aboutsummaryrefslogtreecommitdiff
path: root/stdlib/stdbit.h
blob: 2801590c63006ad2e6511dfb635423e88e510ca1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
/* ISO C23 Standard: 7.18 - Bit and byte utilities <stdbit.h>.
   Copyright (C) 2024 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _STDBIT_H
#define _STDBIT_H	1

#include <features.h>
#include <bits/endian.h>
#include <bits/stdint-intn.h>
#include <bits/stdint-uintn.h>
#include <bits/stdint-least.h>
/* In C23, <stdbool.h> defines only an implementation-namespace macro,
   so is OK to include here.  Before C23, including <stdbool.h> allows
   the header to use bool rather than _Bool unconditionally, and so to
   compile as C++ (although the type-generic macros are not a good
   form of type-generic interface for C++).  */
#include <stdbool.h>
#define __need_size_t
#include <stddef.h>

#define __STDC_VERSION_STDBIT_H__	202311L

#define __STDC_ENDIAN_LITTLE__		__LITTLE_ENDIAN
#define __STDC_ENDIAN_BIG__		__BIG_ENDIAN
#define __STDC_ENDIAN_NATIVE__		__BYTE_ORDER

__BEGIN_DECLS

/* Use __pacify_uint16 (N) instead of (uint16_t) (N) when the cast is helpful
   only to pacify older GCC (e.g., GCC 10 -Wconversion) or non-GCC (e.g
   clang -Wimplicit-int-conversion).  */
#if __GNUC_PREREQ (11, 0)
# define __pacify_uint8(n)  (n)
# define __pacify_uint16(n) (n)
#else
# define __pacify_uint8(n)  ((uint8_t) (n))
# define __pacify_uint16(n) ((uint16_t) (n))
#endif

/* Count leading zeros.  */
extern unsigned int stdc_leading_zeros_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_leading_zeros_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_leading_zeros_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_leading_zeros_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_leading_zeros_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_leading_zeros)
# define stdc_leading_zeros(x) (__builtin_stdc_leading_zeros (x))
#else
# define stdc_leading_zeros(x)				\
  (stdc_leading_zeros_ull (x)				\
   - (unsigned int) (8 * (sizeof (0ULL) - sizeof (x))))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline unsigned int
__clz64_inline (uint64_t __x)
{
  return __x == 0 ? 64U : (unsigned int) __builtin_clzll (__x);
}

static __always_inline unsigned int
__clz32_inline (uint32_t __x)
{
  return __x == 0 ? 32U : (unsigned int) __builtin_clz (__x);
}

static __always_inline unsigned int
__clz16_inline (uint16_t __x)
{
  return __clz32_inline (__x) - 16;
}

static __always_inline unsigned int
__clz8_inline (uint8_t __x)
{
  return __clz32_inline (__x) - 24;
}

# define stdc_leading_zeros_uc(x) (__clz8_inline (x))
# define stdc_leading_zeros_us(x) (__clz16_inline (x))
# define stdc_leading_zeros_ui(x) (__clz32_inline (x))
# if __WORDSIZE == 64
#  define stdc_leading_zeros_ul(x) (__clz64_inline (x))
# else
#  define stdc_leading_zeros_ul(x) (__clz32_inline (x))
# endif
# define stdc_leading_zeros_ull(x) (__clz64_inline (x))
#endif

/* Count leading ones.  */
extern unsigned int stdc_leading_ones_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_leading_ones_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_leading_ones_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_leading_ones_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_leading_ones_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_leading_ones)
# define stdc_leading_ones(x) (__builtin_stdc_leading_ones (x))
#else
# define stdc_leading_ones(x)					\
  (stdc_leading_ones_ull ((unsigned long long int) (x)		\
			  << 8 * (sizeof (0ULL) - sizeof (x))))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline unsigned int
__clo64_inline (uint64_t __x)
{
  return __clz64_inline (~__x);
}

static __always_inline unsigned int
__clo32_inline (uint32_t __x)
{
  return __clz32_inline (~__x);
}

static __always_inline unsigned int
__clo16_inline (uint16_t __x)
{
  return __clz16_inline (__pacify_uint16 (~__x));
}

static __always_inline unsigned int
__clo8_inline (uint8_t __x)
{
  return __clz8_inline (__pacify_uint8 (~__x));
}

