1 #ifndef _DEINT32_H 2 #define _DEINT32_H 3 /*------------------------------------------------------------------------- 4 * drawElements Base Portability Library 5 * ------------------------------------- 6 * 7 * Copyright 2014 The Android Open Source Project 8 * 9 * Licensed under the Apache License, Version 2.0 (the "License"); 10 * you may not use this file except in compliance with the License. 11 * You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 * 21 *//*! 22 * \file 23 * \brief 32-bit integer math. 24 *//*--------------------------------------------------------------------*/ 25 26 #include "deDefs.h" 27 28 #if (DE_COMPILER == DE_COMPILER_MSC) 29 # include <intrin.h> 30 #endif 31 32 DE_BEGIN_EXTERN_C 33 34 enum 35 { 36 DE_RCP_FRAC_BITS = 30 /*!< Number of fractional bits in deRcp32() result. */ 37 }; 38 39 void deRcp32 (deUint32 a, deUint32* rcp, int* exp); 40 void deInt32_computeLUTs (void); 41 void deInt32_selfTest (void); 42 43 /*--------------------------------------------------------------------*//*! 44 * \brief Compute the absolute of an int. 45 * \param a Input value. 46 * \return Absolute of the input value. 47 * 48 * \note The input 0x80000000u (for which the abs value cannot be 49 * represented), is asserted and returns the value itself. 50 *//*--------------------------------------------------------------------*/ 51 DE_INLINE int deAbs32 (int a) 52 { 53 DE_ASSERT((unsigned int) a != 0x80000000u); 54 return (a < 0) ? -a : a; 55 } 56 57 /*--------------------------------------------------------------------*//*! 58 * \brief Compute the signed minimum of two values. 59 * \param a First input value. 60 * \param b Second input value. 61 * \return The smallest of the two input values. 62 *//*--------------------------------------------------------------------*/ 63 DE_INLINE int deMin32 (int a, int b) 64 { 65 return (a <= b) ? a : b; 66 } 67 68 /*--------------------------------------------------------------------*//*! 69 * \brief Compute the signed maximum of two values. 70 * \param a First input value. 71 * \param b Second input value. 72 * \return The largest of the two input values. 73 *//*--------------------------------------------------------------------*/ 74 DE_INLINE int deMax32 (int a, int b) 75 { 76 return (a >= b) ? a : b; 77 } 78 79 /*--------------------------------------------------------------------*//*! 80 * \brief Compute the unsigned minimum of two values. 81 * \param a First input value. 82 * \param b Second input value. 83 * \return The smallest of the two input values. 84 *//*--------------------------------------------------------------------*/ 85 DE_INLINE deUint32 deMinu32 (deUint32 a, deUint32 b) 86 { 87 return (a <= b) ? a : b; 88 } 89 90 /*--------------------------------------------------------------------*//*! 91 * \brief Compute the unsigned maximum of two values. 92 * \param a First input value. 93 * \param b Second input value. 94 * \return The largest of the two input values. 95 *//*--------------------------------------------------------------------*/ 96 DE_INLINE deUint32 deMaxu32 (deUint32 a, deUint32 b) 97 { 98 return (a >= b) ? a : b; 99 } 100 101 /*--------------------------------------------------------------------*//*! 102 * \brief Check if a value is in the <b>inclusive<b> range [mn, mx]. 103 * \param a Value to check for range. 104 * \param mn Range minimum value. 105 * \param mx Range maximum value. 106 * \return True if (a >= mn) and (a <= mx), false otherwise. 