Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /*___________________________________________________________________________ |
| 2 | | | |
| 3 | | Function Name : extract_h | |
| 4 | | | |
| 5 | | Purpose : | |
| 6 | | | |
| 7 | | Return the 16 MSB of L_var1. | |
| 8 | | | |
| 9 | | Complexity weight : 1 | |
| 10 | | | |
| 11 | | Inputs : | |
| 12 | | | |
| 13 | | L_var1 | |
| 14 | | 32 bit long signed integer (Word32 ) whose value falls in the | |
| 15 | | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| 16 | | | |
| 17 | | Outputs : | |
| 18 | | | |
| 19 | | none | |
| 20 | | | |
| 21 | | Return Value : | |
| 22 | | | |
| 23 | | var_out | |
| 24 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 25 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 26 | |___________________________________________________________________________| |
| 27 | */ |
| 28 | PJ_INLINE(Word16) extract_h (Word32 L_var1) |
| 29 | { |
| 30 | return (Word16) (L_var1 >> 16); |
| 31 | } |
| 32 | /* ------------------------- End of extract_h() ------------------------- */ |
| 33 | |
| 34 | |
| 35 | /*___________________________________________________________________________ |
| 36 | | | |
| 37 | | Function Name : extract_l | |
| 38 | | | |
| 39 | | Purpose : | |
| 40 | | | |
| 41 | | Return the 16 LSB of L_var1. | |
| 42 | | | |
| 43 | | Complexity weight : 1 | |
| 44 | | | |
| 45 | | Inputs : | |
| 46 | | | |
| 47 | | L_var1 | |
| 48 | | 32 bit long signed integer (Word32 ) whose value falls in the | |
| 49 | | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| 50 | | | |
| 51 | | Outputs : | |
| 52 | | | |
| 53 | | none | |
| 54 | | | |
| 55 | | Return Value : | |
| 56 | | | |
| 57 | | var_out | |
| 58 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 59 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 60 | |___________________________________________________________________________| |
| 61 | */ |
| 62 | PJ_INLINE(Word16) extract_l (Word32 L_var1) |
| 63 | { |
| 64 | return (Word16) L_var1; |
| 65 | } |
| 66 | |
| 67 | /* ------------------------- End of extract_l() ------------------------- */ |
| 68 | |
| 69 | |
| 70 | /*___________________________________________________________________________ |
| 71 | | | |
| 72 | | Function Name : saturate | |
| 73 | | | |
| 74 | | Purpose : | |
| 75 | | | |
| 76 | | Limit the 32 bit input to the range of a 16 bit word. | |
| 77 | | | |
| 78 | | Inputs : | |
| 79 | | | |
| 80 | | L_var1 | |
| 81 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 82 | | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| 83 | | | |
| 84 | | Outputs : | |
| 85 | | | |
| 86 | | none | |
| 87 | | | |
| 88 | | Return Value : | |
| 89 | | | |
| 90 | | var_out | |
| 91 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 92 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 93 | |___________________________________________________________________________| |
| 94 | */ |
| 95 | PJ_INLINE(Word16) saturate (Word32 L_var1) |
| 96 | { |
| 97 | Word16 val16 = (Word16) L_var1; |
| 98 | |
| 99 | if (val16 == L_var1) |
| 100 | return val16; |
| 101 | |
| 102 | if (L_var1 > MAX_16) |
| 103 | return MAX_16; |
| 104 | return MIN_16; |
| 105 | } |
| 106 | /* ------------------------- End of saturate() ------------------------- */ |
| 107 | |
| 108 | |
| 109 | #if PJ_HAS_INT64 |
| 110 | PJ_INLINE(Word32) L_saturate (pj_int64_t LL_var1) |
| 111 | { |
| 112 | pj_int32_t L_var1 = (pj_int32_t)LL_var1; |
| 113 | if (LL_var1 == L_var1) |
| 114 | return L_var1; |
| 115 | else if (LL_var1 > MAX_32) |
| 116 | return MAX_32; |
| 117 | else |
| 118 | return MIN_32; |
| 119 | } |
| 120 | #endif |
| 121 | |
| 122 | |
| 123 | /*___________________________________________________________________________ |
| 124 | | | |
| 125 | | Function Name : add | |
| 126 | | | |