# define stdc_leading_ones_uc(x) (__clo8_inline (x))
# define stdc_leading_ones_us(x) (__clo16_inline (x))
# define stdc_leading_ones_ui(x) (__clo32_inline (x))
# if __WORDSIZE == 64
#  define stdc_leading_ones_ul(x) (__clo64_inline (x))
# else
#  define stdc_leading_ones_ul(x) (__clo32_inline (x))
# endif
# define stdc_leading_ones_ull(x) (__clo64_inline (x))
#endif

/* Count trailing zeros.  */
extern unsigned int stdc_trailing_zeros_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_trailing_zeros_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_trailing_zeros_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_trailing_zeros_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_trailing_zeros_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_trailing_zeros)
# define stdc_trailing_zeros(x) (__builtin_stdc_trailing_zeros (x))
#else
# define stdc_trailing_zeros(x)				\
  (sizeof (x) == 8 ? stdc_trailing_zeros_ull (x)	\
   : sizeof (x) == 4 ? stdc_trailing_zeros_ui (x)	\
   : sizeof (x) == 2 ? stdc_trailing_zeros_us (__pacify_uint16 (x))	\
   : stdc_trailing_zeros_uc (__pacify_uint8 (x)))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_ctzll)
static __always_inline unsigned int
__ctz64_inline (uint64_t __x)
{
  return __x == 0 ? 64U : (unsigned int) __builtin_ctzll (__x);
}

static __always_inline unsigned int
__ctz32_inline (uint32_t __x)
{
  return __x == 0 ? 32U : (unsigned int) __builtin_ctz (__x);
}

static __always_inline unsigned int
__ctz16_inline (uint16_t __x)
{
  return __x == 0 ? 16U : (unsigned int) __builtin_ctz (__x);
}

static __always_inline unsigned int
__ctz8_inline (uint8_t __x)
{
  return __x == 0 ? 8U : (unsigned int) __builtin_ctz (__x);
}

# define stdc_trailing_zeros_uc(x) (__ctz8_inline (x))
# define stdc_trailing_zeros_us(x) (__ctz16_inline (x))
# define stdc_trailing_zeros_ui(x) (__ctz32_inline (x))
# if __WORDSIZE == 64
#  define stdc_trailing_zeros_ul(x) (__ctz64_inline (x))
# else
#  define stdc_trailing_zeros_ul(x) (__ctz32_inline (x))
# endif
# define stdc_trailing_zeros_ull(x) (__ctz64_inline (x))
#endif

/* Count trailing ones.  */
extern unsigned int stdc_trailing_ones_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_trailing_ones_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_trailing_ones_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_trailing_ones_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_trailing_ones_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_trailing_ones)
# define stdc_trailing_ones(x) (__builtin_stdc_trailing_ones (x))
#else
# define stdc_trailing_ones(x) (stdc_trailing_ones_ull (x))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_ctzll)
static __always_inline unsigned int
__cto64_inline (uint64_t __x)
{
  return __ctz64_inline (~__x);
}

static __always_inline unsigned int
__cto32_inline (uint32_t __x)
{
  return __ctz32_inline (~__x);
}

static __always_inline unsigned int
__cto16_inline (uint16_t __x)
{
  return __ctz16_inline (__pacify_uint16 (~__x));
}

static __always_inline unsigned int
__cto8_inline (uint8_t __x)
{
  return __ctz8_inline (__pacify_uint8 (~__x));
}

# define stdc_trailing_ones_uc(x) (__cto8_inline (x))
# define stdc_trailing_ones_us(x) (__cto16_inline (x))
# define stdc_trailing_ones_ui(x) (__cto32_inline (x))
# if __WORDSIZE == 64
#  define stdc_trailing_ones_ul(x) (__cto64_inline (x))
# else
#  define stdc_trailing_ones_ul(x) (__cto32_inline (x))
# endif
# define stdc_trailing_ones_ull(x) (__cto64_inline (x))
#endif

