projects / mirror_qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| 158142c2 FB |
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; | |
| fdbb4691 | 9 | #if defined(_BSD) && !defined(__APPLE__) || (defined(HOST_SOLARIS) && HOST_SOLARIS < 10) |
| 158142c2 FB |
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 | ||
| fdbb4691 FB |
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)) | |
| 158142c2 FB |
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 | ||
| 1b2b0af5 FB |
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 | ||
| 158142c2 FB |
103 | /*---------------------------------------------------------------------------- |
| 104 | | Software IEC/IEEE single-precision conversion routines. | |
| 105 | *----------------------------------------------------------------------------*/ | |
| 106 | int float32_to_int32( float32 a STATUS_PARAM) | |
| 107 | { | |
| 1b2b0af5 | 108 | return long_to_int32(lrintf(a)); |
| 158142c2 FB |
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 | ||
| b109f9f8 FB |
143 | float32 float32_rem( float32 a, float32 b STATUS_PARAM) |
| 144 | { | |
| 145 | return remainderf(a, b); | |
| 146 | } | |
| 147 | ||
| 158142c2 FB |
148 | float32 float32_sqrt( float32 a STATUS_PARAM) |
| 149 | { | |
| 150 | return sqrtf(a); | |
| 151 | } | |
| b109f9f8 FB |
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 | } | |
| 158142c2 FB |
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 | { | |
| 1b2b0af5 | 190 | return long_to_int32(lrint(a)); |
| 158142c2 FB |
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 | ||
| b109f9f8 FB |
247 | float64 float64_rem( float64 a, float64 b STATUS_PARAM) |
| 248 | { | |
| 249 | return remainder(a, b); | |
| 250 | } | |
| 251 | ||
| 158142c2 FB |
252 | float64 float64_sqrt( float64 a STATUS_PARAM) |
| 253 | { | |
| 254 | return sqrt(a); | |
| 255 | } | |
| b109f9f8 FB |
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 | } | |
| 158142c2 FB |
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 | { | |
| 1b2b0af5 | 299 | return long_to_int32(lrintl(a)); |
| 158142c2 FB |
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 | } | |
| b109f9f8 FB |
329 | floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM) |
| 330 | { | |
| 331 | return remainderl(a, b); | |
| 332 | } | |
| 158142c2 FB |
333 | floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM) |
| 334 | { | |
| 335 | return sqrtl(a); | |
| 336 | } | |
| b109f9f8 FB |
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 | } | |
| 158142c2 FB |
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 |