softfloat.h revision 230189
1/* $NetBSD: softfloat.h,v 1.6 2002/05/12 13:12:46 bjh21 Exp $ */ 2/* $FreeBSD: head/lib/libc/arm/softfloat/softfloat.h 230189 2012-01-16 04:05:53Z das $ */ 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 <fenv.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#ifndef SOFTFLOAT_FOR_GCC 75extern int float_detect_tininess; 76#endif 77enum { 78 float_tininess_after_rounding = 0, 79 float_tininess_before_rounding = 1 80}; 81 82/* 83------------------------------------------------------------------------------- 84Software IEC/IEEE floating-point rounding mode. 85------------------------------------------------------------------------------- 86*/ 87extern int float_rounding_mode; 88enum { 89 float_round_nearest_even = FE_TONEAREST, 90 float_round_to_zero = FE_TOWARDZERO, 91 float_round_down = FE_DOWNWARD, 92 float_round_up = FE_UPWARD 93}; 94 95/* 96------------------------------------------------------------------------------- 97Software IEC/IEEE floating-point exception flags. 98------------------------------------------------------------------------------- 99*/ 100extern int float_exception_flags; 101extern int float_exception_mask; 102enum { 103 float_flag_inexact = FE_INEXACT, 104 float_flag_underflow = FE_UNDERFLOW, 105 float_flag_overflow = FE_OVERFLOW, 106 float_flag_divbyzero = FE_DIVBYZERO, 107 float_flag_invalid = FE_INVALID 108}; 109 110/* 111------------------------------------------------------------------------------- 112Routine to raise any or all of the software IEC/IEEE floating-point 113exception flags. 114------------------------------------------------------------------------------- 115*/ 116void float_raise( int ); 117 118/* 119------------------------------------------------------------------------------- 120Software IEC/IEEE integer-to-floating-point conversion routines. 121------------------------------------------------------------------------------- 122*/ 123float32 int32_to_float32( int ); 124float64 int32_to_float64( int ); 125#ifdef FLOATX80 126floatx80 int32_to_floatx80( int ); 127#endif 128#ifdef FLOAT128 129float128 int32_to_float128( int ); 130#endif 131#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ 132float32 int64_to_float32( long long ); 133float64 int64_to_float64( long long ); 134#ifdef FLOATX80 135floatx80 int64_to_floatx80( long long ); 136#endif 137#ifdef FLOAT128 138float128 int64_to_float128( long long ); 139#endif 140#endif 141 142/* 143------------------------------------------------------------------------------- 144Software IEC/IEEE single-precision conversion routines. 145------------------------------------------------------------------------------- 146*/ 147int float32_to_int32( float32 ); 148int float32_to_int32_round_to_zero( float32 ); 149#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 150unsigned int float32_to_uint32_round_to_zero( float32 ); 151#endif 152#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 153long long float32_to_int64( float32 ); 154long long float32_to_int64_round_to_zero( float32 ); 155#endif 156float64 float32_to_float64( float32 ); 157#ifdef FLOATX80 158floatx80 float32_to_floatx80( float32 ); 159#endif 160#ifdef FLOAT128 161float128 float32_to_float128( float32 ); 162#endif 163 164/* 165------------------------------------------------------------------------------- 166Software IEC/IEEE single-precision operations. 167------------------------------------------------------------------------------- 168*/ 169float32 float32_round_to_int( float32 ); 170float32 float32_add( float32, float32 ); 171float32 float32_sub( float32, float32 ); 172float32 float32_mul( float32, float32 ); 173float32 float32_div( float32, float32 ); 174float32 float32_rem( float32, float32 ); 175float32 float32_sqrt( float32 ); 176int float32_eq( float32, float32 ); 177int float32_le( float32, float32 ); 178int float32_lt( float32, float32 ); 179int float32_eq_signaling( float32, float32 ); 180int float32_le_quiet( float32, float32 ); 181int float32_lt_quiet( float32, float32 ); 182#ifndef SOFTFLOAT_FOR_GCC 183int float32_is_signaling_nan( float32 ); 184#endif 185 186/* 187------------------------------------------------------------------------------- 188Software IEC/IEEE double-precision conversion routines. 