/* First leading zero.  */
extern unsigned int stdc_first_leading_zero_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_leading_zero_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_leading_zero_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_leading_zero_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_first_leading_zero_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_first_leading_zero)
# define stdc_first_leading_zero(x) (__builtin_stdc_first_leading_zero (x))
#else
# define stdc_first_leading_zero(x)			\
  (sizeof (x) == 8 ? stdc_first_leading_zero_ull (x)	\
   : sizeof (x) == 4 ? stdc_first_leading_zero_ui (x)	\
   : sizeof (x) == 2 ? stdc_first_leading_zero_us (__pacify_uint16 (x))	\
   : stdc_first_leading_zero_uc (__pacify_uint8 (x)))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline unsigned int
__flz64_inline (uint64_t __x)
{
  return __x == (uint64_t) -1 ? 0 : 1 + __clo64_inline (__x);
}

static __always_inline unsigned int
__flz32_inline (uint32_t __x)
{
  return __x == (uint32_t) -1 ? 0 : 1 + __clo32_inline (__x);
}

static __always_inline unsigned int
__flz16_inline (uint16_t __x)
{
  return __x == (uint16_t) -1 ? 0 : 1 + __clo16_inline (__x);
}

static __always_inline unsigned int
__flz8_inline (uint8_t __x)
{
  return __x == (uint8_t) -1 ? 0 : 1 + __clo8_inline (__x);
}

# define stdc_first_leading_zero_uc(x) (__flz8_inline (x))
# define stdc_first_leading_zero_us(x) (__flz16_inline (x))
# define stdc_first_leading_zero_ui(x) (__flz32_inline (x))
# if __WORDSIZE == 64
#  define stdc_first_leading_zero_ul(x) (__flz64_inline (x))
# else
#  define stdc_first_leading_zero_ul(x) (__flz32_inline (x))
# endif
# define stdc_first_leading_zero_ull(x) (__flz64_inline (x))
#endif

/* First leading one.  */
extern unsigned int stdc_first_leading_one_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_leading_one_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_leading_one_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_leading_one_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_first_leading_one_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_first_leading_one)
# define stdc_first_leading_one(x) (__builtin_stdc_first_leading_one (x))
#else
# define stdc_first_leading_one(x)			\
  (sizeof (x) == 8 ? stdc_first_leading_one_ull (x)	\
   : sizeof (x) == 4 ? stdc_first_leading_one_ui (x)	\
   : sizeof (x) == 2 ? stdc_first_leading_one_us (__pacify_uint16 (x))	\
   : stdc_first_leading_one_uc (__pacify_uint8 (x)))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline unsigned int
__flo64_inline (uint64_t __x)
{
  return __x == 0 ? 0 : 1 + __clz64_inline (__x);
}

static __always_inline unsigned int
__flo32_inline (uint32_t __x)
{
  return __x == 0 ? 0 : 1 + __clz32_inline (__x);
}

static __always_inline unsigned int
__flo16_inline (uint16_t __x)
{
  return __x == 0 ? 0 : 1 + __clz16_inline (__x);
}

static __always_inline unsigned int
__flo8_inline (uint8_t __x)
{
  return __x == 0 ? 0 : 1 + __clz8_inline (__x);
}

# define stdc_first_leading_one_uc(x) (__flo8_inline (x))
# define stdc_first_leading_one_us(x) (__flo16_inline (x))
# define stdc_first_leading_one_ui(x) (__flo32_inline (x))
# if __WORDSIZE == 64
#  define stdc_first_leading_one_ul(x) (__flo64_inline (x))
# else
#  define stdc_first_leading_one_ul(x) (__flo32_inline (x))
# endif
# define stdc_first_leading_one_ull(x) (__flo64_inline (x))
#endif

/* First trailing zero.  */
extern unsigned int stdc_first_trailing_zero_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_trailing_zero_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_trailing_zero_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_trailing_zero_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_first_trailing_zero_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_first_trailing_zero)
# define stdc_first_trailing_zero(x) (__builtin_stdc_first_trailing_zero (x))
#else
# define stdc_first_trailing_zero(x)			\
  (sizeof (x) == 8 ? stdc_first_trailing_zero_ull (x)	\
   : sizeof (x) == 4 ? stdc_first_trailing_zero_ui (x)	\
   : sizeof (x) == 2 ? stdc_first_trailing_zero_us (__pacify_uint16 (x)) \
   : stdc_first_trailing_zero_uc (__pacify_uint8 (x)))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_ctzll)
static __always_inline unsigned int
__ftz64_inline (uint64_t __x)
{
  return __x == (uint64_t) -1 ? 0 : 1 + __cto64_inline (__x);
}

static __always_inline unsigned int
__ftz32_inline (uint32_t __x)
{
  return __x == (uint32_t) -1 ? 0 : 1 + __cto32_inline (__x);
}

static __always_inline unsigned int
__ftz16_inline (uint16_t __x)
{
  return __x == (uint16_t) -1 ? 0 : 1 + __cto16_inline (__x);
}

static __always_inline unsigned int
__ftz8_inline (uint8_t __x)
{
  return __x == (uint8_t) -1 ? 0 : 1 + __cto8_inline (__x);
}

