lib/libc/arch/m68k/softfloat/softfloat.h

   1 /*      $NetBSD: softfloat.h,v 1.7 2014/09/01 07:33:31 matt Exp $       */
   2
   3 /* This is a derivative work. */
   4
   5 /*
   6 ===============================================================================
   7
   8 This C header file is part of the SoftFloat IEC/IEEE Floating-point
   9 Arithmetic Package, Release 2a.
  10
  11 Written by John R. Hauser.  This work was made possible in part by the
  12 International Computer Science Institute, located at Suite 600, 1947 Center
  13 Street, Berkeley, California 94704.  Funding was partially provided by the
  14 National Science Foundation under grant MIP-9311980.  The original version
  15 of this code was written as part of a project to build a fixed-point vector
  16 processor in collaboration with the University of California at Berkeley,
  17 overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
  18 is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
  19 arithmetic/SoftFloat.html'.
  20
  21 THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort
  22 has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
  23 TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO
  24 PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
  25 AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
  26
  27 Derivative works are acceptable, even for commercial purposes, so long as
  28 (1) they include prominent notice that the work is derivative, and (2) they
  29 include prominent notice akin to these four paragraphs for those parts of
  30 this code that are retained.
  31
  32 ===============================================================================
  33 */
  34
  35 /*
  36 -------------------------------------------------------------------------------
  37 The macro `FLOATX80' must be defined to enable the extended double-precision
  38 floating-point format `floatx80'.  If this macro is not defined, the
  39 `floatx80' type will not be defined, and none of the functions that either
  40 input or output the `floatx80' type will be defined.  The same applies to
  41 the `FLOAT128' macro and the quadruple-precision format `float128'.
  42 -------------------------------------------------------------------------------
  43 */
  44 #ifndef __mcoldfire__
  45 #define FLOATX80
  46 #endif
  47 /* #define FLOAT128 */
  48
  49 #include <machine/ieeefp.h>
  50
  51 /*
  52 -------------------------------------------------------------------------------
  53 Software IEC/IEEE floating-point types.
  54 -------------------------------------------------------------------------------
  55 */
  56 typedef unsigned int float32;
  57 typedef unsigned long long float64;
  58 #ifdef FLOATX80
  59 typedef struct {
  60     unsigned short high;
  61     unsigned long long low;
  62 } floatx80;
  63 #endif
  64 #ifdef FLOAT128
  65 typedef struct {
  66     unsigned long long high, low;
  67 } float128;
  68 #endif
  69
  70 /*
  71 -------------------------------------------------------------------------------
  72 Software IEC/IEEE floating-point underflow tininess-detection mode.
  73 -------------------------------------------------------------------------------
  74 */
  75 #ifndef SOFTFLOAT_FOR_GCC
  76 extern int8 float_detect_tininess;
  77 #endif
  78 enum {
  79     float_tininess_after_rounding  = 0,
  80     float_tininess_before_rounding = 1
  81 };
  82
  83 /*
  84 -------------------------------------------------------------------------------
  85 Software IEC/IEEE floating-point rounding mode.
  86 -------------------------------------------------------------------------------
  87 */
  88 extern fp_rnd float_rounding_mode;
  89 #define float_round_nearest_even FP_RN
  90 #define float_round_to_zero      FP_RZ
  91 #define float_round_down         FP_RM
  92 #define float_round_up           FP_RP
  93
  94 /*
  95 -------------------------------------------------------------------------------
  96 Software IEC/IEEE floating-point exception flags.
  97 -------------------------------------------------------------------------------
  98 */
  99 extern fp_except float_exception_flags;
 100 extern fp_except float_exception_mask;
 101 enum {
 102     float_flag_inexact   = FP_X_IMP,
 103     float_flag_underflow = FP_X_UFL,
 104     float_flag_overflow  = FP_X_OFL,
 105     float_flag_divbyzero = FP_X_DZ,
 106     float_flag_invalid   = FP_X_INV
 107 };
 108
 109 /*
 110 -------------------------------------------------------------------------------
 111 Routine to raise any or all of the software IEC/IEEE floating-point
 112 exception flags.
