lib/libc/arch/mips/softfloat/softfloat.h

   1 /*      $NetBSD: softfloat.h,v 1.3 2011/01/17 23:53:04 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 #if defined(__mips_n32) || defined(__mips_n64)
  46 #define FLOAT128
  47 #endif
  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 int 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 enum {
  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 -------------------------------------------------------------------------------
  98 Software IEC/IEEE floating-point exception flags.
  99 -------------------------------------------------------------------------------
 100 */
 101 extern fp_except float_exception_flags;
 102 extern fp_except float_exception_mask;
 103 enum {
 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 -------------------------------------------------------------------------------
 113 Routine to raise any or all of the software IEC/IEEE floating-point
 114 exception flags.
 115 -------------------------------------------------------------------------------
 116 */
 117 void float_raise( fp_except );
 118
 119 /*
 120 -------------------------------------------------------------------------------
 121 Software IEC/IEEE integer-to-floating-point conversion routines.
 122 -------------------------------------------------------------------------------
 123 */
 124 float32 int32_to_float32( int );
 125 float64 int32_to_float64( int );
 126 #ifdef FLOATX80
 127 floatx80 int32_to_floatx80( int );
 128 #endif
 129 #ifdef FLOAT128
 130 float128 int32_to_float128( int );
 131 #endif
 132 #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
 133 float32 int64_to_float32( long long );
 134 float64 int64_to_float64( long long );
 135 #ifdef FLOATX80
 136 floatx80 int64_to_floatx80( long long );
 137 #endif
 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 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
 151 unsigned int float32_to_uint32_round_to_zero( float32 );
 152 #endif
 153 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
 154 long long float32_to_int64( float32 );
 155 long long float32_to_int64_round_to_zero( float32 );
 156 #endif
 157 float64 float32_to_float64( float32 );
 158 #ifdef FLOATX80
 159 floatx80 float32_to_floatx80( float32 );
 160 #endif
 161 #ifdef FLOAT128
 162 float128 float32_to_float128( float32 );
 163 #endif
 164
 165 /*
 166 -------------------------------------------------------------------------------
 167 Software IEC/IEEE single-precision operations.
 168 -------------------------------------------------------------------------------
 169 */
 170 float32 float32_round_to_int( float32 );
 171 float32 float32_add( float32, float32 );
 172 float32 float32_sub( float32, float32 );
 173 float32 float32_mul( float32, float32 );
 174 float32 float32_div( float32, float32 );
 175 float32 float32_rem( float32, float32 );
 176 float32 float32_sqrt( float32 );
 177 int float32_eq( float32, float32 );
 178 int float32_le( float32, float32 );
 179 int float32_lt( float32, float32 );
 180 int float32_eq_signaling( float32, float32 );
 181 int float32_le_quiet( float32, float32 );
 182 int float32_lt_quiet( float32, float32 );
 183 #ifndef SOFTFLOAT_FOR_GCC
 184 int float32_is_signaling_nan( float32 );
 185 #endif
 186
 187 /*
 188 -------------------------------------------------------------------------------
 189 Software IEC/IEEE double-precision conversion routines.
 190 -------------------------------------------------------------------------------
 191 */
 192 int float64_to_int32( float64 );
 193 int float64_to_int32_round_to_zero( float64 );
 194 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
 195 unsigned int float64_to_uint32_round_to_zero( float64 );
 196 #endif
 197 #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
 198 long long float64_to_int64( float64 );
 199 long long float64_to_int64_round_to_zero( float64 );
 200 #endif
 201 float32 float64_to_float32( float64 );
 202 #ifdef FLOATX80
 203 floatx80 float64_to_floatx80( float64 );
 204 #endif
 205 #ifdef FLOAT128
 206 float128 float64_to_float128( float64 );
 207 #endif
 208
 209 /*
 210 -------------------------------------------------------------------------------