# define stdc_first_trailing_zero_uc(x) (__ftz8_inline (x))
# define stdc_first_trailing_zero_us(x) (__ftz16_inline (x))
# define stdc_first_trailing_zero_ui(x) (__ftz32_inline (x))
# if __WORDSIZE == 64
#  define stdc_first_trailing_zero_ul(x) (__ftz64_inline (x))
# else
#  define stdc_first_trailing_zero_ul(x) (__ftz32_inline (x))
# endif
# define stdc_first_trailing_zero_ull(x) (__ftz64_inline (x))
#endif

/* First trailing one.  */
extern unsigned int stdc_first_trailing_one_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_trailing_one_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_trailing_one_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_first_trailing_one_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_first_trailing_one_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_first_trailing_one)
# define stdc_first_trailing_one(x) (__builtin_stdc_first_trailing_one (x))
#else
# define stdc_first_trailing_one(x)			\
  (sizeof (x) == 8 ? stdc_first_trailing_one_ull (x)	\
   : sizeof (x) == 4 ? stdc_first_trailing_one_ui (x)	\
   : sizeof (x) == 2 ? stdc_first_trailing_one_us (__pacify_uint16 (x))	\
   : stdc_first_trailing_one_uc (__pacify_uint8 (x)))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_ctzll)
static __always_inline unsigned int
__fto64_inline (uint64_t __x)
{
  return __x == 0 ? 0 : 1 + __ctz64_inline (__x);
}

static __always_inline unsigned int
__fto32_inline (uint32_t __x)
{
  return __x == 0 ? 0 : 1 + __ctz32_inline (__x);
}

static __always_inline unsigned int
__fto16_inline (uint16_t __x)
{
  return __x == 0 ? 0 : 1 + __ctz16_inline (__x);
}

static __always_inline unsigned int
__fto8_inline (uint8_t __x)
{
  return __x == 0 ? 0 : 1 + __ctz8_inline (__x);
}

# define stdc_first_trailing_one_uc(x) (__fto8_inline (x))
# define stdc_first_trailing_one_us(x) (__fto16_inline (x))
# define stdc_first_trailing_one_ui(x) (__fto32_inline (x))
# if __WORDSIZE == 64
#  define stdc_first_trailing_one_ul(x) (__fto64_inline (x))
# else
#  define stdc_first_trailing_one_ul(x) (__fto32_inline (x))
# endif
# define stdc_first_trailing_one_ull(x) (__fto64_inline (x))
#endif

/* Count zeros.  */
extern unsigned int stdc_count_zeros_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_count_zeros_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_count_zeros_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_count_zeros_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_count_zeros_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_count_zeros)
# define stdc_count_zeros(x) (__builtin_stdc_count_zeros (x))
#else
# define stdc_count_zeros(x)				\
  (stdc_count_zeros_ull (x)				\
   - (unsigned int) (8 * (sizeof (0ULL) - sizeof (x))))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_popcountll)
static __always_inline unsigned int
__cz64_inline (uint64_t __x)
{
  return 64U - (unsigned int) __builtin_popcountll (__x);
}

static __always_inline unsigned int
__cz32_inline (uint32_t __x)
{
  return 32U - (unsigned int) __builtin_popcount (__x);
}

static __always_inline unsigned int
__cz16_inline (uint16_t __x)
{
  return 16U - (unsigned int) __builtin_popcount (__x);
}

static __always_inline unsigned int
__cz8_inline (uint8_t __x)
{
  return 8U - (unsigned int) __builtin_popcount (__x);
}

# define stdc_count_zeros_uc(x) (__cz8_inline (x))
# define stdc_count_zeros_us(x) (__cz16_inline (x))
# define stdc_count_zeros_ui(x) (__cz32_inline (x))
# if __WORDSIZE == 64
#  define stdc_count_zeros_ul(x) (__cz64_inline (x))
# else
#  define stdc_count_zeros_ul(x) (__cz32_inline (x))
# endif
# define stdc_count_zeros_ull(x) (__cz64_inline (x))
#endif