| 127 | | Purpose : | |
| 128 | | | |
| 129 | | Performs the addition (var1+var2) with overflow control and saturation;| |
| 130 | | the 16 bit result is set at +32767 when overflow occurs or at -32768 | |
| 131 | | when underflow occurs. | |
| 132 | | | |
| 133 | | Complexity weight : 1 | |
| 134 | | | |
| 135 | | Inputs : | |
| 136 | | | |
| 137 | | var1 | |
| 138 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 139 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 140 | | | |
| 141 | | var2 | |
| 142 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 143 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 144 | | | |
| 145 | | Outputs : | |
| 146 | | | |
| 147 | | none | |
| 148 | | | |
| 149 | | Return Value : | |
| 150 | | | |
| 151 | | var_out | |
| 152 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 153 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 154 | |___________________________________________________________________________| |
| 155 | */ |
| 156 | PJ_INLINE(Word16) add (Word16 var1, Word16 var2) |
| 157 | { |
| 158 | return saturate (var1 + var2); |
| 159 | } |
| 160 | /* ------------------------- End of add() ------------------------- */ |
| 161 | |
| 162 | |
| 163 | /*___________________________________________________________________________ |
| 164 | | | |
| 165 | | Function Name : sub | |
| 166 | | | |
| 167 | | Purpose : | |
| 168 | | | |
| 169 | | Performs the subtraction (var1+var2) with overflow control and satu- | |
| 170 | | ration; the 16 bit result is set at +32767 when overflow occurs or at | |
| 171 | | -32768 when underflow occurs. | |
| 172 | | | |
| 173 | | Complexity weight : 1 | |
| 174 | | | |
| 175 | | Inputs : | |
| 176 | | | |
| 177 | | var1 | |
| 178 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 179 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 180 | | | |
| 181 | | var2 | |
| 182 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 183 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 184 | | | |
| 185 | | Outputs : | |
| 186 | | | |
| 187 | | none | |
| 188 | | | |
| 189 | | Return Value : | |
| 190 | | | |
| 191 | | var_out | |
| 192 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 193 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 194 | |___________________________________________________________________________| |
| 195 | */ |
| 196 | PJ_INLINE(Word16) sub (Word16 var1, Word16 var2) |
| 197 | { |
| 198 | return saturate ((Word32) var1 - var2); |
| 199 | } |
| 200 | /* ------------------------- End of sub() ------------------------- */ |
| 201 | |
| 202 | |
| 203 | /*___________________________________________________________________________ |
| 204 | | | |
| 205 | | Function Name : negate | |
| 206 | | | |
| 207 | | Purpose : | |
| 208 | | | |
| 209 | | Negate var1 with saturation, saturate in the case where input is -32768:| |
| 210 | | negate(var1) = sub(0,var1). | |
| 211 | | | |
| 212 | | Complexity weight : 1 | |
| 213 | | | |
| 214 | | Inputs : | |
| 215 | | | |
| 216 | | var1 | |
| 217 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 218 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 219 | | | |
| 220 | | Outputs : | |
| 221 | | | |
| 222 | | none | |
| 223 | | | |
| 224 | | Return Value : | |
| 225 | | | |
| 226 | | var_out | |
| 227 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 228 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 229 | |___________________________________________________________________________| |
| 230 | */ |
| 231 | PJ_INLINE(Word16) negate (Word16 var1) |
| 232 | { |
| 233 | return (Word16)((var1 == MIN_16) ? MAX_16 : -var1); |
| 234 | } |
| 235 | /* ------------------------- End of negate() ------------------------- */ |
| 236 | |
| 237 | |
| 238 | |
| 239 | |
| 240 | /*___________________________________________________________________________ |
