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__)
  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)
  26 #define lrint(d)                ((int32_t)rint(d))
  27 #define llrint(d)               ((int64_t)rint(d))
  28 #endif
  29
  30 #if defined(__powerpc__)
  31
  32 /* correct (but slow) PowerPC rint() (glibc version is incorrect) */
  33 double qemu_rint(double x)
  34 {
  35     double y = 4503599627370496.0;
  36     if (fabs(x) >= y)
  37         return x;
  38     if (x < 0)
  39         y = -y;
  40     y = (x + y) - y;
  41     if (y == 0.0)
  42         y = copysign(y, x);
  43     return y;
  44 }
  45
  46 #define rint qemu_rint
  47 #endif
  48
  49 /*----------------------------------------------------------------------------
  50 | Software IEC/IEEE integer-to-floating-point conversion routines.
  51 *----------------------------------------------------------------------------*/
  52 float32 int32_to_float32(int v STATUS_PARAM)
  53 {
  54     return (float32)v;
  55 }
  56
  57 float64 int32_to_float64(int v STATUS_PARAM)
  58 {
  59     return (float64)v;
  60 }
  61
  62 #ifdef FLOATX80
  63 floatx80 int32_to_floatx80(int v STATUS_PARAM)
  64 {
  65     return (floatx80)v;
  66 }
  67 #endif
  68 float32 int64_to_float32( int64_t v STATUS_PARAM)
  69 {
  70     return (float32)v;
  71 }
  72 float64 int64_to_float64( int64_t v STATUS_PARAM)
  73 {
  74     return (float64)v;
  75 }
  76 #ifdef FLOATX80
  77 floatx80 int64_to_floatx80( int64_t v STATUS_PARAM)
  78 {
  79     return (floatx80)v;
  80 }
  81 #endif
  82
  83 /*----------------------------------------------------------------------------
  84 | Software IEC/IEEE single-precision conversion routines.
  85 *----------------------------------------------------------------------------*/
  86 int float32_to_int32( float32 a STATUS_PARAM)
  87 {
  88     return lrintf(a);
  89 }
  90 int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
  91 {
  92     return (int)a;
  93 }
  94 int64_t float32_to_int64( float32 a STATUS_PARAM)
  95 {
  96     return llrintf(a);
  97 }
  98
  99 int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM)
 100 {
 101     return (int64_t)a;
 102 }
 103
 104 float64 float32_to_float64( float32 a STATUS_PARAM)
 105 {
 106     return a;
 107 }
 108 #ifdef FLOATX80
 109 floatx80 float32_to_floatx80( float32 a STATUS_PARAM)
 110 {
 111     return a;
 112 }
 113 #endif
 114
 115 /*----------------------------------------------------------------------------
 116 | Software IEC/IEEE single-precision operations.
 117 *----------------------------------------------------------------------------*/
 118 float32 float32_round_to_int( float32 a STATUS_PARAM)
 119 {
 120     return rintf(a);
 121 }
 122
 123 float32 float32_rem( float32 a, float32 b STATUS_PARAM)
 124 {
 125     return remainderf(a, b);
 126 }
 127
 128 float32 float32_sqrt( float32 a STATUS_PARAM)
 129 {
 130     return sqrtf(a);
 131 }
 132 char float32_compare( float32 a, float32 b STATUS_PARAM )
 133 {
 134     if (a < b) {
 135         return -1;
 136     } else if (a == b) {
 137         return 0;
 138     } else if (a > b) {
 139         return 1;
 140     } else {
 141         return 2;
 142     }
 143 }
 144 char float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
 145 {
 146     if (isless(a, b)) {
 147         return -1;
 148     } else if (a == b) {
 149         return 0;
 150     } else if (isgreater(a, b)) {
 151         return 1;
 152     } else {
 153         return 2;
 154     }
 155 }
 156 char float32_is_signaling_nan( float32 a1)
 157 {
 158     float32u u;
 159     uint32_t a;
 160     u.f = a1;
 161     a = u.i;
 162     return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
 163 }
 164
 165 /*----------------------------------------------------------------------------
 166 | Software IEC/IEEE double-precision conversion routines.
