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 *//*--------------------------------------------------------------------*/
deAbs32(int a)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 *//*--------------------------------------------------------------------*/
deMin32(int a,int b)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 *//*--------------------------------------------------------------------*/
deMax32(int a,int b)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 *//*--------------------------------------------------------------------*/
deMinu32(deUint32 a,deUint32 b)85 DE_INLINE deUint32 deMinu32 (deUint32 a, deUint32 b)
86 {
87 return (a <= b) ? a : b;
88 }
89
90 /*--------------------------------------------------------------------*//*!
91 * \brief Compute the unsigned minimum of two values.
92 * \param a First input value.
93 * \param b Second input value.
94 * \return The smallest of the two input values.
95 *//*--------------------------------------------------------------------*/
deMinu64(deUint64 a,deUint64 b)96 DE_INLINE deUint64 deMinu64 (deUint64 a, deUint64 b)
97 {
98 return (a <= b) ? a : b;
99 }
100
101 /*--------------------------------------------------------------------*//*!
102 * \brief Compute the unsigned maximum of two values.
103 * \param a First input value.
104 * \param b Second input value.
105 * \return The largest of the two input values.
106 *//*--------------------------------------------------------------------*/
deMaxu32(deUint32 a,deUint32 b)107 DE_INLINE deUint32 deMaxu32 (deUint32 a, deUint32 b)
108 {
109 return (a >= b) ? a : b;
110 }
111
112 /*--------------------------------------------------------------------*//*!
113 * \brief Check if a value is in the <b>inclusive<b> range [mn, mx].
114 * \param a Value to check for range.
115 * \param mn Range minimum value.
116 * \param mx Range maximum value.
117 * \return True if (a >= mn) and (a <= mx), false otherwise.
118 *
119 * \see deInBounds32()
120 *//*--------------------------------------------------------------------*/
deInRange32(int a,int mn,int mx)121 DE_INLINE deBool deInRange32 (int a, int mn, int mx)
122 {
123 return (a >= mn) && (a <= mx);
124 }
125
126 /*--------------------------------------------------------------------*//*!
127 * \brief Check if a value is in the half-inclusive bounds [mn, mx[.
128 * \param a Value to check for range.
129 * \param mn Range minimum value.
130 * \param mx Range maximum value.
131 * \return True if (a >= mn) and (a < mx), false otherwise.
132 *
133 * \see deInRange32()
134 *//*--------------------------------------------------------------------*/
deInBounds32(int a,int mn,int mx)135 DE_INLINE deBool deInBounds32 (int a, int mn, int mx)
136 {
137 return (a >= mn) && (a < mx);
138 }
139
140 /*--------------------------------------------------------------------*//*!
141 * \brief Clamp a value into the range [mn, mx].
142 * \param a Value to clamp.
143 * \param mn Minimum value.
144 * \param mx Maximum value.
145 * \return The clamped value in [mn, mx] range.
146 *//*--------------------------------------------------------------------*/
deClamp32(int a,int mn,int mx)147 DE_INLINE int deClamp32 (int a, int mn, int mx)
148 {
149 DE_ASSERT(mn <= mx);
150 if (a < mn) return mn;
151 if (a > mx) return mx;
152 return a;
153 }
154
155 /*--------------------------------------------------------------------*//*!
156 * \brief Get the sign of an integer.
157 * \param a Input value.
158 * \return +1 if a>0, 0 if a==0, -1 if a<0.
159 *//*--------------------------------------------------------------------*/
deSign32(int a)160 DE_INLINE int deSign32 (int a)
161 {
162 if (a > 0) return +1;
163 if (a < 0) return -1;
164 return 0;
165 }
166
167 /*--------------------------------------------------------------------*//*!
168 * \brief Extract the sign bit of a.
169 * \param a Input value.
170 * \return 0x80000000 if a<0, 0 otherwise.
171 *//*--------------------------------------------------------------------*/
deSignBit32(deInt32 a)172 DE_INLINE deInt32 deSignBit32 (deInt32 a)
173 {
174 return (deInt32)((deUint32)a & 0x80000000u);
175 }
176
177 /*--------------------------------------------------------------------*//*!
178 * \brief Integer rotate right.
179 * \param val Value to rotate.
