fpu/softfloat-native.c

   1 /* Native implementation of soft float functions. Only a single status
   2    context is supported */
   3 #include "softfloat.h"
   4 #include <math.h>
   5 #if defined(HOST_SOLARIS)
   6 #include <fenv.h>
   7 #endif
   8
   9 void set_float_rounding_mode(int val STATUS_PARAM)
  10 {
  11     STATUS(float_rounding_mode) = val;
  12 #if defined(HOST_BSD) && !defined(__APPLE__) ||         \
  13     (defined(HOST_SOLARIS) && HOST_SOLARIS < 10)
  14     fpsetround(val);
  15 #elif defined(__arm__)
  16     /* nothing to do */
  17 #else
  18     fesetround(val);
  19 #endif
  20 }
  21
  22 #ifdef FLOATX80
  23 void set_floatx80_rounding_precision(int val STATUS_PARAM)
  24 {
  25     STATUS(floatx80_rounding_precision) = val;
  26 }
  27 #endif
  28
  29 #if defined(HOST_BSD) || (defined(HOST_SOLARIS) && HOST_SOLARIS < 10)
  30 #define lrint(d)                ((int32_t)rint(d))
  31 #define llrint(d)               ((int64_t)rint(d))
  32 #define lrintf(f)               ((int32_t)rint(f))
  33 #define llrintf(f)              ((int64_t)rint(f))
  34 #define sqrtf(f)                ((float)sqrt(f))
  35 #define remainderf(fa, fb)      ((float)remainder(fa, fb))
  36 #define rintf(f)                ((float)rint(f))
  37 #if !defined(__sparc__) && defined(HOST_SOLARIS) && HOST_SOLARIS < 10
  38 extern long double rintl(long double);
  39 extern long double scalbnl(long double, int);
  40
  41 long long
  42 llrintl(long double x) {
  43         return ((long long) rintl(x));
  44 }
  45
  46 long
  47 lrintl(long double x) {
  48         return ((long) rintl(x));
  49 }
  50
  51 long double
  52 ldexpl(long double x, int n) {
  53         return (scalbnl(x, n));
  54 }
  55 #endif
  56 #endif
  57
  58 #if defined(_ARCH_PPC)
  59
  60 /* correct (but slow) PowerPC rint() (glibc version is incorrect) */
  61 static double qemu_rint(double x)
  62 {
  63     double y = 4503599627370496.0;
  64     if (fabs(x) >= y)
  65         return x;
  66     if (x < 0)
  67         y = -y;
  68     y = (x + y) - y;
  69     if (y == 0.0)
  70         y = copysign(y, x);
  71     return y;
  72 }
  73
  74 #define rint qemu_rint
  75 #endif
  76
  77 /*----------------------------------------------------------------------------
  78 | Software IEC/IEEE integer-to-floating-point conversion routines.
  79 *----------------------------------------------------------------------------*/
  80 float32 int32_to_float32(int v STATUS_PARAM)
  81 {
  82     return (float32)v;
  83 }
  84
  85 float32 uint32_to_float32(unsigned int v STATUS_PARAM)
  86 {
  87     return (float32)v;
  88 }
  89
  90 float64 int32_to_float64(int v STATUS_PARAM)
  91 {
  92     return (float64)v;
  93 }
  94
  95 float64 uint32_to_float64(unsigned int v STATUS_PARAM)
  96 {
  97     return (float64)v;
  98 }
  99
 100 #ifdef FLOATX80
 101 floatx80 int32_to_floatx80(int v STATUS_PARAM)
 102 {
 103     return (floatx80)v;
 104 }
 105 #endif
 106 float32 int64_to_float32( int64_t v STATUS_PARAM)
 107 {
 108     return (float32)v;
 109 }
 110 float32 uint64_to_float32( uint64_t v STATUS_PARAM)
 111 {
 112     return (float32)v;
 113 }
 114 float64 int64_to_float64( int64_t v STATUS_PARAM)
 115 {
 116     return (float64)v;
 117 }
 118 float64 uint64_to_float64( uint64_t v STATUS_PARAM)
 119 {
 120     return (float64)v;
 121 }
 122 #ifdef FLOATX80
 123 floatx80 int64_to_floatx80( int64_t v STATUS_PARAM)
 124 {
 125     return (floatx80)v;
 126 }
 127 #endif
 128
 129 /* XXX: this code implements the x86 behaviour, not the IEEE one.  */
 130 #if HOST_LONG_BITS == 32
 131 static inline int long_to_int32(long a)
 132 {
 133     return a;
 134 }
 135 #else
 136 static inline int long_to_int32(long a)
 137 {
 138     if (a != (int32_t)a)
 139         a = 0x80000000;
 140     return a;
 141 }
 142 #endif
 143
 144 /*----------------------------------------------------------------------------
 145 | Software IEC/IEEE single-precision conversion routines.