 211 Software IEC/IEEE double-precision operations.
 212 -------------------------------------------------------------------------------
 213 */
 214 float64 float64_round_to_int( float64 );
 215 float64 float64_add( float64, float64 );
 216 float64 float64_sub( float64, float64 );
 217 float64 float64_mul( float64, float64 );
 218 float64 float64_div( float64, float64 );
 219 float64 float64_rem( float64, float64 );
 220 float64 float64_sqrt( float64 );
 221 int float64_eq( float64, float64 );
 222 int float64_le( float64, float64 );
 223 int float64_lt( float64, float64 );
 224 int float64_eq_signaling( float64, float64 );
 225 int float64_le_quiet( float64, float64 );
 226 int float64_lt_quiet( float64, float64 );
 227 #ifndef SOFTFLOAT_FOR_GCC
 228 int float64_is_signaling_nan( float64 );
 229 #endif
 230
 231 #ifdef FLOATX80
 232
 233 /*
 234 -------------------------------------------------------------------------------
 235 Software IEC/IEEE extended double-precision conversion routines.
 236 -------------------------------------------------------------------------------
 237 */
 238 int floatx80_to_int32( floatx80 );
 239 int floatx80_to_int32_round_to_zero( floatx80 );
 240 long long floatx80_to_int64( floatx80 );
 241 long long floatx80_to_int64_round_to_zero( floatx80 );
 242 float32 floatx80_to_float32( floatx80 );
 243 float64 floatx80_to_float64( floatx80 );
 244 #ifdef FLOAT128
 245 float128 floatx80_to_float128( floatx80 );
 246 #endif
 247
 248 /*
 249 -------------------------------------------------------------------------------
 250 Software IEC/IEEE extended double-precision rounding precision.  Valid
 251 values are 32, 64, and 80.
 252 -------------------------------------------------------------------------------
 253 */
 254 extern int floatx80_rounding_precision;
 255
 256 /*
 257 -------------------------------------------------------------------------------
 258 Software IEC/IEEE extended double-precision operations.
 259 -------------------------------------------------------------------------------
 260 */
 261 floatx80 floatx80_round_to_int( floatx80 );
 262 floatx80 floatx80_add( floatx80, floatx80 );
 263 floatx80 floatx80_sub( floatx80, floatx80 );
 264 floatx80 floatx80_mul( floatx80, floatx80 );
 265 floatx80 floatx80_div( floatx80, floatx80 );
 266 floatx80 floatx80_rem( floatx80, floatx80 );
 267 floatx80 floatx80_sqrt( floatx80 );
 268 int floatx80_eq( floatx80, floatx80 );
 269 int floatx80_le( floatx80, floatx80 );
 270 int floatx80_lt( floatx80, floatx80 );
 271 int floatx80_eq_signaling( floatx80, floatx80 );
 272 int floatx80_le_quiet( floatx80, floatx80 );
 273 int floatx80_lt_quiet( floatx80, floatx80 );
 274 int floatx80_is_signaling_nan( floatx80 );
 275
 276 #endif
 277
 278 #ifdef FLOAT128
 279
 280 /*
 281 -------------------------------------------------------------------------------
 282 Software IEC/IEEE quadruple-precision conversion routines.
 283 -------------------------------------------------------------------------------
 284 */
 285 int float128_to_int32( float128 );
 286 int float128_to_int32_round_to_zero( float128 );
 287 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
 288 unsigned int float128_to_uint32_round_to_zero( float64 );
 289 #endif
 290 long long float128_to_int64( float128 );
 291 long long float128_to_int64_round_to_zero( float128 );
 292 #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
 293 unsigned long long float128_to_uint64_round_to_zero( float128 );
 294 #endif
 295 float32 float128_to_float32( float128 );
 296 float64 float128_to_float64( float128 );
 297 #ifdef FLOATX80
 298 floatx80 float128_to_floatx80( float128 );
 299 #endif
 300
 301 /*
 302 -------------------------------------------------------------------------------
 303 Software IEC/IEEE quadruple-precision operations.
 304 -------------------------------------------------------------------------------
 305 */
 306 float128 float128_round_to_int( float128 );
 307 float128 float128_add( float128, float128 );
 308 float128 float128_sub( float128, float128 );
 309 float128 float128_mul( float128, float128 );
 310 float128 float128_div( float128, float128 );
 311 float128 float128_rem( float128, float128 );
 312 float128 float128_sqrt( float128 );
 313 int float128_eq( float128, float128 );
 314 int float128_le( float128, float128 );
 315 int float128_lt( float128, float128 );
 316 int float128_eq_signaling( float128, float128 );
 317 int float128_le_quiet( float128, float128 );
 318 int float128_lt_quiet( float128, float128 );
 319 int float128_is_signaling_nan( float128 );
 320 flag float128_is_nan( float128 );
 321
 322 #endif
 323