 183#ifndef SOFTFLOAT_FOR_GCC 184int float32_is_signaling_nan( float32 ) __dso_protected; 185#endif 186 187/* 188------------------------------------------------------------------------------- 189Software IEC/IEEE double-precision conversion routines. 190------------------------------------------------------------------------------- 191*/ 192int float64_to_int32( float64 ) __dso_protected; 193int float64_to_int32_round_to_zero( float64 ) __dso_protected; 194#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 195unsigned int float64_to_uint32_round_to_zero( float64 ) __dso_protected; 196#endif 197#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 198long long float64_to_int64( float64 ) __dso_protected; 199long long float64_to_int64_round_to_zero( float64 ) __dso_protected; 200#endif 201float32 float64_to_float32( float64 ) __dso_protected; 202#ifdef FLOATX80 203floatx80 float64_to_floatx80( float64 ) __dso_protected; 204#endif 205#ifdef FLOAT128 206float128 float64_to_float128( float64 ) __dso_protected; 207#endif 208 209/* 210------------------------------------------------------------------------------- 211Software IEC/IEEE double-precision operations. 212------------------------------------------------------------------------------- 213*/ 214float64 float64_round_to_int( float64 ) __dso_protected; 215float64 float64_add( float64, float64 ) __dso_protected; 216float64 float64_sub( float64, float64 ) __dso_protected; 217float64 float64_mul( float64, float64 ) __dso_protected; 218float64 float64_div( float64, float64 ) __dso_protected; 219float64 float64_rem( float64, float64 ) __dso_protected; 220float64 float64_sqrt( float64 ) __dso_protected; 221int float64_eq( float64, float64 ) __dso_protected; 222int float64_le( float64, float64 ) __dso_protected; 223int float64_lt( float64, float64 ) __dso_protected; 224int float64_eq_signaling( float64, float64 ) __dso_protected; 225int float64_le_quiet( float64, float64 ) __dso_protected; 226int float64_lt_quiet( float64, float64 ) __dso_protected; 227#ifndef SOFTFLOAT_FOR_GCC 228int float64_is_signaling_nan( float64 ) __dso_protected; 229#endif 230 231#ifdef FLOATX80 232 233/* 234------------------------------------------------------------------------------- 235Software IEC/IEEE extended double-precision conversion routines. 236------------------------------------------------------------------------------- 237*/ 238int floatx80_to_int32( floatx80 ) __dso_protected; 239int floatx80_to_int32_round_to_zero( floatx80 ) __dso_protected; 240long long floatx80_to_int64( floatx80 ) __dso_protected; 241long long floatx80_to_int64_round_to_zero( floatx80 ) __dso_protected; 242float32 floatx80_to_float32( floatx80 ) __dso_protected; 243float64 floatx80_to_float64( floatx80 ) __dso_protected; 244#ifdef FLOAT128 245float128 floatx80_to_float128( floatx80 ) __dso_protected; 246#endif 247 248/* 249------------------------------------------------------------------------------- 250Software IEC/IEEE extended double-precision rounding precision. Valid 251values are 32, 64, and 80. 252------------------------------------------------------------------------------- 253*/ 254extern int floatx80_rounding_precision; 255 256/* 257------------------------------------------------------------------------------- 258Software IEC/IEEE extended double-precision operations. 259------------------------------------------------------------------------------- 260*/ 261floatx80 floatx80_round_to_int( floatx80 ) __dso_protected; 262floatx80 floatx80_add( floatx80, floatx80 ) __dso_protected; 263floatx80 floatx80_sub( floatx80, floatx80 ) __dso_protected; 264floatx80 floatx80_mul( floatx80, floatx80 ) __dso_protected; 265floatx80 floatx80_div( floatx80, floatx80 ) __dso_protected; 266floatx80 floatx80_rem( floatx80, floatx80 ) __dso_protected; 267floatx80 floatx80_sqrt( floatx80 ) __dso_protected; 268int floatx80_eq( floatx80, floatx80 ) __dso_protected; 269int floatx80_le( floatx80, floatx80 ) __dso_protected; 270int floatx80_lt( floatx80, floatx80 ) __dso_protected; 271int floatx80_eq_signaling( floatx80, floatx80 ) __dso_protected; 272int floatx80_le_quiet( floatx80, floatx80 ) __dso_protected; 273int floatx80_lt_quiet( floatx80, floatx80 ) __dso_protected; 274int floatx80_is_signaling_nan( floatx80 ) __dso_protected; 275 276#endif 277 278#ifdef FLOAT128 279 280/* 281------------------------------------------------------------------------------- 282Software IEC/IEEE quadruple-precision conversion routines. 283------------------------------------------------------------------------------- 284*/ 285int float128_to_int32( float128 ) __dso_protected; 286int float128_to_int32_round_to_zero( float128 ) __dso_protected; 287long long float128_to_int64( float128 ) __dso_protected; 288long long float128_to_int64_round_to_zero( float128 ) __dso_protected; 289float32 float128_to_float32( float128 ) __dso_protected; 290float64 float128_to_float64( float128 ) __dso_protected; 291#ifdef FLOATX80 292floatx80 float128_to_floatx80( float128 ) __dso_protected; 293#endif 294 295/* 296------------------------------------------------------------------------------- 297Software IEC/IEEE quadruple-precision operations. 298------------------------------------------------------------------------------- 299*/ 300float128 float128_round_to_int( float128 ) __dso_protected; 301float128 float128_add( float128, float128 ) __dso_protected; 302float128 float128_sub( float128, float128 ) __dso_protected; 303float128 float128_mul( float128, float128 ) __dso_protected; 304float128 float128_div( float128, float128 ) __dso_protected; 305float128 float128_rem( float128, float128 ) __dso_protected; 306float128 float128_sqrt( float128 ) __dso_protected; 307int float128_eq( float128, float128 ) __dso_protected; 308int float128_le( float128, float128 ) __dso_protected; 309int float128_lt( float128, float128 ) __dso_protected; 310int float128_eq_signaling( float128, float128 ) __dso_protected; 311int float128_le_quiet( float128, float128 ) __dso_protected; 312int float128_lt_quiet( float128, float128 ) __dso_protected; 313int float128_is_signaling_nan( float128 ) __dso_protected; 314 315#endif 316 317