 146 *----------------------------------------------------------------------------*/
 147 int float32_to_int32( float32 a STATUS_PARAM)
 148 {
 149     return long_to_int32(lrintf(a));
 150 }
 151 int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
 152 {
 153     return (int)a;
 154 }
 155 int64_t float32_to_int64( float32 a STATUS_PARAM)
 156 {
 157     return llrintf(a);
 158 }
 159
 160 int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM)
 161 {
 162     return (int64_t)a;
 163 }
 164
 165 float64 float32_to_float64( float32 a STATUS_PARAM)
 166 {
 167     return a;
 168 }
 169 #ifdef FLOATX80
 170 floatx80 float32_to_floatx80( float32 a STATUS_PARAM)
 171 {
 172     return a;
 173 }
 174 #endif
 175
 176 unsigned int float32_to_uint32( float32 a STATUS_PARAM)
 177 {
 178     int64_t v;
 179     unsigned int res;
 180
 181     v = llrintf(a);
 182     if (v < 0) {
 183         res = 0;
 184     } else if (v > 0xffffffff) {
 185         res = 0xffffffff;
 186     } else {
 187         res = v;
 188     }
 189     return res;
 190 }
 191 unsigned int float32_to_uint32_round_to_zero( float32 a STATUS_PARAM)
 192 {
 193     int64_t v;
 194     unsigned int res;
 195
 196     v = (int64_t)a;
 197     if (v < 0) {
 198         res = 0;
 199     } else if (v > 0xffffffff) {
 200         res = 0xffffffff;
 201     } else {
 202         res = v;
 203     }
 204     return res;
 205 }
 206
 207 /*----------------------------------------------------------------------------
 208 | Software IEC/IEEE single-precision operations.
 209 *----------------------------------------------------------------------------*/
 210 float32 float32_round_to_int( float32 a STATUS_PARAM)
 211 {
 212     return rintf(a);
 213 }
 214
 215 float32 float32_rem( float32 a, float32 b STATUS_PARAM)
 216 {
 217     return remainderf(a, b);
 218 }
 219
 220 float32 float32_sqrt( float32 a STATUS_PARAM)
 221 {
 222     return sqrtf(a);
 223 }
 224 int float32_compare( float32 a, float32 b STATUS_PARAM )
 225 {
 226     if (a < b) {
 227         return float_relation_less;
 228     } else if (a == b) {
 229         return float_relation_equal;
 230     } else if (a > b) {
 231         return float_relation_greater;
 232     } else {
 233         return float_relation_unordered;
 234     }
 235 }
 236 int float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
 237 {
 238     if (isless(a, b)) {
 239         return float_relation_less;
 240     } else if (a == b) {
 241         return float_relation_equal;
 242     } else if (isgreater(a, b)) {
 243         return float_relation_greater;
 244     } else {
 245         return float_relation_unordered;
 246     }
 247 }
 248 int float32_is_signaling_nan( float32 a1)
 249 {
 250     float32u u;
 251     uint32_t a;
 252     u.f = a1;
 253     a = u.i;
 254     return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
 255 }
 256
 257 int float32_is_nan( float32 a1 )
 258 {
 259     float32u u;
 260     uint64_t a;
 261     u.f = a1;
 262     a = u.i;
 263     return ( 0xFF800000 < ( a<<1 ) );
 264 }
 265
 266 /*----------------------------------------------------------------------------
 267 | Software IEC/IEEE double-precision conversion routines.