107 * 108 * \see deInBounds32() 109 *//*--------------------------------------------------------------------*/ 110 DE_INLINE deBool deInRange32 (int a, int mn, int mx) 111 { 112 return (a >= mn) && (a <= mx); 113 } 114 115 /*--------------------------------------------------------------------*//*! 116 * \brief Check if a value is in the half-inclusive bounds [mn, mx[. 117 * \param a Value to check for range. 118 * \param mn Range minimum value. 119 * \param mx Range maximum value. 120 * \return True if (a >= mn) and (a < mx), false otherwise. 121 * 122 * \see deInRange32() 123 *//*--------------------------------------------------------------------*/ 124 DE_INLINE deBool deInBounds32 (int a, int mn, int mx) 125 { 126 return (a >= mn) && (a < mx); 127 } 128 129 /*--------------------------------------------------------------------*//*! 130 * \brief Clamp a value into the range [mn, mx]. 131 * \param a Value to clamp. 132 * \param mn Minimum value. 133 * \param mx Maximum value. 134 * \return The clamped value in [mn, mx] range. 135 *//*--------------------------------------------------------------------*/ 136 DE_INLINE int deClamp32 (int a, int mn, int mx) 137 { 138 DE_ASSERT(mn <= mx); 139 if (a < mn) return mn; 140 if (a > mx) return mx; 141 return a; 142 } 143 144 /*--------------------------------------------------------------------*//*! 145 * \brief Get the sign of an integer. 146 * \param a Input value. 147 * \return +1 if a>0, 0 if a==0, -1 if a<0. 148 *//*--------------------------------------------------------------------*/ 149 DE_INLINE int deSign32 (int a) 150 { 151 if (a > 0) return +1; 152 if (a < 0) return -1; 153 return 0; 154 } 155 156 /*--------------------------------------------------------------------*//*! 157 * \brief Extract the sign bit of a. 158 * \param a Input value. 159 * \return 0x80000000 if a<0, 0 otherwise. 160 *//*--------------------------------------------------------------------*/ 161 DE_INLINE deInt32 deSignBit32 (deInt32 a) 162 { 163 return (deInt32)((deUint32)a & 0x80000000u); 164 } 165 166 /*--------------------------------------------------------------------*//*! 167 * \brief Integer rotate right. 168 * \param val Value to rotate. 169 * \param r Number of bits to rotate (in range [0, 32]). 170 * \return The rotated value. 171 *//*--------------------------------------------------------------------*/ 172 DE_INLINE int deRor32 (int val, int r) 173 { 174 DE_ASSERT(r >= 0 && r <= 32); 175 if (r == 0 || r == 32) 176 return val; 177 else 178 return (int)(((deUint32)val >> r) | ((deUint32)val << (32-r))); 179 } 180 181 /*--------------------------------------------------------------------*//*! 182 * \brief Integer rotate left. 183 * \param val Value to rotate. 184 * \param r Number of bits to rotate (in range [0, 32]). 185 * \return The rotated value. 186 *//*--------------------------------------------------------------------*/ 187 DE_INLINE int deRol32 (int val, int r) 188 { 189 DE_ASSERT(r >= 0 && r <= 32); 190 if (r == 0 || r == 32) 191 return val; 192 else 193 return (int)(((deUint32)val << r) | ((deUint32)val >> (32-r))); 194 } 195 196 /*--------------------------------------------------------------------*//*! 197 * \brief Check if a value is a power-of-two. 198 * \param a Input value. 199 * \return True if input is a power-of-two value, false otherwise. 200 * 201 * \note Also returns true for zero. 202 *//*--------------------------------------------------------------------*/ 203 DE_INLINE deBool deIsPowerOfTwo32 (int a) 204 { 205 return ((a & (a - 1)) == 0); 206 } 207 208 /*--------------------------------------------------------------------*//*! 209 * \brief Check if a value is a power-of-two. 210 * \param a Input value. 