 113 -------------------------------------------------------------------------------
 114 */
 115 void float_raise( fp_except );
 116
 117 /*
 118 -------------------------------------------------------------------------------
 119 Software IEC/IEEE integer-to-floating-point conversion routines.
 120 -------------------------------------------------------------------------------
 121 */
 122 float32 int32_to_float32( int32 );
 123 float32 uint32_to_float32( uint32 );
 124 float64 int32_to_float64( int32 );
 125 float64 uint32_to_float64( uint32 );
 126 #ifdef FLOATX80
 127 floatx80 int32_to_floatx80( int32 );
 128 floatx80 uint32_to_floatx80( uint32 );
 129 #endif
 130 #ifdef FLOAT128
 131 float128 int32_to_float128( int32 );
 132 float128 uint32_to_float128( uint32 );
 133 #endif
 134 float32 int64_to_float32( long long );
 135 float64 int64_to_float64( long long );
 136 #ifdef FLOATX80
 137 floatx80 int64_to_floatx80( long long );
 138 #endif
 139 #ifdef FLOAT128
 140 float128 int64_to_float128( long long );
 141 #endif
 142
 143 /*
 144 -------------------------------------------------------------------------------
 145 Software IEC/IEEE single-precision conversion routines.
 146 -------------------------------------------------------------------------------
 147 */
 148 int float32_to_int32( float32 );
 149 int float32_to_int32_round_to_zero( float32 );
 150 unsigned int float32_to_uint32_round_to_zero( float32 );
 151 long long float32_to_int64( float32 );
 152 long long float32_to_int64_round_to_zero( float32 );
 153 float64 float32_to_float64( float32 );
 154 #ifdef FLOATX80
 155 floatx80 float32_to_floatx80( float32 );
 156 #endif
 157 #ifdef FLOAT128
 158 float128 float32_to_float128( float32 );
 159 #endif
 160
 161 /*
 162 -------------------------------------------------------------------------------
 163 Software IEC/IEEE single-precision operations.
 164 -------------------------------------------------------------------------------
 165 */
 166 float32 float32_round_to_int( float32 );
 167 float32 float32_add( float32, float32 );
 168 float32 float32_sub( float32, float32 );
 169 float32 float32_mul( float32, float32 );
 170 float32 float32_div( float32, float32 );
 171 float32 float32_rem( float32, float32 );
 172 float32 float32_sqrt( float32 );
 173 flag float32_eq( float32, float32 );
 174 flag float32_le( float32, float32 );
 175 flag float32_lt( float32, float32 );
 176 flag float32_eq_signaling( float32, float32 );
 177 flag float32_le_quiet( float32, float32 );
 178 flag float32_lt_quiet( float32, float32 );
 179 #if !defined(SOFTFLOAT_FOR_GCC) || defined(SOFTFLOATM68K_FOR_GCC)
 180 flag float32_is_signaling_nan( float32 );
 181 #endif
 182
 183 /*
 184 -------------------------------------------------------------------------------
 185 Software IEC/IEEE double-precision conversion routines.
 186 -------------------------------------------------------------------------------
 187 */
 188 int float64_to_int32( float64 );
 189 int float64_to_int32_round_to_zero( float64 );
 190 unsigned int float64_to_uint32_round_to_zero( float64 );
 191 long long float64_to_int64( float64 );
 192 long long float64_to_int64_round_to_zero( float64 );
 193 float32 float64_to_float32( float64 );
 194 #ifdef FLOATX80
 195 floatx80 float64_to_floatx80( float64 );
 196 #endif
 197 #ifdef FLOAT128
 198 float128 float64_to_float128( float64 );
 199 #endif
 200
 201 /*
 202 -------------------------------------------------------------------------------