 268 *----------------------------------------------------------------------------*/
 269 int float64_to_int32( float64 a STATUS_PARAM)
 270 {
 271     return long_to_int32(lrint(a));
 272 }
 273 int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
 274 {
 275     return (int)a;
 276 }
 277 int64_t float64_to_int64( float64 a STATUS_PARAM)
 278 {
 279     return llrint(a);
 280 }
 281 int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM)
 282 {
 283     return (int64_t)a;
 284 }
 285 float32 float64_to_float32( float64 a STATUS_PARAM)
 286 {
 287     return a;
 288 }
 289 #ifdef FLOATX80
 290 floatx80 float64_to_floatx80( float64 a STATUS_PARAM)
 291 {
 292     return a;
 293 }
 294 #endif
 295 #ifdef FLOAT128
 296 float128 float64_to_float128( float64 a STATUS_PARAM)
 297 {
 298     return a;
 299 }
 300 #endif
 301
 302 unsigned int float64_to_uint32( float64 a STATUS_PARAM)
 303 {
 304     int64_t v;
 305     unsigned int res;
 306
 307     v = llrint(a);
 308     if (v < 0) {
 309         res = 0;
 310     } else if (v > 0xffffffff) {
 311         res = 0xffffffff;
 312     } else {
 313         res = v;
 314     }
 315     return res;
 316 }
 317 unsigned int float64_to_uint32_round_to_zero( float64 a STATUS_PARAM)
 318 {
 319     int64_t v;
 320     unsigned int res;
 321
 322     v = (int64_t)a;
 323     if (v < 0) {
 324         res = 0;
 325     } else if (v > 0xffffffff) {
 326         res = 0xffffffff;
 327     } else {
 328         res = v;
 329     }
 330     return res;
 331 }
 332 uint64_t float64_to_uint64 (float64 a STATUS_PARAM)
 333 {
 334     int64_t v;
 335
 336     v = llrint(a + (float64)INT64_MIN);
 337
 338     return v - INT64_MIN;
 339 }
 340 uint64_t float64_to_uint64_round_to_zero (float64 a STATUS_PARAM)
 341 {
 342     int64_t v;
 343
 344     v = (int64_t)(a + (float64)INT64_MIN);
 345
 346     return v - INT64_MIN;
 347 }
 348
 349 /*----------------------------------------------------------------------------
 350 | Software IEC/IEEE double-precision operations.
 351 *----------------------------------------------------------------------------*/
 352 #if defined(__sun__) && defined(HOST_SOLARIS) && HOST_SOLARIS < 10
 353 static inline float64 trunc(float64 x)
 354 {
 355     return x < 0 ? -floor(-x) : floor(x);
 356 }
 357 #endif
 358 float64 float64_trunc_to_int( float64 a STATUS_PARAM )
 359 {
 360     return trunc(a);
 361 }
 362
 363 float64 float64_round_to_int( float64 a STATUS_PARAM )
 364 {
 365 #if defined(__arm__)
 366     switch(STATUS(float_rounding_mode)) {
 367     default:
 368     case float_round_nearest_even:
 369         asm("rndd %0, %1" : "=f" (a) : "f"(a));
 370         break;
 371     case float_round_down:
 372         asm("rnddm %0, %1" : "=f" (a) : "f"(a));
 373         break;
 374     case float_round_up:
 375         asm("rnddp %0, %1" : "=f" (a) : "f"(a));
 376         break;
 377     case float_round_to_zero:
 378         asm("rnddz %0, %1" : "=f" (a) : "f"(a));
 379         break;
 380     }
 381 #else
 382     return rint(a);
 383 #endif
 384 }
 385
 386 float64 float64_rem( float64 a, float64 b STATUS_PARAM)
 387 {
 388     return remainder(a, b);
 389 }
 390
 391 float64 float64_sqrt( float64 a STATUS_PARAM)
 392 {
 393     return sqrt(a);
 394 }
 395 int float64_compare( float64 a, float64 b STATUS_PARAM )
 396 {
 397     if (a < b) {
 398         return float_relation_less;
 399     } else if (a == b) {
 400         return float_relation_equal;
 401     } else if (a > b) {
 402         return float_relation_greater;
 403     } else {
 404         return float_relation_unordered;