211 * \return True if input is a power-of-two value, false otherwise. 212 * 213 * \note Also returns true for zero. 214 *//*--------------------------------------------------------------------*/ 215 DE_INLINE deBool deIsPowerOfTwo64 (deUint64 a) 216 { 217 return ((a & (a - 1ull)) == 0); 218 } 219 220 /*--------------------------------------------------------------------*//*! 221 * \brief Check if a value is a power-of-two. 222 * \param a Input value. 223 * \return True if input is a power-of-two value, false otherwise. 224 * 225 * \note Also returns true for zero. 226 *//*--------------------------------------------------------------------*/ 227 DE_INLINE deBool deIsPowerOfTwoSize (size_t a) 228 { 229 #if (DE_PTR_SIZE == 4) 230 return deIsPowerOfTwo32(a); 231 #elif (DE_PTR_SIZE == 8) 232 return deIsPowerOfTwo64(a); 233 #else 234 # error "Invalid DE_PTR_SIZE" 235 #endif 236 } 237 238 /*--------------------------------------------------------------------*//*! 239 * \brief Check if an integer is aligned to given power-of-two size. 240 * \param a Input value. 241 * \param align Alignment to check for. 242 * \return True if input is aligned, false otherwise. 243 *//*--------------------------------------------------------------------*/ 244 DE_INLINE deBool deIsAligned32 (int a, int align) 245 { 246 DE_ASSERT(deIsPowerOfTwo32(align)); 247 return ((a & (align-1)) == 0); 248 } 249 250 /*--------------------------------------------------------------------*//*! 251 * \brief Check if a pointer is aligned to given power-of-two size. 252 * \param ptr Input pointer. 253 * \param align Alignment to check for (power-of-two). 254 * \return True if input is aligned, false otherwise. 255 *//*--------------------------------------------------------------------*/ 256 DE_INLINE deBool deIsAlignedPtr (const void* ptr, deUintptr align) 257 { 258 DE_ASSERT((align & (align-1)) == 0); /* power of two */ 259 return (((deUintptr)ptr & (align-1)) == 0); 260 } 261 262 /*--------------------------------------------------------------------*//*! 263 * \brief Align an integer to given power-of-two size. 264 * \param val Input to align. 265 * \param align Alignment to check for (power-of-two). 266 * \return The aligned value (larger or equal to input). 267 *//*--------------------------------------------------------------------*/ 268 DE_INLINE deInt32 deAlign32 (deInt32 val, deInt32 align) 269 { 270 DE_ASSERT(deIsPowerOfTwo32(align)); 271 return (val + align - 1) & ~(align - 1); 272 } 273 274 /*--------------------------------------------------------------------*//*! 275 * \brief Align a pointer to given power-of-two size. 276 * \param ptr Input pointer to align. 277 * \param align Alignment to check for (power-of-two). 278 * \return The aligned pointer (larger or equal to input). 279 *//*--------------------------------------------------------------------*/ 280 DE_INLINE void* deAlignPtr (void* ptr, deUintptr align) 281 { 282 deUintptr val = (deUintptr)ptr; 283 DE_ASSERT((align & (align-1)) == 0); /* power of two */ 284 return (void*)((val + align - 1) & ~(align - 1)); 285 } 286 287 /*--------------------------------------------------------------------*//*! 288 * \brief Align a size_t value to given power-of-two size. 289 * \param ptr Input value to align. 290 * \param align Alignment to check for (power-of-two). 291 * \return The aligned size (larger or equal to input). 292 *//*--------------------------------------------------------------------*/ 293 DE_INLINE size_t deAlignSize (size_t val, size_t align) 294 { 295 DE_ASSERT(deIsPowerOfTwoSize(align)); 296 return (val + align - 1) & ~(align - 1); 297 } 298 299 extern const deInt8 g_clzLUT[256]; 300 301 /*--------------------------------------------------------------------*//*! 