180 * \param r Number of bits to rotate (in range [0, 32]).
181 * \return The rotated value.
182 *//*--------------------------------------------------------------------*/
deRor32(int val,int r)183 DE_INLINE int deRor32 (int val, int r)
184 {
185 DE_ASSERT(r >= 0 && r <= 32);
186 if (r == 0 || r == 32)
187 return val;
188 else
189 return (int)(((deUint32)val >> r) | ((deUint32)val << (32-r)));
190 }
191
192 /*--------------------------------------------------------------------*//*!
193 * \brief Integer rotate left.
194 * \param val Value to rotate.
195 * \param r Number of bits to rotate (in range [0, 32]).
196 * \return The rotated value.
197 *//*--------------------------------------------------------------------*/
deRol32(int val,int r)198 DE_INLINE int deRol32 (int val, int r)
199 {
200 DE_ASSERT(r >= 0 && r <= 32);
201 if (r == 0 || r == 32)
202 return val;
203 else
204 return (int)(((deUint32)val << r) | ((deUint32)val >> (32-r)));
205 }
206
207 /*--------------------------------------------------------------------*//*!
208 * \brief Check if a value is a power-of-two.
209 * \param a Input value.
210 * \return True if input is a power-of-two value, false otherwise.
211 *
212 * \note Also returns true for zero.
213 *//*--------------------------------------------------------------------*/
deIsPowerOfTwo32(int a)214 DE_INLINE deBool deIsPowerOfTwo32 (int a)
215 {
216 return ((a & (a - 1)) == 0);
217 }
218
219 /*--------------------------------------------------------------------*//*!
220 * \brief Check if a value is a power-of-two.
221 * \param a Input value.
222 * \return True if input is a power-of-two value, false otherwise.
223 *
224 * \note Also returns true for zero.
225 *//*--------------------------------------------------------------------*/
deIsPowerOfTwo64(deUint64 a)226 DE_INLINE deBool deIsPowerOfTwo64 (deUint64 a)
227 {
228 return ((a & (a - 1ull)) == 0);
229 }
230
231 /*--------------------------------------------------------------------*//*!
232 * \brief Check if a value is a power-of-two.
233 * \param a Input value.
234 * \return True if input is a power-of-two value, false otherwise.
235 *
236 * \note Also returns true for zero.
237 *//*--------------------------------------------------------------------*/
deIsPowerOfTwoSize(size_t a)238 DE_INLINE deBool deIsPowerOfTwoSize (size_t a)
239 {
240 #if (DE_PTR_SIZE == 4)
241 return deIsPowerOfTwo32(a);
242 #elif (DE_PTR_SIZE == 8)
243 return deIsPowerOfTwo64(a);
244 #else
245 # error "Invalid DE_PTR_SIZE"
246 #endif
247 }
248
249 /*--------------------------------------------------------------------*//*!
250 * \brief Roud a value up to a power-of-two.
251 * \param a Input value.
252 * \return Smallest power-of-two value that is greater or equal to an input value.
253 *//*--------------------------------------------------------------------*/
deSmallestGreaterOrEquallPowerOfTwoU32(deUint32 a)254 DE_INLINE deUint32 deSmallestGreaterOrEquallPowerOfTwoU32 (deUint32 a)
255 {
256 --a;
257 a |= a >> 1u;
258 a |= a >> 2u;
259 a |= a >> 4u;
260 a |= a >> 8u;
261 a |= a >> 16u;
262 return ++a;
263 }
264
265 /*--------------------------------------------------------------------*//*!
266 * \brief Roud a value up to a power-of-two.
267 * \param a Input value.
268 * \return Smallest power-of-two value that is greater or equal to an input value.
269 *//*--------------------------------------------------------------------*/
deSmallestGreaterOrEquallPowerOfTwoU64(deUint64 a)270 DE_INLINE deUint64 deSmallestGreaterOrEquallPowerOfTwoU64 (deUint64 a)
271 {
272 --a;
273 a |= a >> 1u;
274 a |= a >> 2u;
275 a |= a >> 4u;
276 a |= a >> 8u;
277 a |= a >> 16u;
278 a |= a >> 32u;
279 return ++a;
280 }
281
282 /*--------------------------------------------------------------------*//*!
283 * \brief Roud a value up to a power-of-two.