/* Count ones.  */
extern unsigned int stdc_count_ones_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_count_ones_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_count_ones_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_count_ones_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_count_ones_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_count_ones)
# define stdc_count_ones(x) (__builtin_stdc_count_ones (x))
#else
# define stdc_count_ones(x) (stdc_count_ones_ull (x))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_popcountll)
static __always_inline unsigned int
__co64_inline (uint64_t __x)
{
  return (unsigned int) __builtin_popcountll (__x);
}

static __always_inline unsigned int
__co32_inline (uint32_t __x)
{
  return (unsigned int) __builtin_popcount (__x);
}

static __always_inline unsigned int
__co16_inline (uint16_t __x)
{
  return (unsigned int) __builtin_popcount (__x);
}

static __always_inline unsigned int
__co8_inline (uint8_t __x)
{
  return (unsigned int) __builtin_popcount (__x);
}

# define stdc_count_ones_uc(x) (__co8_inline (x))
# define stdc_count_ones_us(x) (__co16_inline (x))
# define stdc_count_ones_ui(x) (__co32_inline (x))
# if __WORDSIZE == 64
#  define stdc_count_ones_ul(x) (__co64_inline (x))
# else
#  define stdc_count_ones_ul(x) (__co32_inline (x))
# endif
# define stdc_count_ones_ull(x) (__co64_inline (x))
#endif

/* Single-bit check.  */
extern bool stdc_has_single_bit_uc (unsigned char __x)
     __THROW __attribute_const__;
extern bool stdc_has_single_bit_us (unsigned short __x)
     __THROW __attribute_const__;
extern bool stdc_has_single_bit_ui (unsigned int __x)
     __THROW __attribute_const__;
extern bool stdc_has_single_bit_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern bool stdc_has_single_bit_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_has_single_bit)
# define stdc_has_single_bit(x) (__builtin_stdc_has_single_bit (x))
#else
# define stdc_has_single_bit(x)				\
  ((bool) (sizeof (x) <= sizeof (unsigned int)		\
	   ? stdc_has_single_bit_ui (x)			\
	   : stdc_has_single_bit_ull (x)))
#endif

static __always_inline bool
__hsb64_inline (uint64_t __x)
{
  return (__x ^ (__x - 1)) > __x - 1;
}

static __always_inline bool
__hsb32_inline (uint32_t __x)
{
  return (__x ^ (__x - 1)) > __x - 1;
}

static __always_inline bool
__hsb16_inline (uint16_t __x)
{
  return (__x ^ (__x - 1)) > __x - 1;
}

static __always_inline bool
__hsb8_inline (uint8_t __x)
{
  return (__x ^ (__x - 1)) > __x - 1;
}

#define stdc_has_single_bit_uc(x) (__hsb8_inline (x))
#define stdc_has_single_bit_us(x) (__hsb16_inline (x))
#define stdc_has_single_bit_ui(x) (__hsb32_inline (x))
#if __WORDSIZE == 64
# define stdc_has_single_bit_ul(x) (__hsb64_inline (x))
#else
# define stdc_has_single_bit_ul(x) (__hsb32_inline (x))
#endif
#define stdc_has_single_bit_ull(x) (__hsb64_inline (x))

/* Bit width.  */
extern unsigned int stdc_bit_width_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned int stdc_bit_width_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_bit_width_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned int stdc_bit_width_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned int stdc_bit_width_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_bit_width)
# define stdc_bit_width(x) (__builtin_stdc_bit_width (x))
#else
# define stdc_bit_width(x) (stdc_bit_width_ull (x))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline unsigned int
__bw64_inline (uint64_t __x)
{
  return 64 - __clz64_inline (__x);
}

static __always_inline unsigned int
__bw32_inline (uint32_t __x)
{
  return 32 - __clz32_inline (__x);
}

static __always_inline unsigned int
__bw16_inline (uint16_t __x)
{
  return 16 - __clz16_inline (__x);
}

static __always_inline unsigned int
__bw8_inline (uint8_t __x)
{
  return 8 - __clz8_inline (__x);
}

# define stdc_bit_width_uc(x) (__bw8_inline (x))
# define stdc_bit_width_us(x) (__bw16_inline (x))
# define stdc_bit_width_ui(x) (__bw32_inline (x))
# if __WORDSIZE == 64
#  define stdc_bit_width_ul(x) (__bw64_inline (x))
# else
#  define stdc_bit_width_ul(x) (__bw32_inline (x))
# endif
# define stdc_bit_width_ull(x) (__bw64_inline (x))
#endif