 203 Software IEC/IEEE double-precision operations.
 204 -------------------------------------------------------------------------------
 205 */
 206 float64 float64_round_to_int( float64 );
 207 float64 float64_add( float64, float64 );
 208 float64 float64_sub( float64, float64 );
 209 float64 float64_mul( float64, float64 );
 210 float64 float64_div( float64, float64 );
 211 float64 float64_rem( float64, float64 );
 212 float64 float64_sqrt( float64 );
 213 flag float64_eq( float64, float64 );
 214 flag float64_le( float64, float64 );
 215 flag float64_lt( float64, float64 );
 216 flag float64_eq_signaling( float64, float64 );
 217 flag float64_le_quiet( float64, float64 );
 218 flag float64_lt_quiet( float64, float64 );
 219 flag float64_is_signaling_nan( float64 );
 220
 221 #ifdef FLOATX80
 222
 223 /*
 224 -------------------------------------------------------------------------------
 225 Software IEC/IEEE extended double-precision conversion routines.
 226 -------------------------------------------------------------------------------
 227 */
 228 int floatx80_to_int32( floatx80 );
 229 int floatx80_to_int32_round_to_zero( floatx80 );
 230 long long floatx80_to_int64( floatx80 );
 231 long long floatx80_to_int64_round_to_zero( floatx80 );
 232 float32 floatx80_to_float32( floatx80 );
 233 float64 floatx80_to_float64( floatx80 );
 234 #ifdef FLOAT128
 235 float128 floatx80_to_float128( floatx80 );
 236 #endif
 237
 238 /*
 239 -------------------------------------------------------------------------------
 240 Software IEC/IEEE extended double-precision rounding precision.  Valid
 241 values are 32, 64, and 80.
 242 -------------------------------------------------------------------------------
 243 */
 244 extern int floatx80_rounding_precision;
 245
 246 /*
 247 -------------------------------------------------------------------------------
 248 Software IEC/IEEE extended double-precision operations.
 249 -------------------------------------------------------------------------------
 250 */
 251 floatx80 floatx80_round_to_int( floatx80 );
 252 floatx80 floatx80_add( floatx80, floatx80 );
 253 floatx80 floatx80_sub( floatx80, floatx80 );
 254 floatx80 floatx80_mul( floatx80, floatx80 );
 255 floatx80 floatx80_div( floatx80, floatx80 );
 256 floatx80 floatx80_rem( floatx80, floatx80 );
 257 floatx80 floatx80_sqrt( floatx80 );
 258 flag floatx80_eq( floatx80, floatx80 );
 259 flag floatx80_le( floatx80, floatx80 );
 260 flag floatx80_lt( floatx80, floatx80 );
 261 flag floatx80_eq_signaling( floatx80, floatx80 );
 262 flag floatx80_le_quiet( floatx80, floatx80 );
 263 flag floatx80_lt_quiet( floatx80, floatx80 );
 264 flag floatx80_is_signaling_nan( floatx80 );
 265 flag floatx80_is_nan( floatx80 );
 266
 267 #endif
 268
 269 #ifdef FLOAT128
 270
 271 /*
 272 -------------------------------------------------------------------------------
 273 Software IEC/IEEE quadruple-precision conversion routines.
 274 -------------------------------------------------------------------------------
 275 */
 276 int float128_to_int32( float128 );
 277 int float128_to_int32_round_to_zero( float128 );
 278 long long float128_to_int64( float128 );
 279 long long float128_to_int64_round_to_zero( float128 );
 280 float32 float128_to_float32( float128 );
 281 float64 float128_to_float64( float128 );
 282 #ifdef FLOATX80
 283 floatx80 float128_to_floatx80( float128 );
 284 #endif
 285
 286 /*
 287 -------------------------------------------------------------------------------
 288 Software IEC/IEEE quadruple-precision operations.
 289 -------------------------------------------------------------------------------
 290 */
 291 float128 float128_round_to_int( float128 );
 292 float128 float128_add( float128, float128 );
 293 float128 float128_sub( float128, float128 );
 294 float128 float128_mul( float128, float128 );
 295 float128 float128_div( float128, float128 );
 296 float128 float128_rem( float128, float128 );
 297 float128 float128_sqrt( float128 );
 298 flag float128_eq( float128, float128 );
 299 flag float128_le( float128, float128 );
 300 flag float128_lt( float128, float128 );
 301 flag float128_eq_signaling( float128, float128 );
 302 flag float128_le_quiet( float128, float128 );
 303 flag float128_lt_quiet( float128, float128 );
 304 flag float128_is_signaling_nan( float128 );
 305
 306 #endif