189------------------------------------------------------------------------------- 190*/ 191int float64_to_int32( float64 ); 192int float64_to_int32_round_to_zero( float64 ); 193#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS) 194unsigned int float64_to_uint32_round_to_zero( float64 ); 195#endif 196#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ 197long long float64_to_int64( float64 ); 198long long float64_to_int64_round_to_zero( float64 ); 199#endif 200float32 float64_to_float32( float64 ); 201#ifdef FLOATX80 202floatx80 float64_to_floatx80( float64 ); 203#endif 204#ifdef FLOAT128 205float128 float64_to_float128( float64 ); 206#endif 207 208/* 209------------------------------------------------------------------------------- 210Software IEC/IEEE double-precision operations. 211------------------------------------------------------------------------------- 212*/ 213float64 float64_round_to_int( float64 ); 214float64 float64_add( float64, float64 ); 215float64 float64_sub( float64, float64 ); 216float64 float64_mul( float64, float64 ); 217float64 float64_div( float64, float64 ); 218float64 float64_rem( float64, float64 ); 219float64 float64_sqrt( float64 ); 220int float64_eq( float64, float64 ); 221int float64_le( float64, float64 ); 222int float64_lt( float64, float64 ); 223int float64_eq_signaling( float64, float64 ); 224int float64_le_quiet( float64, float64 ); 225int float64_lt_quiet( float64, float64 ); 226#ifndef SOFTFLOAT_FOR_GCC 227int float64_is_signaling_nan( float64 ); 228#endif 229 230#ifdef FLOATX80 231 232/* 233------------------------------------------------------------------------------- 234Software IEC/IEEE extended double-precision conversion routines. 235------------------------------------------------------------------------------- 236*/ 237int floatx80_to_int32( floatx80 ); 238int floatx80_to_int32_round_to_zero( floatx80 ); 239long long floatx80_to_int64( floatx80 ); 240long long floatx80_to_int64_round_to_zero( floatx80 ); 241float32 floatx80_to_float32( floatx80 ); 242float64 floatx80_to_float64( floatx80 ); 243#ifdef FLOAT128 244float128 floatx80_to_float128( floatx80 ); 245#endif 246 247/* 248------------------------------------------------------------------------------- 249Software IEC/IEEE extended double-precision rounding precision. Valid 250values are 32, 64, and 80. 251------------------------------------------------------------------------------- 252*/ 253extern int floatx80_rounding_precision; 254 255/* 256------------------------------------------------------------------------------- 257Software IEC/IEEE extended double-precision operations. 258------------------------------------------------------------------------------- 259*/ 260floatx80 floatx80_round_to_int( floatx80 ); 261floatx80 floatx80_add( floatx80, floatx80 ); 262floatx80 floatx80_sub( floatx80, floatx80 ); 263floatx80 floatx80_mul( floatx80, floatx80 ); 264floatx80 floatx80_div( floatx80, floatx80 ); 265floatx80 floatx80_rem( floatx80, floatx80 ); 266floatx80 floatx80_sqrt( floatx80 ); 267int floatx80_eq( floatx80, floatx80 ); 268int floatx80_le( floatx80, floatx80 ); 269int floatx80_lt( floatx80, floatx80 ); 270int floatx80_eq_signaling( floatx80, floatx80 ); 271int floatx80_le_quiet( floatx80, floatx80 ); 272int floatx80_lt_quiet( floatx80, floatx80 ); 273int floatx80_is_signaling_nan( floatx80 ); 274 275#endif 276 277#ifdef FLOAT128 278 279/* 280------------------------------------------------------------------------------- 281Software IEC/IEEE quadruple-precision conversion routines. 282------------------------------------------------------------------------------- 283*/ 284int float128_to_int32( float128 ); 285int float128_to_int32_round_to_zero( float128 ); 286long long float128_to_int64( float128 ); 287long long float128_to_int64_round_to_zero( float128 ); 288float32 float128_to_float32( float128 ); 289float64 float128_to_float64( float128 ); 290#ifdef FLOATX80 291floatx80 float128_to_floatx80( float128 ); 292#endif 293 294/* 295------------------------------------------------------------------------------- 296Software IEC/IEEE quadruple-precision operations. 297------------------------------------------------------------------------------- 298*/ 299float128 float128_round_to_int( float128 ); 300float128 float128_add( float128, float128 ); 301float128 float128_sub( float128, float128 ); 302float128 float128_mul( float128, float128 ); 303float128 float128_div( float128, float128 ); 304float128 float128_rem( float128, float128 ); 305float128 float128_sqrt( float128 ); 306int float128_eq( float128, float128 ); 307int float128_le( float128, float128 ); 308int float128_lt( float128, float128 ); 309int float128_eq_signaling( float128, float128 ); 310int float128_le_quiet( float128, float128 ); 311int float128_lt_quiet( float128, float128 ); 312int float128_is_signaling_nan( float128 ); 313 314#endif 315 316