284 * \param a Input value.
285 * \return Smallest power-of-two value that is greater or equal to an input value.
286 *//*--------------------------------------------------------------------*/
deSmallestGreaterOrEquallPowerOfTwoSize(size_t a)287 DE_INLINE size_t deSmallestGreaterOrEquallPowerOfTwoSize (size_t a)
288 {
289 #if (DE_PTR_SIZE == 4)
290 return deSmallestGreaterOrEquallPowerOfTwoU32(a);
291 #elif (DE_PTR_SIZE == 8)
292 return deSmallestGreaterOrEquallPowerOfTwoU64(a);
293 #else
294 # error "Invalid DE_PTR_SIZE"
295 #endif
296 }
297
298 /*--------------------------------------------------------------------*//*!
299 * \brief Check if an integer is aligned to given power-of-two size.
300 * \param a Input value.
301 * \param align Alignment to check for.
302 * \return True if input is aligned, false otherwise.
303 *//*--------------------------------------------------------------------*/
deIsAligned32(int a,int align)304 DE_INLINE deBool deIsAligned32 (int a, int align)
305 {
306 DE_ASSERT(deIsPowerOfTwo32(align));
307 return ((a & (align-1)) == 0);
308 }
309
310 /*--------------------------------------------------------------------*//*!
311 * \brief Check if an integer is aligned to given power-of-two size.
312 * \param a Input value.
313 * \param align Alignment to check for.
314 * \return True if input is aligned, false otherwise.
315 *//*--------------------------------------------------------------------*/
deIsAligned64(deInt64 a,deInt64 align)316 DE_INLINE deBool deIsAligned64 (deInt64 a, deInt64 align)
317 {
318 DE_ASSERT(deIsPowerOfTwo64(align));
319 return ((a & (align-1)) == 0);
320 }
321
322 /*--------------------------------------------------------------------*//*!
323 * \brief Check if a pointer is aligned to given power-of-two size.
324 * \param ptr Input pointer.
325 * \param align Alignment to check for (power-of-two).
326 * \return True if input is aligned, false otherwise.
327 *//*--------------------------------------------------------------------*/
deIsAlignedPtr(const void * ptr,deUintptr align)328 DE_INLINE deBool deIsAlignedPtr (const void* ptr, deUintptr align)
329 {
330 DE_ASSERT((align & (align-1)) == 0); /* power of two */
331 return (((deUintptr)ptr & (align-1)) == 0);
332 }
333
334 /*--------------------------------------------------------------------*//*!
335 * \brief Align an integer to given power-of-two size.
336 * \param val Input to align.
337 * \param align Alignment to check for (power-of-two).
338 * \return The aligned value (larger or equal to input).
339 *//*--------------------------------------------------------------------*/
deAlign32(deInt32 val,deInt32 align)340 DE_INLINE deInt32 deAlign32 (deInt32 val, deInt32 align)
341 {
342 DE_ASSERT(deIsPowerOfTwo32(align));
343 return (val + align - 1) & ~(align - 1);
344 }
345
346 /*--------------------------------------------------------------------*//*!
347 * \brief Align an integer to given power-of-two size.
348 * \param val Input to align.
349 * \param align Alignment to check for (power-of-two).
350 * \return The aligned value (larger or equal to input).
351 *//*--------------------------------------------------------------------*/
deAlign64(deInt64 val,deInt64 align)352 DE_INLINE deInt64 deAlign64 (deInt64 val, deInt64 align)
353 {
354 DE_ASSERT(deIsPowerOfTwo64(align));
355 return (val + align - 1) & ~(align - 1);
356 }
357
358 /*--------------------------------------------------------------------*//*!
359 * \brief Align a pointer to given power-of-two size.
360 * \param ptr Input pointer to align.
361 * \param align Alignment to check for (power-of-two).
362 * \return The aligned pointer (larger or equal to input).
363 *//*--------------------------------------------------------------------*/
deAlignPtr(void * ptr,deUintptr align)364 DE_INLINE void* deAlignPtr (void* ptr, deUintptr align)
365 {
366 deUintptr val = (deUintptr)ptr;
367 DE_ASSERT((align & (align-1)) == 0); /* power of two */
368 return (void*)((val + align - 1) & ~(align - 1));
369 }
370
371 /*--------------------------------------------------------------------*//*!