| 241 | | | |
| 242 | | Function Name : L_add | |
| 243 | | | |
| 244 | | Purpose : | |
| 245 | | | |
| 246 | | 32 bits addition of the two 32 bits variables (L_var1+L_var2) with | |
| 247 | | overflow control and saturation; the result is set at +2147483647 when | |
| 248 | | overflow occurs or at -2147483648 when underflow occurs. | |
| 249 | | | |
| 250 | | Complexity weight : 2 | |
| 251 | | | |
| 252 | | Inputs : | |
| 253 | | | |
| 254 | | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| 255 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 256 | | | |
| 257 | | L_var2 32 bit long signed integer (Word32) whose value falls in the | |
| 258 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 259 | | | |
| 260 | | Outputs : | |
| 261 | | | |
| 262 | | none | |
| 263 | | | |
| 264 | | Return Value : | |
| 265 | | | |
| 266 | | L_var_out | |
| 267 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 268 | | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| 269 | |___________________________________________________________________________| |
| 270 | */ |
| 271 | PJ_INLINE(Word32) L_add (Word32 L_var1, Word32 L_var2) |
| 272 | { |
| 273 | #if PJ_HAS_INT64 |
| 274 | return L_saturate(((pj_int64_t)L_var1) + L_var2); |
| 275 | #else |
| 276 | Word32 L_var_out; |
| 277 | |
| 278 | L_var_out = L_var1 + L_var2; |
| 279 | |
| 280 | if (((L_var1 ^ L_var2) & MIN_32) == 0) |
| 281 | { |
| 282 | if ((L_var_out ^ L_var1) & MIN_32) |
| 283 | { |
| 284 | SET_OVERFLOW(1); |
| 285 | L_var_out = (L_var1 < 0) ? MIN_32 : MAX_32; |
| 286 | } |
| 287 | } |
| 288 | return (L_var_out); |
| 289 | #endif |
| 290 | } |
| 291 | |
| 292 | /* ------------------------- End of L_add() ------------------------- */ |
| 293 | |
| 294 | |
| 295 | |
| 296 | |
| 297 | /*___________________________________________________________________________ |
| 298 | | | |
| 299 | | Function Name : L_sub | |
| 300 | | | |
| 301 | | Purpose : | |
| 302 | | | |
| 303 | | 32 bits subtraction of the two 32 bits variables (L_var1-L_var2) with | |
| 304 | | overflow control and saturation; the result is set at +2147483647 when | |
| 305 | | overflow occurs or at -2147483648 when underflow occurs. | |
| 306 | | | |
| 307 | | Complexity weight : 2 | |
| 308 | | | |
| 309 | | Inputs : | |
| 310 | | | |
| 311 | | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| 312 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 313 | | | |
| 314 | | L_var2 32 bit long signed integer (Word32) whose value falls in the | |
| 315 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 316 | | | |
| 317 | | Outputs : | |
| 318 | | | |
| 319 | | none | |
| 320 | | | |
| 321 | | Return Value : | |
| 322 | | | |
| 323 | | L_var_out | |
| 324 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 325 | | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| 326 | |___________________________________________________________________________| |
| 327 | */ |
| 328 | PJ_INLINE(Word32) L_sub (Word32 L_var1, Word32 L_var2) |
| 329 | { |
| 330 | #if PJ_HAS_INT64 |
| 331 | return L_saturate((pj_int64_t)L_var1 - L_var2); |
| 332 | #else |
| 333 | Word32 L_var_out; |
| 334 | |
| 335 | L_var_out = L_var1 - L_var2; |
| 336 | |
| 337 | if (((L_var1 ^ L_var2) & MIN_32) != 0) |
| 338 | { |
| 339 | if ((L_var_out ^ L_var1) & MIN_32) |
| 340 | { |
| 341 | L_var_out = (L_var1 < 0L) ? MIN_32 : MAX_32; |
| 342 | SET_OVERFLOW(1); |
| 343 | } |
| 344 | } |
| 345 | return (L_var_out); |
| 346 | #endif |
| 347 | } |
| 348 | /* ------------------------- End of L_sub() ------------------------- */ |
| 349 | |
| 350 | /*___________________________________________________________________________ |
| 351 | | | |
| 352 | | Function Name : L_mult | |
| 353 | | | |
| 354 | | Purpose : | |
| 355 | | | |