302 * \brief Compute number of leading zeros in an integer. 303 * \param a Input value. 304 * \return The number of leading zero bits in the input. 305 *//*--------------------------------------------------------------------*/ 306 DE_INLINE int deClz32 (deUint32 a) 307 { 308 #if (DE_COMPILER == DE_COMPILER_MSC) 309 unsigned long i; 310 if (_BitScanReverse(&i, (unsigned long)a) == 0) 311 return 32; 312 else 313 return 31-i; 314 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG) 315 if (a == 0) 316 return 32; 317 else 318 return __builtin_clz((unsigned int)a); 319 #else 320 if ((a & 0xFF000000u) != 0) 321 return (int)g_clzLUT[a >> 24]; 322 if ((a & 0x00FF0000u) != 0) 323 return 8 + (int)g_clzLUT[a >> 16]; 324 if ((a & 0x0000FF00u) != 0) 325 return 16 + (int)g_clzLUT[a >> 8]; 326 return 24 + (int)g_clzLUT[a]; 327 #endif 328 } 329 330 extern const deInt8 g_ctzLUT[256]; 331 332 /*--------------------------------------------------------------------*//*! 333 * \brief Compute number of trailing zeros in an integer. 334 * \param a Input value. 335 * \return The number of trailing zero bits in the input. 336 *//*--------------------------------------------------------------------*/ 337 DE_INLINE int deCtz32 (deUint32 a) 338 { 339 #if (DE_COMPILER == DE_COMPILER_MSC) 340 unsigned long i; 341 if (_BitScanForward(&i, (unsigned long)a) == 0) 342 return 32; 343 else 344 return i; 345 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG) 346 if (a == 0) 347 return 32; 348 else 349 return __builtin_ctz((unsigned int)a); 350 #else 351 if ((a & 0x00FFFFFFu) == 0) 352 return (int)g_ctzLUT[a >> 24] + 24; 353 if ((a & 0x0000FFFFu) == 0) 354 return (int)g_ctzLUT[(a >> 16) & 0xffu] + 16; 355 if ((a & 0x000000FFu) == 0) 356 return (int)g_ctzLUT[(a >> 8) & 0xffu] + 8; 357 return (int)g_ctzLUT[a & 0xffu]; 358 #endif 359 } 360 361 /*--------------------------------------------------------------------*//*! 362 * \brief Compute integer 'floor' of 'log2' for a positive integer. 363 * \param a Input value. 364 * \return floor(log2(a)). 365 *//*--------------------------------------------------------------------*/ 366 DE_INLINE int deLog2Floor32 (deInt32 a) 367 { 368 DE_ASSERT(a > 0); 369 return 31 - deClz32((deUint32)a); 370 } 371 372 /*--------------------------------------------------------------------*//*! 373 * \brief Compute integer 'ceil' of 'log2' for a positive integer. 374 * \param a Input value. 375 * \return ceil(log2(a)). 376 *//*--------------------------------------------------------------------*/ 377 DE_INLINE int deLog2Ceil32 (deInt32 a) 378 { 379 int log2floor = deLog2Floor32(a); 380 if (deIsPowerOfTwo32(a)) 381 return log2floor; 382 else 383 return log2floor+1; 384 } 385 386 /* \todo [2012-04-28 pyry] Badly named, deprecated variant of deLog2Ceil32(). Remove once code has been fixed. */ 387 DE_INLINE deUint32 deLog2Clz(deInt32 a) 388 { 389 return (deUint32)deLog2Ceil32(a); 390 } 391 392 /*--------------------------------------------------------------------*//*! 393 * \brief Compute the bit population count of an integer. 394 * \param a Input value. 395 * \return The number of one bits in the input. 