372 * \brief Align a size_t value to given power-of-two size.
373 * \param ptr Input value to align.
374 * \param align Alignment to check for (power-of-two).
375 * \return The aligned size (larger or equal to input).
376 *//*--------------------------------------------------------------------*/
deAlignSize(size_t val,size_t align)377 DE_INLINE size_t deAlignSize (size_t val, size_t align)
378 {
379 DE_ASSERT(deIsPowerOfTwoSize(align));
380 return (val + align - 1) & ~(align - 1);
381 }
382
383 extern const deInt8 g_clzLUT[256];
384
385 /*--------------------------------------------------------------------*//*!
386 * \brief Compute number of leading zeros in an integer.
387 * \param a Input value.
388 * \return The number of leading zero bits in the input.
389 *//*--------------------------------------------------------------------*/
deClz32(deUint32 a)390 DE_INLINE int deClz32 (deUint32 a)
391 {
392 #if (DE_COMPILER == DE_COMPILER_MSC)
393 unsigned long i;
394 if (_BitScanReverse(&i, (unsigned long)a) == 0)
395 return 32;
396 else
397 return 31-i;
398 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
399 if (a == 0)
400 return 32;
401 else
402 return __builtin_clz((unsigned int)a);
403 #else
404 if ((a & 0xFF000000u) != 0)
405 return (int)g_clzLUT[a >> 24];
406 if ((a & 0x00FF0000u) != 0)
407 return 8 + (int)g_clzLUT[a >> 16];
408 if ((a & 0x0000FF00u) != 0)
409 return 16 + (int)g_clzLUT[a >> 8];
410 return 24 + (int)g_clzLUT[a];
411 #endif
412 }
413
414 extern const deInt8 g_ctzLUT[256];
415
416 /*--------------------------------------------------------------------*//*!
417 * \brief Compute number of trailing zeros in an integer.
418 * \param a Input value.
419 * \return The number of trailing zero bits in the input.
420 *//*--------------------------------------------------------------------*/
deCtz32(deUint32 a)421 DE_INLINE int deCtz32 (deUint32 a)
422 {
423 #if (DE_COMPILER == DE_COMPILER_MSC)
424 unsigned long i;
425 if (_BitScanForward(&i, (unsigned long)a) == 0)
426 return 32;
427 else
428 return i;
429 #elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
430 if (a == 0)
431 return 32;
432 else
433 return __builtin_ctz((unsigned int)a);
434 #else
435 if ((a & 0x00FFFFFFu) == 0)
436 return (int)g_ctzLUT[a >> 24] + 24;
437 if ((a & 0x0000FFFFu) == 0)
438 return (int)g_ctzLUT[(a >> 16) & 0xffu] + 16;
439 if ((a & 0x000000FFu) == 0)
440 return (int)g_ctzLUT[(a >> 8) & 0xffu] + 8;
441 return (int)g_ctzLUT[a & 0xffu];
442 #endif
443 }
444
445 /*--------------------------------------------------------------------*//*!
446 * \brief Compute integer 'floor' of 'log2' for a positive integer.
447 * \param a Input value.
448 * \return floor(log2(a)).
449 *//*--------------------------------------------------------------------*/
deLog2Floor32(deInt32 a)450 DE_INLINE int deLog2Floor32 (deInt32 a)
451 {
452 DE_ASSERT(a > 0);
453 return 31 - deClz32((deUint32)a);
454 }
455
456 /*--------------------------------------------------------------------*//*!
457 * \brief Compute integer 'ceil' of 'log2' for a positive integer.
458 * \param a Input value.
459 * \return ceil(log2(a)).
460 *//*--------------------------------------------------------------------*/
deLog2Ceil32(deInt32 a)461 DE_INLINE int deLog2Ceil32 (deInt32 a)
462 {
463 int log2floor = deLog2Floor32(a);
464 if (deIsPowerOfTwo32(a))
465 return log2floor;
466 else
467 return log2floor+1;
468 }
469
470 /*--------------------------------------------------------------------*//*!
471 * \brief Compute the bit population count of an integer.
472 * \param a Input value.
473 * \return The number of one bits in the input.
