lib/libc/arch/arm/softfloat/softfloat.h

   1 /*      $NetBSD: softfloat.h,v 1.10 2013/04/24 18:04:46 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 /* #define FLOATX80 */
  45 /* #define FLOAT128 */
  46
  47 #include <stdint.h>
  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 #ifndef SOFTFLOAT_FOR_GCC
  75 extern int float_detect_tininess;
  76 #endif
  77 enum {
  78     float_tininess_after_rounding  = 0,
  79     float_tininess_before_rounding = 1
  80 };
  81
  82 /*
  83 -------------------------------------------------------------------------------
  84 Software IEC/IEEE floating-point rounding mode.
  85 -------------------------------------------------------------------------------
  86 */
  87 extern fp_rnd float_rounding_mode;
  88 #define float_round_nearest_even FP_RN
  89 #define float_round_to_zero      FP_RZ
  90 #define float_round_down         FP_RM
  91 #define float_round_up           FP_RP
  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( int32 );
 122 float32 uint32_to_float32( uint32 );
 123 float64 int32_to_float64( int32 );
 124 float64 uint32_to_float64( uint32 );
 125 #ifdef FLOATX80
 126 floatx80 int32_to_floatx80( int32 );
 127 floatx80 uint32_to_floatx80( uint32 );
 128 #endif
 129 #ifdef FLOAT128
 130 float128 int32_to_float128( int32 );
 131 float128 uint32_to_float128( uint32 );
 132 #endif
 133 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
 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 #endif
 143
 144 /*
 145 -------------------------------------------------------------------------------
 146 Software IEC/IEEE single-precision conversion routines.
 147 -------------------------------------------------------------------------------
 148 */
 149 int float32_to_int32( float32 );
 150 int float32_to_int32_round_to_zero( float32 );
 151 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
 152 unsigned int float32_to_uint32_round_to_zero( float32 );
 153 #endif
 154 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
 155 long long float32_to_int64( float32 );
 156 long long float32_to_int64_round_to_zero( float32 );
 157 #endif
 158 float64 float32_to_float64( float32 );
 159 #ifdef FLOATX80
 160 floatx80 float32_to_floatx80( float32 );
 161 #endif
 162 #ifdef FLOAT128
 163 float128 float32_to_float128( float32 );
 164 #endif
 165
 166 /*
 167 -------------------------------------------------------------------------------
 168 Software IEC/IEEE single-precision operations.
 169 -------------------------------------------------------------------------------
 170 */
 171 float32 float32_round_to_int( float32 );
 172 float32 float32_add( float32, float32 );
 173 float32 float32_sub( float32, float32 );
 174 float32 float32_mul( float32, float32 );
 175 float32 float32_div( float32, float32 );
 176 float32 float32_rem( float32, float32 );
 177 float32 float32_sqrt( float32 );
 178 int float32_eq( float32, float32 );
 179 int float32_le( float32, float32 );
 180 int float32_lt( float32, float32 );
 181 int float32_eq_signaling( float32, float32 );
 182 int float32_le_quiet( float32, float32 );
 183 int float32_lt_quiet( float32, float32 );
 184 #ifndef SOFTFLOAT_FOR_GCC
 185 int float32_is_signaling_nan( float32 );
 186 #endif
 187
 188 /*
 189 -------------------------------------------------------------------------------
 190 Software IEC/IEEE double-precision conversion routines.
 191 -------------------------------------------------------------------------------
 192 */
 193 int float64_to_int32( float64 );
 194 int float64_to_int32_round_to_zero( float64 );
 195 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
 196 unsigned int float64_to_uint32_round_to_zero( float64 );
 197 #endif
 198 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
 199 long long float64_to_int64( float64 );
 200 long long float64_to_int64_round_to_zero( float64 );
 201 #endif
 202 float32 float64_to_float32( float64 );
 203 #ifdef FLOATX80
 204 floatx80 float64_to_floatx80( float64 );
 205 #endif
 206 #ifdef FLOAT128
 207 float128 float64_to_float128( float64 );
 208 #endif
 209
 210 /*
 211 -------------------------------------------------------------------------------
