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Rev 661 | Rev 688 | ||
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Line 41... | Line 41... | ||
41 | if (expdiff<0) { |
41 | if (expdiff<0) { |
42 | if (isFloat32NaN(b)) { |
42 | if (isFloat32NaN(b)) { |
43 | //TODO: fix SigNaN |
43 | //TODO: fix SigNaN |
44 | if (isFloat32SigNaN(b)) { |
44 | if (isFloat32SigNaN(b)) { |
45 | }; |
45 | }; |
- | 46 | ||
46 | return b; |
47 | return b; |
47 | }; |
48 | }; |
48 | 49 | ||
49 | if (b.parts.exp==0xFF) { |
50 | if (b.parts.exp==0xFF) { |
50 | return b; |
51 | return b; |
Line 216... | Line 217... | ||
216 | while ((exp1>0)&&(!(mant1&0x20000000))) { |
217 | while ((exp1>0)&&(!(mant1&0x20000000))) { |
217 | exp1--; |
218 | exp1--; |
218 | mant1 <<= 1; |
219 | mant1 <<= 1; |
219 | if(mant1 == 0) { |
220 | if(mant1 == 0) { |
220 | /* Realy is it an underflow? ... */ |
221 | /* Realy is it an underflow? ... */ |
221 | //TODO: fix underflow |
222 | /* TODO: fix underflow */ |
222 | }; |
223 | }; |
223 | }; |
224 | }; |
224 | 225 | ||
225 | //rounding - if first bit after mantisa is set then round up |
226 | //rounding - if first bit after mantisa is set then round up |
226 | mant1 += 0x20; |
227 | mant1 += 0x20; |
Line 234... | Line 235... | ||
234 | result.parts.exp = exp1; |
235 | result.parts.exp = exp1; |
235 | 236 | ||
236 | return result; |
237 | return result; |
237 | }; |
238 | }; |
238 | 239 | ||
- | 240 | /** Multiply two 32 bit float numbers |
|
- | 241 | * |
|
- | 242 | */ |
|
- | 243 | float32 mulFloat32(float32 a, float32 b) |
|
- | 244 | { |
|
- | 245 | float32 result; |
|
- | 246 | __u64 mant1, mant2; |
|
- | 247 | __s32 exp; |
|
- | 248 | ||
- | 249 | result.parts.sign = a.parts.sign ^ b.parts.sign; |
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- | 250 | ||
- | 251 | if ((isFloat32NaN(a))||(isFloat32NaN(b))) { |
|
- | 252 | /* TODO: fix SigNaNs */ |
|
- | 253 | if (isFloat32SigNaN(a)) { |
|
- | 254 | result.parts.mantisa = a.parts.mantisa; |
|
- | 255 | result.parts.exp = a.parts.exp; |
|
- | 256 | return result; |
|
- | 257 | }; |
|
- | 258 | if (isFloat32SigNaN(b)) { /* TODO: fix SigNaN */ |
|
- | 259 | result.parts.mantisa = b.parts.mantisa; |
|
- | 260 | result.parts.exp = b.parts.exp; |
|
- | 261 | return result; |
|
- | 262 | }; |
|
- | 263 | /* set NaN as result */ |
|
- | 264 | result.parts.mantisa = 0x1; |
|
- | 265 | result.parts.exp = 0xFF; |
|
- | 266 | return result; |
|
- | 267 | }; |
|
- | 268 | ||
- | 269 | if (isFloat32Infinity(a)) { |
|
- | 270 | if (isFloat32Zero(b)) { |
|
- | 271 | /* FIXME: zero * infinity */ |
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- | 272 | result.parts.mantisa = 0x1; |
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- | 273 | result.parts.exp = 0xFF; |
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- | 274 | return result; |
|
- | 275 | } |
|
- | 276 | result.parts.mantisa = a.parts.mantisa; |
|
- | 277 | result.parts.exp = a.parts.exp; |
|
- | 278 | return result; |
|
- | 279 | } |
|
- | 280 | ||
- | 281 | if (isFloat32Infinity(b)) { |
|
- | 282 | if (isFloat32Zero(a)) { |
|
- | 283 | /* FIXME: zero * infinity */ |