474 *//*--------------------------------------------------------------------*/
dePop32(deUint32 a)475 DE_INLINE int dePop32 (deUint32 a)
476 {
477 deUint32 mask0 = 0x55555555; /* 1-bit values. */
478 deUint32 mask1 = 0x33333333; /* 2-bit values. */
479 deUint32 mask2 = 0x0f0f0f0f; /* 4-bit values. */
480 deUint32 mask3 = 0x00ff00ff; /* 8-bit values. */
481 deUint32 mask4 = 0x0000ffff; /* 16-bit values. */
482 deUint32 t = (deUint32)a;
483 t = (t & mask0) + ((t>>1) & mask0);
484 t = (t & mask1) + ((t>>2) & mask1);
485 t = (t & mask2) + ((t>>4) & mask2);
486 t = (t & mask3) + ((t>>8) & mask3);
487 t = (t & mask4) + (t>>16);
488 return (int)t;
489 }
490
dePop64(deUint64 a)491 DE_INLINE int dePop64 (deUint64 a)
492 {
493 return dePop32((deUint32)(a & 0xffffffffull)) + dePop32((deUint32)(a >> 32));
494 }
495
496 /*--------------------------------------------------------------------*//*!
497 * \brief Reverse bytes in 32-bit integer (for example MSB -> LSB).
498 * \param a Input value.
499 * \return The input with bytes reversed
500 *//*--------------------------------------------------------------------*/
deReverseBytes32(deUint32 v)501 DE_INLINE deUint32 deReverseBytes32 (deUint32 v)
502 {
503 deUint32 b0 = v << 24;
504 deUint32 b1 = (v & 0x0000ff00) << 8;
505 deUint32 b2 = (v & 0x00ff0000) >> 8;
506 deUint32 b3 = v >> 24;
507 return b0|b1|b2|b3;
508 }
509
510 /*--------------------------------------------------------------------*//*!
511 * \brief Reverse bytes in 16-bit integer (for example MSB -> LSB).
512 * \param a Input value.
513 * \return The input with bytes reversed
514 *//*--------------------------------------------------------------------*/
deReverseBytes16(deUint16 v)515 DE_INLINE deUint16 deReverseBytes16 (deUint16 v)
516 {
517 return (deUint16)((v << 8) | (v >> 8));
518 }
519
deSafeMul32(deInt32 a,deInt32 b)520 DE_INLINE deInt32 deSafeMul32 (deInt32 a, deInt32 b)
521 {
522 deInt32 res = a * b;
523 DE_ASSERT((deInt64)res == ((deInt64)a * (deInt64)b));
524 return res;
525 }
526
deSafeAdd32(deInt32 a,deInt32 b)527 DE_INLINE deInt32 deSafeAdd32 (deInt32 a, deInt32 b)
528 {
529 DE_ASSERT((deInt64)a + (deInt64)b == (deInt64)(a + b));
530 return (a + b);
531 }
532
deDivRoundUp32(deInt32 a,deInt32 b)533 DE_INLINE deInt32 deDivRoundUp32 (deInt32 a, deInt32 b)
534 {
535 return a/b + ((a%b) ? 1 : 0);
536 }
537
538 /* \todo [petri] Move to deInt64.h? */
539
deMulAsr32(deInt32 a,deInt32 b,int shift)540 DE_INLINE deInt32 deMulAsr32 (deInt32 a, deInt32 b, int shift)
541 {
542 return (deInt32)(((deInt64)a * (deInt64)b) >> shift);
543 }
544
deSafeMulAsr32(deInt32 a,deInt32 b,int shift)545 DE_INLINE deInt32 deSafeMulAsr32 (deInt32 a, deInt32 b, int shift)
546 {
547 deInt64 res = ((deInt64)a * (deInt64)b) >> shift;
548 DE_ASSERT(res == (deInt64)(deInt32)res);
549 return (deInt32)res;
550 }
551
deSafeMuluAsr32(deUint32 a,deUint32 b,int shift)552 DE_INLINE deUint32 deSafeMuluAsr32 (deUint32 a, deUint32 b, int shift)
553 {
554 deUint64 res = ((deUint64)a * (deUint64)b) >> shift;
555 DE_ASSERT(res == (deUint64)(deUint32)res);
556 return (deUint32)res;
557 }
558