 212 Software IEC/IEEE double-precision operations.
 213 -------------------------------------------------------------------------------
 214 */
 215 float64 float64_round_to_int( float64 );
 216 float64 float64_add( float64, float64 );
 217 float64 float64_sub( float64, float64 );
 218 float64 float64_mul( float64, float64 );
 219 float64 float64_div( float64, float64 );
 220 float64 float64_rem( float64, float64 );
 221 float64 float64_sqrt( float64 );
 222 int float64_eq( float64, float64 );
 223 int float64_le( float64, float64 );
 224 int float64_lt( float64, float64 );
 225 int float64_eq_signaling( float64, float64 );
 226 int float64_le_quiet( float64, float64 );
 227 int float64_lt_quiet( float64, float64 );
 228 #ifndef SOFTFLOAT_FOR_GCC
 229 int float64_is_signaling_nan( float64 );
 230 #endif
 231
 232 #ifdef FLOATX80
 233
 234 /*
 235 -------------------------------------------------------------------------------
 236 Software IEC/IEEE extended double-precision conversion routines.
 237 -------------------------------------------------------------------------------
 238 */
 239 int floatx80_to_int32( floatx80 );
 240 int floatx80_to_int32_round_to_zero( floatx80 );
 241 long long floatx80_to_int64( floatx80 );
 242 long long floatx80_to_int64_round_to_zero( floatx80 );
 243 float32 floatx80_to_float32( floatx80 );
 244 float64 floatx80_to_float64( floatx80 );
 245 #ifdef FLOAT128
 246 float128 floatx80_to_float128( floatx80 );
 247 #endif
 248
 249 /*
 250 -------------------------------------------------------------------------------
 251 Software IEC/IEEE extended double-precision rounding precision.  Valid
 252 values are 32, 64, and 80.
 253 -------------------------------------------------------------------------------
 254 */
 255 extern int floatx80_rounding_precision;
 256
 257 /*
 258 -------------------------------------------------------------------------------
 259 Software IEC/IEEE extended double-precision operations.
 260 -------------------------------------------------------------------------------
 261 */
 262 floatx80 floatx80_round_to_int( floatx80 );
 263 floatx80 floatx80_add( floatx80, floatx80 );
 264 floatx80 floatx80_sub( floatx80, floatx80 );
 265 floatx80 floatx80_mul( floatx80, floatx80 );
 266 floatx80 floatx80_div( floatx80, floatx80 );
 267 floatx80 floatx80_rem( floatx80, floatx80 );
 268 floatx80 floatx80_sqrt( floatx80 );
 269 int floatx80_eq( floatx80, floatx80 );
 270 int floatx80_le( floatx80, floatx80 );
 271 int floatx80_lt( floatx80, floatx80 );
 272 int floatx80_eq_signaling( floatx80, floatx80 );
 273 int floatx80_le_quiet( floatx80, floatx80 );
 274 int floatx80_lt_quiet( floatx80, floatx80 );
 275 int floatx80_is_signaling_nan( floatx80 );
 276
 277 #endif
 278
 279 #ifdef FLOAT128
 280
 281 /*
 282 -------------------------------------------------------------------------------
 283 Software IEC/IEEE quadruple-precision conversion routines.
 284 -------------------------------------------------------------------------------
 285 */
 286 int float128_to_int32( float128 );
 287 int float128_to_int32_round_to_zero( float128 );
 288 long long float128_to_int64( float128 );
 289 long long float128_to_int64_round_to_zero( float128 );
 290 float32 float128_to_float32( float128 );
 291 float64 float128_to_float64( float128 );
 292 #ifdef FLOATX80
 293 floatx80 float128_to_floatx80( float128 );
 294 #endif
 295
 296 /*
 297 -------------------------------------------------------------------------------
 298 Software IEC/IEEE quadruple-precision operations.
 299 -------------------------------------------------------------------------------
 300 */
 301 float128 float128_round_to_int( float128 );
 302 float128 float128_add( float128, float128 );
 303 float128 float128_sub( float128, float128 );
 304 float128 float128_mul( float128, float128 );
 305 float128 float128_div( float128, float128 );
 306 float128 float128_rem( float128, float128 );
 307 float128 float128_sqrt( float128 );
 308 int float128_eq( float128, float128 );
 309 int float128_le( float128, float128 );
 310 int float128_lt( float128, float128 );
 311 int float128_eq_signaling( float128, float128 );
 312 int float128_le_quiet( float128, float128 );
 313 int float128_lt_quiet( float128, float128 );
 314 int float128_is_signaling_nan( float128 );
 315
 316 #endif
 317