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
   6 void set_float_rounding_mode(int val STATUS_PARAM)
   7 {
   8     STATUS(float_rounding_mode) = val;
   9 #if defined(_BSD) && !defined(__APPLE__) || (defined(HOST_SOLARIS) && HOST_SOLARIS < 10)
  10     fpsetround(val);
  11 #elif defined(__arm__)
  12     /* nothing to do */
  13 #else
  14     fesetround(val);
  15 #endif
  16 }
  17
  18 #ifdef FLOATX80
  19 void set_floatx80_rounding_precision(int val STATUS_PARAM)
  20 {
  21     STATUS(floatx80_rounding_precision) = val;
  22 }
  23 #endif
  24
  25 #if defined(_BSD) || (defined(HOST_SOLARIS) && HOST_SOLARIS < 10)
  26 #define lrint(d)                ((int32_t)rint(d))
  27 #define llrint(d)               ((int64_t)rint(d))
  28 #define lrintf(f)               ((int32_t)rint(f))
  29 #define llrintf(f)              ((int64_t)rint(f))
  30 #define sqrtf(f)                ((float)sqrt(f))
  31 #define remainderf(fa, fb)      ((float)remainder(fa, fb))
  32 #define rintf(f)                ((float)rint(f))
  33 #endif
  34
  35 #if defined(__powerpc__)
  36
  37 /* correct (but slow) PowerPC rint() (glibc version is incorrect) */
  38 double qemu_rint(double x)
  39 {
  40     double y = 4503599627370496.0;
  41     if (fabs(x) >= y)
  42         return x;
  43     if (x < 0)
  44         y = -y;
  45     y = (x + y) - y;
  46     if (y == 0.0)
  47         y = copysign(y, x);
  48     return y;
  49 }
  50
  51 #define rint qemu_rint
  52 #endif
  53
  54 /*----------------------------------------------------------------------------
  55 | Software IEC/IEEE integer-to-floating-point conversion routines.
  56 *----------------------------------------------------------------------------*/
  57 float32 int32_to_float32(int v STATUS_PARAM)
  58 {
  59     return (float32)v;
  60 }
  61
  62 float64 int32_to_float64(int v STATUS_PARAM)
  63 {
  64     return (float64)v;
  65 }
  66
  67 #ifdef FLOATX80
  68 floatx80 int32_to_floatx80(int v STATUS_PARAM)
  69 {
  70     return (floatx80)v;
  71 }
  72 #endif
  73 float32 int64_to_float32( int64_t v STATUS_PARAM)
  74 {
  75     return (float32)v;
  76 }
  77 float64 int64_to_float64( int64_t v STATUS_PARAM)
  78 {
  79     return (float64)v;
  80 }
  81 #ifdef FLOATX80
  82 floatx80 int64_to_floatx80( int64_t v STATUS_PARAM)
  83 {
  84     return (floatx80)v;
  85 }
  86 #endif
  87
  88 /* XXX: this code implements the x86 behaviour, not the IEEE one.  */
  89 #if HOST_LONG_BITS == 32
  90 static inline int long_to_int32(long a)
  91 {
  92     return a;
  93 }
  94 #else
  95 static inline int long_to_int32(long a)
  96 {
  97     if (a != (int32_t)a)
  98         a = 0x80000000;
  99     return a;
 100 }
 101 #endif
 102
 103 /*----------------------------------------------------------------------------
 104 | Software IEC/IEEE single-precision conversion routines.
 105 *----------------------------------------------------------------------------*/
 106 int float32_to_int32( float32 a STATUS_PARAM)
 107 {
 108     return long_to_int32(lrintf(a));
 109 }
 110 int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
 111 {
 112     return (int)a;
 113 }
 114 int64_t float32_to_int64( float32 a STATUS_PARAM)
 115 {
 116     return llrintf(a);
 117 }
 118
 119 int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM)
 120 {
 121     return (int64_t)a;
 122 }
 123
 124 float64 float32_to_float64( float32 a STATUS_PARAM)
 125 {
 126     return a;
 127 }
 128 #ifdef FLOATX80
 129 floatx80 float32_to_floatx80( float32 a STATUS_PARAM)
 130 {
 131     return a;
 132 }
 133 #endif
 134
 135 /*----------------------------------------------------------------------------
 136 | Software IEC/IEEE single-precision operations.
 137 *----------------------------------------------------------------------------*/
 138 float32 float32_round_to_int( float32 a STATUS_PARAM)
 139 {
 140     return rintf(a);
 141 }
 142
 143 float32 float32_rem( float32 a, float32 b STATUS_PARAM)
 144 {
 145     return remainderf(a, b);
 146 }
 147
 148 float32 float32_sqrt( float32 a STATUS_PARAM)
 149 {
 150     return sqrtf(a);
 151 }
 152 char float32_compare( float32 a, float32 b STATUS_PARAM )
 153 {
 154     if (a < b) {
 155         return -1;
 156     } else if (a == b) {
 157         return 0;
 158     } else if (a > b) {
 159         return 1;
 160     } else {
 161         return 2;
 162     }
 163 }
 164 char float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
 165 {
 166     if (isless(a, b)) {
 167         return -1;
 168     } else if (a == b) {
 169         return 0;
 170     } else if (isgreater(a, b)) {
 171         return 1;
 172     } else {
 173         return 2;
 174     }
 175 }
 176 char float32_is_signaling_nan( float32 a1)
 177 {
 178     float32u u;
 179     uint32_t a;
 180     u.f = a1;
 181     a = u.i;
 182     return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
 183 }
 184
 185 /*----------------------------------------------------------------------------
 186 | Software IEC/IEEE double-precision conversion routines.