deMul32_32_64(deInt32 a,deInt32 b)559 DE_INLINE deInt64 deMul32_32_64 (deInt32 a, deInt32 b)
560 {
561 return ((deInt64)a * (deInt64)b);
562 }
563
deAbs64(deInt64 a)564 DE_INLINE deInt64 deAbs64 (deInt64 a)
565 {
566 DE_ASSERT((deUint64) a != 0x8000000000000000LL);
567 return (a >= 0) ? a : -a;
568 }
569
deClz64(deUint64 a)570 DE_INLINE int deClz64 (deUint64 a)
571 {
572 if ((a >> 32) != 0)
573 return deClz32((deUint32)(a >> 32));
574 return deClz32((deUint32)a) + 32;
575 }
576
577 /* Common hash & compare functions. */
578
deInt32Hash(deInt32 a)579 DE_INLINE deUint32 deInt32Hash (deInt32 a)
580 {
581 /* From: http://www.concentric.net/~Ttwang/tech/inthash.htm */
582 deUint32 key = (deUint32)a;
583 key = (key ^ 61) ^ (key >> 16);
584 key = key + (key << 3);
585 key = key ^ (key >> 4);
586 key = key * 0x27d4eb2d; /* prime/odd constant */
587 key = key ^ (key >> 15);
588 return key;
589 }
590
deInt64Hash(deInt64 a)591 DE_INLINE deUint32 deInt64Hash (deInt64 a)
592 {
593 /* From: http://www.concentric.net/~Ttwang/tech/inthash.htm */
594 deUint64 key = (deUint64)a;
595 key = (~key) + (key << 21); /* key = (key << 21) - key - 1; */
596 key = key ^ (key >> 24);
597 key = (key + (key << 3)) + (key << 8); /* key * 265 */
598 key = key ^ (key >> 14);
599 key = (key + (key << 2)) + (key << 4); /* key * 21 */
600 key = key ^ (key >> 28);
601 key = key + (key << 31);
602 return (deUint32)key;
603 }
604
deInt16Hash(deInt16 v)605 DE_INLINE deUint32 deInt16Hash (deInt16 v) { return deInt32Hash(v); }
deUint16Hash(deUint16 v)606 DE_INLINE deUint32 deUint16Hash (deUint16 v) { return deInt32Hash((deInt32)v); }
deUint32Hash(deUint32 v)607 DE_INLINE deUint32 deUint32Hash (deUint32 v) { return deInt32Hash((deInt32)v); }
deUint64Hash(deUint64 v)608 DE_INLINE deUint32 deUint64Hash (deUint64 v) { return deInt64Hash((deInt64)v); }
609
deInt16Equal(deInt16 a,deInt16 b)610 DE_INLINE deBool deInt16Equal (deInt16 a, deInt16 b) { return (a == b); }
deUint16Equal(deUint16 a,deUint16 b)611 DE_INLINE deBool deUint16Equal (deUint16 a, deUint16 b) { return (a == b); }
deInt32Equal(deInt32 a,deInt32 b)612 DE_INLINE deBool deInt32Equal (deInt32 a, deInt32 b) { return (a == b); }
deUint32Equal(deUint32 a,deUint32 b)613 DE_INLINE deBool deUint32Equal (deUint32 a, deUint32 b) { return (a == b); }
deInt64Equal(deInt64 a,deInt64 b)614 DE_INLINE deBool deInt64Equal (deInt64 a, deInt64 b) { return (a == b); }
deUint64Equal(deUint64 a,deUint64 b)615 DE_INLINE deBool deUint64Equal (deUint64 a, deUint64 b) { return (a == b); }
616
dePointerHash(const void * ptr)617 DE_INLINE deUint32 dePointerHash (const void* ptr)
618 {
619 deUintptr val = (deUintptr)ptr;
620 #if (DE_PTR_SIZE == 4)
621 return deInt32Hash((int)val);
622 #elif (DE_PTR_SIZE == 8)
623 return deInt64Hash((deInt64)val);
624 #else
625 # error Unsupported pointer size.
626 #endif
627 }
628
dePointerEqual(const void * a,const void * b)629 DE_INLINE deBool dePointerEqual (const void* a, const void* b)
630 {
631 return (a == b);
632 }
633
634 /**
635 * \brief Modulo that generates the same sign as divisor and rounds toward
636 * negative infinity -- assuming c99 %-operator.
