root / fpu / softfloat-native.c @ 14d483ec
History | View | Annotate | Download (11.4 kB)
| 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
|