 187 *----------------------------------------------------------------------------*/
 188 int float64_to_int32( float64 a STATUS_PARAM)
 189 {
 190     return long_to_int32(lrint(a));
 191 }
 192 int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
 193 {
 194     return (int)a;
 195 }
 196 int64_t float64_to_int64( float64 a STATUS_PARAM)
 197 {
 198     return llrint(a);
 199 }
 200 int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM)
 201 {
 202     return (int64_t)a;
 203 }
 204 float32 float64_to_float32( float64 a STATUS_PARAM)
 205 {
 206     return a;
 207 }
 208 #ifdef FLOATX80
 209 floatx80 float64_to_floatx80( float64 a STATUS_PARAM)
 210 {
 211     return a;
 212 }
 213 #endif
 214 #ifdef FLOAT128
 215 float128 float64_to_float128( float64 a STATUS_PARAM)
 216 {
 217     return a;
 218 }
 219 #endif
 220
 221 /*----------------------------------------------------------------------------
 222 | Software IEC/IEEE double-precision operations.
 223 *----------------------------------------------------------------------------*/
 224 float64 float64_round_to_int( float64 a STATUS_PARAM )
 225 {
 226 #if defined(__arm__)
 227     switch(STATUS(float_rounding_mode)) {
 228     default:
 229     case float_round_nearest_even:
 230         asm("rndd %0, %1" : "=f" (a) : "f"(a));
 231         break;
 232     case float_round_down:
 233         asm("rnddm %0, %1" : "=f" (a) : "f"(a));
 234         break;
 235     case float_round_up:
 236         asm("rnddp %0, %1" : "=f" (a) : "f"(a));
 237         break;
 238     case float_round_to_zero:
 239         asm("rnddz %0, %1" : "=f" (a) : "f"(a));
 240         break;
 241     }
 242 #else
 243     return rint(a);
 244 #endif
 245 }
 246
 247 float64 float64_rem( float64 a, float64 b STATUS_PARAM)
 248 {
 249     return remainder(a, b);
 250 }
 251
 252 float64 float64_sqrt( float64 a STATUS_PARAM)
 253 {
 254     return sqrt(a);
 255 }
 256 char float64_compare( float64 a, float64 b STATUS_PARAM )
 257 {
 258     if (a < b) {
 259         return -1;
 260     } else if (a == b) {
 261         return 0;
 262     } else if (a > b) {
 263         return 1;
 264     } else {
 265         return 2;
 266     }
 267 }
 268 char float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
 269 {
 270     if (isless(a, b)) {
 271         return -1;
 272     } else if (a == b) {
 273         return 0;
 274     } else if (isgreater(a, b)) {
 275         return 1;
 276     } else {
 277         return 2;
 278     }
 279 }
 280 char float64_is_signaling_nan( float64 a1)
 281 {
 282     float64u u;
 283     uint64_t a;
 284     u.f = a1;
 285     a = u.i;
 286     return
 287            ( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
 288         && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
 289
 290 }
 291
 292 #ifdef FLOATX80
 293
 294 /*----------------------------------------------------------------------------
 295 | Software IEC/IEEE extended double-precision conversion routines.
 296 *----------------------------------------------------------------------------*/
 297 int floatx80_to_int32( floatx80 a STATUS_PARAM)
 298 {
 299     return long_to_int32(lrintl(a));
 300 }
 301 int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
 302 {
 303     return (int)a;
 304 }
 305 int64_t floatx80_to_int64( floatx80 a STATUS_PARAM)
 306 {
 307     return llrintl(a);
 308 }
 309 int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM)
 310 {
 311     return (int64_t)a;
 312 }
 313 float32 floatx80_to_float32( floatx80 a STATUS_PARAM)
 314 {
 315     return a;
 316 }
 317 float64 floatx80_to_float64( floatx80 a STATUS_PARAM)
 318 {
 319     return a;
 320 }
 321
 322 /*----------------------------------------------------------------------------
 323 | Software IEC/IEEE extended double-precision operations.
 324 *----------------------------------------------------------------------------*/
 325 floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM)
 326 {
 327     return rintl(a);
 328 }
 329 floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM)
 330 {
 331     return remainderl(a, b);
 332 }
 333 floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM)
 334 {
 335     return sqrtl(a);
 336 }
 337 char floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
 338 {
 339     if (a < b) {
 340         return -1;
 341     } else if (a == b) {
 342         return 0;
 343     } else if (a > b) {
 344         return 1;
 345     } else {
 346         return 2;
 347     }
 348 }
 349 char floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
 350 {
 351     if (isless(a, b)) {
 352         return -1;
 353     } else if (a == b) {
 354         return 0;
 355     } else if (isgreater(a, b)) {
 356         return 1;
 357     } else {
 358         return 2;
 359     }
 360 }
 361 char floatx80_is_signaling_nan( floatx80 a1)
 362 {
 363     floatx80u u;
 364     u.f = a1;
 365     return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 );
 366 }
 367
 368 #endif