 405     }
 406 }
 407 int float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
 408 {
 409     if (isless(a, b)) {
 410         return float_relation_less;
 411     } else if (a == b) {
 412         return float_relation_equal;
 413     } else if (isgreater(a, b)) {
 414         return float_relation_greater;
 415     } else {
 416         return float_relation_unordered;
 417     }
 418 }
 419 int float64_is_signaling_nan( float64 a1)
 420 {
 421     float64u u;
 422     uint64_t a;
 423     u.f = a1;
 424     a = u.i;
 425     return
 426            ( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
 427         && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
 428
 429 }
 430
 431 int float64_is_nan( float64 a1 )
 432 {
 433     float64u u;
 434     uint64_t a;
 435     u.f = a1;
 436     a = u.i;
 437
 438     return ( LIT64( 0xFFF0000000000000 ) < (bits64) ( a<<1 ) );
 439
 440 }
 441
 442 #ifdef FLOATX80
 443
 444 /*----------------------------------------------------------------------------
 445 | Software IEC/IEEE extended double-precision conversion routines.
 446 *----------------------------------------------------------------------------*/
 447 int floatx80_to_int32( floatx80 a STATUS_PARAM)
 448 {
 449     return long_to_int32(lrintl(a));
 450 }
 451 int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
 452 {
 453     return (int)a;
 454 }
 455 int64_t floatx80_to_int64( floatx80 a STATUS_PARAM)
 456 {
 457     return llrintl(a);
 458 }
 459 int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM)
 460 {
 461     return (int64_t)a;
 462 }
 463 float32 floatx80_to_float32( floatx80 a STATUS_PARAM)
 464 {
 465     return a;
 466 }
 467 float64 floatx80_to_float64( floatx80 a STATUS_PARAM)
 468 {
 469     return a;
 470 }
 471
 472 /*----------------------------------------------------------------------------
 473 | Software IEC/IEEE extended double-precision operations.
 474 *----------------------------------------------------------------------------*/
 475 floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM)
 476 {
 477     return rintl(a);
 478 }
 479 floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM)
 480 {
 481     return remainderl(a, b);
 482 }
 483 floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM)
 484 {
 485     return sqrtl(a);
 486 }
 487 int floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
 488 {
 489     if (a < b) {
 490         return float_relation_less;
 491     } else if (a == b) {
 492         return float_relation_equal;
 493     } else if (a > b) {
 494         return float_relation_greater;
 495     } else {
 496         return float_relation_unordered;
 497     }
 498 }
 499 int floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
 500 {
 501     if (isless(a, b)) {
 502         return float_relation_less;
 503     } else if (a == b) {
 504         return float_relation_equal;
 505     } else if (isgreater(a, b)) {
 506         return float_relation_greater;
 507     } else {
 508         return float_relation_unordered;
 509     }
 510 }
 511 int floatx80_is_signaling_nan( floatx80 a1)
 512 {
 513     floatx80u u;
 514     uint64_t aLow;
 515     u.f = a1;
 516
 517     aLow = u.i.low & ~ LIT64( 0x4000000000000000 );
 518     return
 519            ( ( u.i.high & 0x7FFF ) == 0x7FFF )
 520         && (bits64) ( aLow<<1 )
 521         && ( u.i.low == aLow );
 522 }
 523
 524 int floatx80_is_nan( floatx80 a1 )
 525 {
 526     floatx80u u;
 527     u.f = a1;
 528     return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 );
 529 }
 530
 531 #endif