/* Bit floor.  */
extern unsigned char stdc_bit_floor_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned short stdc_bit_floor_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_bit_floor_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned long int stdc_bit_floor_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned long long int stdc_bit_floor_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_bit_floor)
# define stdc_bit_floor(x) (__builtin_stdc_bit_floor (x))
#else
# define stdc_bit_floor(x) ((__typeof (x)) stdc_bit_floor_ull (x))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline uint64_t
__bf64_inline (uint64_t __x)
{
  return __x == 0 ? 0 : ((uint64_t) 1) << (__bw64_inline (__x) - 1);
}

static __always_inline uint32_t
__bf32_inline (uint32_t __x)
{
  return __x == 0 ? 0 : ((uint32_t) 1) << (__bw32_inline (__x) - 1);
}

static __always_inline uint16_t
__bf16_inline (uint16_t __x)
{
  return __pacify_uint16 (__x == 0
			  ? 0 : ((uint16_t) 1) << (__bw16_inline (__x) - 1));
}

static __always_inline uint8_t
__bf8_inline (uint8_t __x)
{
  return __pacify_uint8 (__x == 0
			 ? 0 : ((uint8_t) 1) << (__bw8_inline (__x) - 1));
}

# define stdc_bit_floor_uc(x) ((unsigned char) __bf8_inline (x))
# define stdc_bit_floor_us(x) ((unsigned short) __bf16_inline (x))
# define stdc_bit_floor_ui(x) ((unsigned int) __bf32_inline (x))
# if __WORDSIZE == 64
#  define stdc_bit_floor_ul(x) ((unsigned long int) __bf64_inline (x))
# else
#  define stdc_bit_floor_ul(x) ((unsigned long int) __bf32_inline (x))
# endif
# define stdc_bit_floor_ull(x) ((unsigned long long int) __bf64_inline (x))
#endif

/* Bit ceiling.  */
extern unsigned char stdc_bit_ceil_uc (unsigned char __x)
     __THROW __attribute_const__;
extern unsigned short stdc_bit_ceil_us (unsigned short __x)
     __THROW __attribute_const__;
extern unsigned int stdc_bit_ceil_ui (unsigned int __x)
     __THROW __attribute_const__;
extern unsigned long int stdc_bit_ceil_ul (unsigned long int __x)
     __THROW __attribute_const__;
__extension__
extern unsigned long long int stdc_bit_ceil_ull (unsigned long long int __x)
     __THROW __attribute_const__;
#if __glibc_has_builtin (__builtin_stdc_bit_ceil)
# define stdc_bit_ceil(x) (__builtin_stdc_bit_ceil (x))
#else
# define stdc_bit_ceil(x) ((__typeof (x)) stdc_bit_ceil_ull (x))
#endif

#if __GNUC_PREREQ (3, 4) || __glibc_has_builtin (__builtin_clzll)
static __always_inline uint64_t
__bc64_inline (uint64_t __x)
{
  return __x <= 1 ? 1 : ((uint64_t) 2) << (__bw64_inline (__x - 1) - 1);
}

static __always_inline uint32_t
__bc32_inline (uint32_t __x)
{
  return __x <= 1 ? 1 : ((uint32_t) 2) << (__bw32_inline (__x - 1) - 1);
}

static __always_inline uint16_t
__bc16_inline (uint16_t __x)
{
  return __pacify_uint16 (__x <= 1
			  ? 1
			  : ((uint16_t) 2)
			    << (__bw16_inline ((uint16_t) (__x - 1)) - 1));
}

static __always_inline uint8_t
__bc8_inline (uint8_t __x)
{
  return __pacify_uint8 (__x <= 1
			 ? 1
			 : ((uint8_t) 2)
			   << (__bw8_inline ((uint8_t) (__x - 1)) - 1));
}

# define stdc_bit_ceil_uc(x) ((unsigned char) __bc8_inline (x))
# define stdc_bit_ceil_us(x) ((unsigned short) __bc16_inline (x))
# define stdc_bit_ceil_ui(x) ((unsigned int) __bc32_inline (x))
# if __WORDSIZE == 64
#  define stdc_bit_ceil_ul(x) ((unsigned long int) __bc64_inline (x))
# else
#  define stdc_bit_ceil_ul(x) ((unsigned long int) __bc32_inline (x))
# endif
# define stdc_bit_ceil_ull(x) ((unsigned long long int) __bc64_inline (x))
#endif

__END_DECLS

#endif /* _STDBIT_H */