| 356 | | L_mult is the 32 bit result of the multiplication of var1 times var2 | |
| 357 | | with one shift left i.e.: | |
| 358 | | L_mult(var1,var2) = L_shl((var1 times var2),1) and | |
| 359 | | L_mult(-32768,-32768) = 2147483647. | |
| 360 | | | |
| 361 | | Complexity weight : 1 | |
| 362 | | | |
| 363 | | Inputs : | |
| 364 | | | |
| 365 | | var1 | |
| 366 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 367 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 368 | | | |
| 369 | | var2 | |
| 370 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 371 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 372 | | | |
| 373 | | Outputs : | |
| 374 | | | |
| 375 | | none | |
| 376 | | | |
| 377 | | Return Value : | |
| 378 | | | |
| 379 | | L_var_out | |
| 380 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 381 | | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| 382 | |___________________________________________________________________________| |
| 383 | */ |
| 384 | PJ_INLINE(Word32) L_mult (Word16 var1, Word16 var2) |
| 385 | { |
| 386 | Word32 L_var_out; |
| 387 | |
| 388 | L_var_out = (Word32) var1 *(Word32) var2; |
| 389 | |
| 390 | if (L_var_out != (Word32) 0x40000000L) |
| 391 | { |
| 392 | return L_var_out << 1; |
| 393 | } |
| 394 | else |
| 395 | { |
| 396 | SET_OVERFLOW(1); |
| 397 | return MAX_32; |
| 398 | } |
| 399 | } |
| 400 | /* ------------------------- End of L_mult() ------------------------- */ |
| 401 | |
| 402 | |
| 403 | /*___________________________________________________________________________ |
| 404 | | | |
| 405 | | Function Name : L_mac | |
| 406 | | | |
| 407 | | Purpose : | |
| 408 | | | |
| 409 | | Multiply var1 by var2 and shift the result left by 1. Add the 32 bit | |
| 410 | | result to L_var3 with saturation, return a 32 bit result: | |
| 411 | | L_mac(L_var3,var1,var2) = L_add(L_var3,L_mult(var1,var2)). | |
| 412 | | | |
| 413 | | Complexity weight : 1 | |
| 414 | | | |
| 415 | | Inputs : | |
| 416 | | | |
| 417 | | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
| 418 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 419 | | | |
| 420 | | var1 | |
| 421 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 422 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 423 | | | |
| 424 | | var2 | |
| 425 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 426 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 427 | | | |
| 428 | | Outputs : | |
| 429 | | | |
| 430 | | none | |
| 431 | | | |
| 432 | | Return Value : | |
| 433 | | | |
| 434 | | L_var_out | |
| 435 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 436 | | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| 437 | |___________________________________________________________________________| |
| 438 | */ |
| 439 | PJ_INLINE(Word32) L_mac (Word32 L_var3, Word16 var1, Word16 var2) |
| 440 | { |
| 441 | return L_add (L_var3, L_mult (var1, var2)); |
| 442 | } |
| 443 | /* ------------------------- End of L_mac() ------------------------- */ |
| 444 | |
| 445 | |
| 446 | /*___________________________________________________________________________ |
| 447 | | | |
| 448 | | Function Name : round | |
| 449 | | | |
| 450 | | Purpose : | |
| 451 | | | |
| 452 | | Round the lower 16 bits of the 32 bit input number into the MS 16 bits | |
| 453 | | with saturation. Shift the resulting bits right by 16 and return the 16 | |
| 454 | | bit number: | |
| 455 | | round(L_var1) = extract_h(L_add(L_var1,32768)) | |
| 456 | | | |
| 457 | | Complexity weight : 1 | |
| 458 | | | |
| 459 | | Inputs : | |
| 460 | | | |
| 461 | | L_var1 | |
| 462 | | 32 bit long signed integer (Word32 ) whose value falls in the | |
| 463 | | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| 464 | | | |
| 465 | | Outputs : | |
| 466 | | | |
| 467 | | none | |
| 468 | | | |
| 469 | | Return Value : | |