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- | 284 | result.parts.mantisa = 0x1; |
|
- | 285 | result.parts.exp = 0xFF; |
|
- | 286 | return result; |
|
- | 287 | } |
|
- | 288 | result.parts.mantisa = b.parts.mantisa; |
|
- | 289 | result.parts.exp = b.parts.exp; |
|
- | 290 | return result; |
|
- | 291 | } |
|
- | 292 | ||
- | 293 | /* exp is signed so we can easy detect underflow */ |
|
- | 294 | exp = a.parts.exp + b.parts.exp; |
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- | 295 | exp -= FLOAT32_BIAS; |
|
- | 296 | ||
- | 297 | if (exp >= 0xFF ) { |
|
- | 298 | /* FIXME: overflow */ |
|
- | 299 | /* set infinity as result */ |
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- | 300 | result.parts.mantisa = 0x0; |
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- | 301 | result.parts.exp = 0xFF; |
|
- | 302 | return result; |
|
- | 303 | }; |
|
- | 304 | ||
- | 305 | if (exp < 0) { |
|
- | 306 | /* FIXME: underflow */ |
|
- | 307 | /* return signed zero */ |
|
- | 308 | result.parts.mantisa = 0x0; |
|
- | 309 | result.parts.exp = 0x0; |
|
- | 310 | return result; |
|
- | 311 | }; |
|
- | 312 | ||
- | 313 | mant1 = a.parts.mantisa; |
|
- | 314 | if (a.parts.exp>0) { |
|
- | 315 | mant1 |= 0x800000; |
|
- | 316 | } else { |
|
- | 317 | ++exp; |
|
- | 318 | }; |
|
- | 319 | ||
- | 320 | mant2 = b.parts.mantisa; |
|
- | 321 | if (b.parts.exp>0) { |
|
- | 322 | mant2 |= 0x800000; |
|
- | 323 | } else { |
|
- | 324 | ++exp; |
|
- | 325 | }; |
|
- | 326 | ||
- | 327 | mant1 <<= 1; /* one bit space for rounding */ |
|
- | 328 | ||
- | 329 | mant1 = mant1 * mant2; |
|
- | 330 | /* round and return */ |
|
- | 331 | ||
- | 332 | while ((exp < 0xFF )&&(mant1 > 0x1FFFFFF )) { /* 0xFFFFFF is 23 bits of mantisa + one more for hidden bit (all shifted 1 bit left)*/ |
|
- | 333 | ++exp; |
|
- | 334 | mant1 >>= 1; |
|
- | 335 | }; |
|
- | 336 | ||
- | 337 | /* rounding */ |
|
- | 338 | //++mant1; /* FIXME: not works - without it is ok */ |
|
- | 339 | mant1 >>= 1; /* shift off rounding space */ |
|
- | 340 | ||
- | 341 | if ((exp < 0xFF )&&(mant1 > 0xFFFFFF )) { |
|
- | 342 | ++exp; |
|
- | 343 | mant1 >>= 1; |
|
- | 344 | }; |
|
- | 345 | ||
- | 346 | if (exp >= 0xFF ) { |
|
- | 347 | /* TODO: fix overflow */ |
|
- | 348 | /* return infinity*/ |
|
- | 349 | result.parts.exp = 0xFF; |
|
- | 350 | result.parts.mantisa = 0x0; |
|
- | 351 | return result; |
|
- | 352 | } |
|
- | 353 | ||
- | 354 | exp -= FLOAT32_MANTISA_SIZE; |
|
- | 355 | ||
- | 356 | if (exp <= FLOAT32_MANTISA_SIZE) { |
|
- | 357 | /* denormalized number */ |
|
- | 358 | mant1 >>= 1; /* denormalize */ |
|
- | 359 | while ((mant1 > 0) && (exp < 0)) { |
|
- | 360 | mant1 >>= 1; |
|
- | 361 | ++exp; |
|
- | 362 | }; |
|
- | 363 | if (mant1 == 0) { |
|
- | 364 | /* FIXME : underflow */ |
|
- | 365 | result.parts.exp = 0; |
|
- | 366 | result.parts.mantisa = 0; |
|
- | 367 | return result; |
|
- | 368 | }; |
|
- | 369 | }; |
|
- | 370 | result.parts.exp = exp; |
|
- | 371 | result.parts.mantisa = mant1 & 0x7FFFFF; |
|
- | 372 | ||
- | 373 | return result; |
|
- | 374 | ||
- | 375 | }; |
|
- | 376 | ||
- | 377 |