637 */
deInt32ModF(deInt32 n,deInt32 d)638 DE_INLINE deInt32 deInt32ModF (deInt32 n, deInt32 d)
639 {
640 deInt32 r = n%d;
641 if ((r > 0 && d < 0) || (r < 0 && d > 0)) r = r+d;
642 return r;
643 }
644
deInt64InInt32Range(deInt64 x)645 DE_INLINE deBool deInt64InInt32Range (deInt64 x)
646 {
647 return ((x >= (((deInt64)((deInt32)(-0x7FFFFFFF - 1))))) && (x <= ((1ll<<31)-1)));
648 }
649
650
deBitMask32(int leastSignificantBitNdx,int numBits)651 DE_INLINE deUint32 deBitMask32 (int leastSignificantBitNdx, int numBits)
652 {
653 DE_ASSERT(deInRange32(leastSignificantBitNdx, 0, 32));
654 DE_ASSERT(deInRange32(numBits, 0, 32));
655 DE_ASSERT(deInRange32(leastSignificantBitNdx+numBits, 0, 32));
656
657 if (numBits < 32 && leastSignificantBitNdx < 32)
658 return ((1u<<numBits)-1u) << (deUint32)leastSignificantBitNdx;
659 else if (numBits == 0 && leastSignificantBitNdx == 32)
660 return 0u;
661 else
662 {
663 DE_ASSERT(numBits == 32 && leastSignificantBitNdx == 0);
664 return 0xFFFFFFFFu;
665 }
666 }
667
deUintMaxValue32(int numBits)668 DE_INLINE deUint32 deUintMaxValue32 (int numBits)
669 {
670 DE_ASSERT(deInRange32(numBits, 1, 32));
671 if (numBits < 32)
672 return ((1u<<numBits)-1u);
673 else
674 return 0xFFFFFFFFu;
675 }
676
deIntMaxValue32(int numBits)677 DE_INLINE deInt32 deIntMaxValue32 (int numBits)
678 {
679 DE_ASSERT(deInRange32(numBits, 1, 32));
680 if (numBits < 32)
681 return ((deInt32)1 << (numBits - 1)) - 1;
682 else
683 {
684 /* avoid undefined behavior of int overflow when shifting */
685 return 0x7FFFFFFF;
686 }
687 }
688
deIntMinValue32(int numBits)689 DE_INLINE deInt32 deIntMinValue32 (int numBits)
690 {
691 DE_ASSERT(deInRange32(numBits, 1, 32));
692 if (numBits < 32)
693 return -((deInt32)1 << (numBits - 1));
694 else
695 {
696 /* avoid undefined behavior of int overflow when shifting */
697 return (deInt32)(-0x7FFFFFFF - 1);
698 }
699 }
700
deSignExtendTo32(deInt32 value,int numBits)701 DE_INLINE deInt32 deSignExtendTo32 (deInt32 value, int numBits)
702 {
703 DE_ASSERT(deInRange32(numBits, 1, 32));
704
705 if (numBits < 32)
706 {
707 deBool signSet = ((deUint32)value & (1u<<(numBits-1))) != 0;
708 deUint32 signMask = deBitMask32(numBits, 32-numBits);
709
710 DE_ASSERT(((deUint32)value & signMask) == 0u);
711
712 return (deInt32)((deUint32)value | (signSet ? signMask : 0u));
713 }
714 else
715 return value;
716 }
717
deIntIsPow2(int powerOf2)718 DE_INLINE int deIntIsPow2(int powerOf2)
719 {
720 if (powerOf2 <= 0)
721 return 0;
722 return (powerOf2 & (powerOf2 - (int)1)) == (int)0;
723 }
724
deIntRoundToPow2(int number,int powerOf2)725 DE_INLINE int deIntRoundToPow2(int number, int powerOf2)
726 {
727 DE_ASSERT(deIntIsPow2(powerOf2));
728 return (number + (int)powerOf2 - (int)1) & (int)(~(powerOf2 - 1));
729 }
730
731
732 DE_END_EXTERN_C
733
734 #endif /* _DEINT32_H */
735