396 *//*--------------------------------------------------------------------*/ 397 DE_INLINE int dePop32 (deUint32 a) 398 { 399 deUint32 mask0 = 0x55555555; /* 1-bit values. */ 400 deUint32 mask1 = 0x33333333; /* 2-bit values. */ 401 deUint32 mask2 = 0x0f0f0f0f; /* 4-bit values. */ 402 deUint32 mask3 = 0x00ff00ff; /* 8-bit values. */ 403 deUint32 mask4 = 0x0000ffff; /* 16-bit values. */ 404 deUint32 t = (deUint32)a; 405 t = (t & mask0) + ((t>>1) & mask0); 406 t = (t & mask1) + ((t>>2) & mask1); 407 t = (t & mask2) + ((t>>4) & mask2); 408 t = (t & mask3) + ((t>>8) & mask3); 409 t = (t & mask4) + (t>>16); 410 return (int)t; 411 } 412 413 DE_INLINE int dePop64 (deUint64 a) 414 { 415 return dePop32((deUint32)(a & 0xffffffffull)) + dePop32((deUint32)(a >> 32)); 416 } 417 418 /*--------------------------------------------------------------------*//*! 419 * \brief Reverse bytes in 32-bit integer (for example MSB -> LSB). 420 * \param a Input value. 421 * \return The input with bytes reversed 422 *//*--------------------------------------------------------------------*/ 423 DE_INLINE deUint32 deReverseBytes32 (deUint32 v) 424 { 425 deUint32 b0 = v << 24; 426 deUint32 b1 = (v & 0x0000ff00) << 8; 427 deUint32 b2 = (v & 0x00ff0000) >> 8; 428 deUint32 b3 = v >> 24; 429 return b0|b1|b2|b3; 430 } 431 432 /*--------------------------------------------------------------------*//*! 433 * \brief Reverse bytes in 16-bit integer (for example MSB -> LSB). 434 * \param a Input value. 435 * \return The input with bytes reversed 436 *//*--------------------------------------------------------------------*/ 437 DE_INLINE deUint16 deReverseBytes16 (deUint16 v) 438 { 439 return (deUint16)((v << 8) | (v >> 8)); 440 } 441 442 DE_INLINE deInt32 deSafeMul32 (deInt32 a, deInt32 b) 443 { 444 deInt32 res = a * b; 445 DE_ASSERT((deInt64)res == ((deInt64)a * (deInt64)b)); 446 return res; 447 } 448 449 DE_INLINE deInt32 deSafeAdd32 (deInt32 a, deInt32 b) 450 { 451 DE_ASSERT((deInt64)a + (deInt64)b == (deInt64)(a + b)); 452 return (a + b); 453 } 454 455 DE_INLINE deInt32 deDivRoundUp32 (deInt32 a, deInt32 b) 456 { 457 return a/b + ((a%b) ? 1 : 0); 458 } 459 460 /* \todo [petri] Move to deInt64.h? */ 461 462 DE_INLINE deInt32 deMulAsr32 (deInt32 a, deInt32 b, int shift) 463 { 464 return (deInt32)(((deInt64)a * (deInt64)b) >> shift); 465 } 466 467 DE_INLINE deInt32 deSafeMulAsr32 (deInt32 a, deInt32 b, int shift) 468 { 469 deInt64 res = ((deInt64)a * (deInt64)b) >> shift; 470 DE_ASSERT(res == (deInt64)(deInt32)res); 471 return (deInt32)res; 472 } 473 474 DE_INLINE deUint32 deSafeMuluAsr32 (deUint32 a, deUint32 b, int shift) 475 { 476 deUint64 res = ((deUint64)a * (deUint64)b) >> shift; 477 DE_ASSERT(res == (deUint64)(deUint32)res); 478 return (deUint32)res; 479 } 480 481 DE_INLINE deInt64 deMul32_32_64 (deInt32 a, deInt32 b) 482 { 483 return ((deInt64)a * (deInt64)b); 484 } 485 486 DE_INLINE deInt64 deAbs64 (deInt64 a) 487 { 488 DE_ASSERT((deUint64) a != 0x8000000000000000LL); 489 return (a >= 0) ? a : -a; 490 } 491 492 DE_INLINE int deClz64 (deUint64 a) 493 { 494 if ((a >> 32) != 0) 495 return deClz32((deUint32)(a >> 32)); 496 return deClz32((deUint32)a) + 32; 497 } 498 499 /* Common hash & compare functions. */ 500 501 DE_INLINE deUint32 deInt32Hash (deInt32 a) 502 { 503 /* From: http://www.concentric.net/~Ttwang/tech/inthash.htm */ 504 deUint32 key = (deUint32)a; 505 key = (key ^ 61) ^ (key >> 16); 506 key = key + (key << 3); 507 key = key ^ (key >> 4); 508 key = key * 0x27d4eb2d; /* prime/odd constant */ 509 key = key ^ (key >> 15); 510 return key; 511 } 512 513 DE_INLINE deUint32 deInt64Hash (deInt64 a) 514 { 515 /* From: http://www.concentric.net/~Ttwang/tech/inthash.htm */ 516 deUint64 key = (deUint64)a; 517 key = (~key) + (key << 21); /* key = (key << 21) - key - 1; */ 518 key = key ^ (key >> 24); 519 key = (key + (key << 3)) + (key << 8); /* key * 265 */ 520 key = key ^ (key >> 14); 521 key = (key + (key << 2)) + (key << 4); /* key * 21 */ 522 key = key ^ (key >> 28); 523 key = key + (key << 31); 524 return (deUint32)key; 525 } 526 527 DE_INLINE deUint32 deInt16Hash (deInt16 v) { return deInt32Hash(v); } 528 DE_INLINE deUint32 deUint16Hash (deUint16 v) { return deInt32Hash((deInt32)v); } 529 DE_INLINE deUint32 deUint32Hash (deUint32 v) { return deInt32Hash((deInt32)v); } 530 DE_INLINE deUint32 deUint64Hash (deUint64 v) { return deInt64Hash((deInt64)v); } 531 532 DE_INLINE deBool deInt16Equal (deInt16 a, deInt16 b) { return (a == b); } 533 DE_INLINE deBool deUint16Equal (deUint16 a, deUint16 b) { return (a == b); } 534 DE_INLINE deBool deInt32Equal (deInt32 a, deInt32 b) { return (a == b); } 535 DE_INLINE deBool deUint32Equal (deUint32 a, deUint32 b) { return (a == b); } 536 DE_INLINE deBool deInt64Equal (deInt64 a, deInt64 b) { return (a == b); } 537 DE_INLINE deBool deUint64Equal (deUint64 a, deUint64 b) { return (a == b); } 538 539 DE_INLINE deUint32 dePointerHash (const void* ptr) 540 { 541 deUintptr val = (deUintptr)ptr; 542 #if (DE_PTR_SIZE == 4) 543 return deInt32Hash((int)val); 544 #elif (DE_PTR_SIZE == 8) 545 return deInt64Hash((deInt64)val); 546 #else 547 # error Unsupported pointer size. 548 #endif 549 } 550 551 DE_INLINE deBool dePointerEqual (const void* a, const void* b) 552 { 553 return (a == b); 554 } 555 556 /** 557 * \brief Modulo that generates the same sign as divisor and rounds toward 558 * negative infinity -- assuming c99 %-operator. 559 */ 560 DE_INLINE deInt32 deInt32ModF (deInt32 n, deInt32 d) 561 { 562 deInt32 r = n%d; 563 if ((r > 0 && d < 0) || (r < 0 && d > 0)) r = r+d; 564 return r; 565 } 566 567 DE_INLINE deBool deInt64InInt32Range (deInt64 x) 568 { 569 return ((x >= (((deInt64)((deInt32)(-0x7FFFFFFF - 1))))) && (x <= ((1ll<<31)-1))); 570 } 571 572 573 DE_INLINE deUint32 deBitMask32 (int leastSignificantBitNdx, int numBits) 574 { 575 DE_ASSERT(deInRange32(leastSignificantBitNdx, 0, 32)); 576 DE_ASSERT(deInRange32(numBits, 0, 32)); 577 DE_ASSERT(deInRange32(leastSignificantBitNdx+numBits, 0, 32)); 578 579 if (numBits < 32 && leastSignificantBitNdx < 32) 580 return ((1u<<numBits)-1u) << (deUint32)leastSignificantBitNdx; 581 else if (numBits == 0 && leastSignificantBitNdx == 32) 582 return 0u; 583 else 584 { 585 DE_ASSERT(numBits == 32 && leastSignificantBitNdx == 0); 586 return 0xFFFFFFFFu; 587 } 588 } 589 590 DE_INLINE deUint32 deUintMaxValue32 (int numBits) 591 { 592 DE_ASSERT(deInRange32(numBits, 1, 32)); 593 if (numBits < 32) 594 return ((1u<<numBits)-1u); 595 else 596 return 0xFFFFFFFFu; 597 } 598 599 DE_INLINE deInt32 deIntMaxValue32 (int numBits) 600 { 601 DE_ASSERT(deInRange32(numBits, 1, 32)); 602 if (numBits < 32) 603 return ((deInt32)1 << (numBits - 1)) - 1; 604 else 605 { 606 /* avoid undefined behavior of int overflow when shifting */ 607 return 0x7FFFFFFF; 608 } 609 } 610 611 DE_INLINE deInt32 deIntMinValue32 (int numBits) 612 { 613 DE_ASSERT(deInRange32(numBits, 1, 32)); 614 if (numBits < 32) 615 return -((deInt32)1 << (numBits - 1)); 616 else 617 { 618 /* avoid undefined behavior of int overflow when shifting */ 619 return (deInt32)(-0x7FFFFFFF - 1); 620 } 621 } 622 623 DE_INLINE deInt32 deSignExtendTo32 (deInt32 value, int numBits) 624 { 625 DE_ASSERT(deInRange32(numBits, 1, 32)); 626 627 if (numBits < 32) 628 { 629 deBool signSet = ((deUint32)value & (1u<<(numBits-1))) != 0; 630 deUint32 signMask = deBitMask32(numBits, 32-numBits); 631 632 DE_ASSERT(((deUint32)value & signMask) == 0u); 633 634 return (deInt32)((deUint32)value | (signSet ? signMask : 0u)); 635 } 636 else 637 return value; 638 } 639 640 DE_END_EXTERN_C 641 642 #endif /* _DEINT32_H */ 643