| 470 | | | |
| 471 | | var_out | |
| 472 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 473 | | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| 474 | |___________________________________________________________________________| |
| 475 | */ |
| 476 | PJ_INLINE(Word16) itu_round (Word32 L_var1) |
| 477 | { |
| 478 | return extract_h (L_add (L_var1, (Word32) 0x00008000L)); |
| 479 | } |
| 480 | /* ------------------------- End of round() ------------------------- */ |
| 481 | |
| 482 | |
| 483 | /*___________________________________________________________________________ |
| 484 | | | |
| 485 | | Function Name : L_shr | |
| 486 | | | |
| 487 | | Purpose : | |
| 488 | | | |
| 489 | | Arithmetically shift the 32 bit input L_var1 right var2 positions with | |
| 490 | | sign extension. If var2 is negative, arithmetically shift L_var1 left | |
| 491 | | by -var2 and zero fill the -var2 LSB of the result. Saturate the result | |
| 492 | | in case of underflows or overflows. | |
| 493 | | | |
| 494 | | Complexity weight : 2 | |
| 495 | | | |
| 496 | | Inputs : | |
| 497 | | | |
| 498 | | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| 499 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 500 | | | |
| 501 | | var2 | |
| 502 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 503 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 504 | | | |
| 505 | | Outputs : | |
| 506 | | | |
| 507 | | none | |
| 508 | | | |
| 509 | | Return Value : | |
| 510 | | | |
| 511 | | L_var_out | |
| 512 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 513 | | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| 514 | |___________________________________________________________________________| |
| 515 | */ |
| 516 | PJ_INLINE(Word32) L_shr_nocheck(Word32 L_var1, Word16 var2) |
| 517 | { |
| 518 | #if 1 |
| 519 | return L_var1 >> var2; |
| 520 | #else |
| 521 | if (var2 >= 31) |
| 522 | { |
| 523 | return (L_var1 < 0L) ? -1 : 0; |
| 524 | } |
| 525 | else |
| 526 | { |
| 527 | if (L_var1 < 0) |
| 528 | { |
| 529 | return ~((~L_var1) >> var2); |
| 530 | } |
| 531 | else |
| 532 | { |
| 533 | return L_var1 >> var2; |
| 534 | } |
| 535 | } |
| 536 | #endif |
| 537 | } |
| 538 | |
| 539 | PJ_INLINE(Word32) L_shl_nocheck (Word32 L_var1, Word16 var2) |
| 540 | { |
| 541 | #if PJ_HAS_INT64 |
| 542 | return L_saturate( ((pj_int64_t)L_var1) << var2 ); |
| 543 | #else |
| 544 | for (; var2 > 0; var2--) |
| 545 | { |
| 546 | if (L_var1 > (Word32) 0X3fffffffL) |
| 547 | { |
| 548 | SET_OVERFLOW(1); |
| 549 | return MAX_32; |
| 550 | } |
| 551 | else |
| 552 | { |
| 553 | if (L_var1 < (Word32) 0xc0000000L) |
| 554 | { |
| 555 | SET_OVERFLOW(1); |
| 556 | return MIN_32; |
| 557 | } |
| 558 | } |
| 559 | L_var1 <<= 1; |
| 560 | } |
| 561 | return (L_var1); |
| 562 | #endif |
| 563 | } |
| 564 | |
| 565 | PJ_INLINE(Word32) L_shr (Word32 L_var1, Word16 var2) |
| 566 | { |
| 567 | if (var2 < 0) |
| 568 | { |
| 569 | if (var2 < -32) |
| 570 | var2 = -32; |
| 571 | return L_shl_nocheck (L_var1, (Word16) -var2); |
| 572 | } |
| 573 | else |
| 574 | { |
| 575 | return L_shr_nocheck(L_var1, var2); |
| 576 | } |
| 577 | } |
| 578 | /* ------------------------- End of L_shr() ------------------------- */ |
| 579 | |
| 580 | /*___________________________________________________________________________ |
| 581 | | | |
| 582 | | Function Name : L_shl | |
| 583 | | | |
| 584 | | Purpose : | |
| 585 | | | |
| 586 | | Arithmetically shift the 32 bit input L_var1 left var2 positions. Zero | |
| 587 | | fill the var2 LSB of the result. If var2 is negative, arithmetically | |
| 588 | | shift L_var1 right by -var2 with sign extension. Saturate the result in | |
| 589 | | case of underflows or overflows. | |
| 590 | | | |
| 591 | | Complexity weight : 2 | |
| 592 | | | |
| 593 | | Inputs : | |