 167 *----------------------------------------------------------------------------*/
 168 int float64_to_int32( float64 a STATUS_PARAM)
 169 {
 170     return lrint(a);
 171 }
 172 int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
 173 {
 174     return (int)a;
 175 }
 176 int64_t float64_to_int64( float64 a STATUS_PARAM)
 177 {
 178     return llrint(a);
 179 }
 180 int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM)
 181 {
 182     return (int64_t)a;
 183 }
 184 float32 float64_to_float32( float64 a STATUS_PARAM)
 185 {
 186     return a;
 187 }
 188 #ifdef FLOATX80
 189 floatx80 float64_to_floatx80( float64 a STATUS_PARAM)
 190 {
 191     return a;
 192 }
 193 #endif
 194 #ifdef FLOAT128
 195 float128 float64_to_float128( float64 a STATUS_PARAM)
 196 {
 197     return a;
 198 }
 199 #endif
 200
 201 /*----------------------------------------------------------------------------
 202 | Software IEC/IEEE double-precision operations.
 203 *----------------------------------------------------------------------------*/
 204 float64 float64_round_to_int( float64 a STATUS_PARAM )
 205 {
 206 #if defined(__arm__)
 207     switch(STATUS(float_rounding_mode)) {
 208     default:
 209     case float_round_nearest_even:
 210         asm("rndd %0, %1" : "=f" (a) : "f"(a));
 211         break;
 212     case float_round_down:
 213         asm("rnddm %0, %1" : "=f" (a) : "f"(a));
 214         break;
 215     case float_round_up:
 216         asm("rnddp %0, %1" : "=f" (a) : "f"(a));
 217         break;
 218     case float_round_to_zero:
 219         asm("rnddz %0, %1" : "=f" (a) : "f"(a));
 220         break;
 221     }
 222 #else
 223     return rint(a);
 224 #endif
 225 }
 226
 227 float64 float64_rem( float64 a, float64 b STATUS_PARAM)
 228 {
 229     return remainder(a, b);
 230 }
 231
 232 float64 float64_sqrt( float64 a STATUS_PARAM)
 233 {
 234     return sqrt(a);
 235 }
 236 char float64_compare( float64 a, float64 b STATUS_PARAM )
 237 {
 238     if (a < b) {
 239         return -1;
 240     } else if (a == b) {
 241         return 0;
 242     } else if (a > b) {
 243         return 1;
 244     } else {
 245         return 2;
 246     }
 247 }
 248 char float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
 249 {
 250     if (isless(a, b)) {
 251         return -1;
 252     } else if (a == b) {
 253         return 0;
 254     } else if (isgreater(a, b)) {
 255         return 1;
 256     } else {
 257         return 2;
 258     }
 259 }
 260 char float64_is_signaling_nan( float64 a1)
 261 {
 262     float64u u;
 263     uint64_t a;
 264     u.f = a1;
 265     a = u.i;
 266     return
 267            ( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
 268         && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
 269
 270 }
 271
 272 #ifdef FLOATX80
 273
 274 /*----------------------------------------------------------------------------
 275 | Software IEC/IEEE extended double-precision conversion routines.
 276 *----------------------------------------------------------------------------*/
 277 int floatx80_to_int32( floatx80 a STATUS_PARAM)
 278 {
 279     return lrintl(a);
 280 }
 281 int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
 282 {
 283     return (int)a;
 284 }
 285 int64_t floatx80_to_int64( floatx80 a STATUS_PARAM)
 286 {
 287     return llrintl(a);
 288 }
 289 int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM)
 290 {
 291     return (int64_t)a;
 292 }
 293 float32 floatx80_to_float32( floatx80 a STATUS_PARAM)
 294 {
 295     return a;
 296 }
 297 float64 floatx80_to_float64( floatx80 a STATUS_PARAM)
 298 {
 299     return a;
 300 }
 301
 302 /*----------------------------------------------------------------------------
 303 | Software IEC/IEEE extended double-precision operations.
 304 *----------------------------------------------------------------------------*/
 305 floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM)
 306 {
 307     return rintl(a);
 308 }
 309 floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM)
 310 {
 311     return remainderl(a, b);
 312 }
 313 floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM)
 314 {
 315     return sqrtl(a);
 316 }
 317 char floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
 318 {
 319     if (a < b) {
 320         return -1;
 321     } else if (a == b) {
 322         return 0;
 323     } else if (a > b) {
 324         return 1;
 325     } else {
 326         return 2;
 327     }
 328 }
 329 char floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
 330 {
 331     if (isless(a, b)) {
 332         return -1;
 333     } else if (a == b) {
 334         return 0;
 335     } else if (isgreater(a, b)) {
 336         return 1;
 337     } else {
 338         return 2;
 339     }
 340 }
 341 char floatx80_is_signaling_nan( floatx80 a1)
 342 {
 343     floatx80u u;
 344     u.f = a1;
 345     return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 );
 346 }
 347
 348 #endif