| 594 | | | |
| 595 | | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| 596 | | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| 597 | | | |
| 598 | | var2 | |
| 599 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 600 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 601 | | | |
| 602 | | Outputs : | |
| 603 | | | |
| 604 | | none | |
| 605 | | | |
| 606 | | Return Value : | |
| 607 | | | |
| 608 | | L_var_out | |
| 609 | | 32 bit long signed integer (Word32) whose value falls in the | |
| 610 | | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| 611 | |___________________________________________________________________________| |
| 612 | */ |
| 613 | PJ_INLINE(Word32) L_shl (Word32 L_var1, Word16 var2) |
| 614 | { |
| 615 | if (var2 <= 0) |
| 616 | { |
| 617 | if (var2 < -32) |
| 618 | var2 = -32; |
| 619 | return L_shr_nocheck(L_var1, (Word16) -var2); |
| 620 | } |
| 621 | else |
| 622 | { |
| 623 | return L_shl_nocheck(L_var1, var2); |
| 624 | } |
| 625 | } |
| 626 | /* ------------------------- End of L_shl() ------------------------- */ |
| 627 | |
| 628 | |
| 629 | /*___________________________________________________________________________ |
| 630 | | | |
| 631 | | Function Name : abs_s | |
| 632 | | | |
| 633 | | Purpose : | |
| 634 | | | |
| 635 | | Absolute value of var1; abs_s(-32768) = 32767. | |
| 636 | | | |
| 637 | | Complexity weight : 1 | |
| 638 | | | |
| 639 | | Inputs : | |
| 640 | | | |
| 641 | | var1 | |
| 642 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 643 | | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| 644 | | | |
| 645 | | Outputs : | |
| 646 | | | |
| 647 | | none | |
| 648 | | | |
| 649 | | Return Value : | |
| 650 | | | |
| 651 | | var_out | |
| 652 | | 16 bit short signed integer (Word16) whose value falls in the | |
| 653 | | range : 0x0000 0000 <= var_out <= 0x0000 7fff. | |
| 654 | |___________________________________________________________________________| |
| 655 | */ |
| 656 | PJ_INLINE(Word16) abs_s (Word16 var1) |
| 657 | { |
| 658 | #if 1 |
| 659 | if (var1 >= 0) |
| 660 | return var1; |
| 661 | else if (var1 == MIN_16) |
| 662 | return MAX_16; |
| 663 | else |
| 664 | return (Word16)-var1; |
| 665 | #else |
| 666 | if (var1 == MIN_16) |
| 667 | { |
| 668 | return MAX_16; |
| 669 | } |
| 670 | else |
| 671 | { |
| 672 | if (var1 < 0) |
| 673 | { |
| 674 | return (Word16)-var1; |
| 675 | } |
| 676 | else |
| 677 | { |
| 678 | return var1; |
| 679 | } |
| 680 | } |
| 681 | #endif |
| 682 | } |
| 683 | /* ------------------------- End of abs_s() ------------------------- */ |
| 684 | |
| 685 | |
| 686 | PJ_INLINE(Word16) shl_nocheck(Word16 var1, Word16 var2) |
| 687 | { |
| 688 | #if 1 |
| 689 | /* blp: this should be more optimized */ |
| 690 | return saturate (((Word32)var1) << var2); |
| 691 | #else |
| 692 | /* Original algorithm */ |
| 693 | Word32 result = (Word32) var1 *((Word32) 1 << var2); |
| 694 | |
| 695 | if ((var2 > 15 && var1 != 0) || (result != (Word32) ((Word16) result))) |
| 696 | { |
| 697 | SET_OVERFLOW(1); |
| 698 | return (Word16) ((var1 > 0) ? MAX_16 : MIN_16); |
| 699 | } |
| 700 | else |
| 701 | { |
| 702 | return extract_l (result); |
| 703 | } |
| 704 | #endif |
| 705 | } |
| 706 | |
| 707 | PJ_INLINE(Word16) shr_nocheck(Word16 var1, Word16 var2) |
| 708 | { |
| 709 | #if 1 |
| 710 | /* blp: this should yield the same value */ |
| 711 | return (Word16) (var1 >> var2); |
| 712 | #else |
| 713 | /* Original algorithm */ |
| 714 | if (var2 >= 15) |
| 715 | { |
| 716 | return (Word16)((var1 < 0) ? -1 : 0); |
| 717 | } |
| 718 | else |
| 719 | { |
| 720 | if (var1 < 0) |
| 721 | { |
| 722 | return (Word16) (~((~var1) >> var2)); |
| 723 | } |
| 724 | else |
| 725 | { |
| 726 | return (Word16)(var1 >> var2); |
| 727 | } |
| 728 | } |
| 729 | #endif |
| 730 | } |