1#ifndef _ATOMIC_H
2#define _ATOMIC_H
3
4#include <stdint.h>
5
6#include "atomic_arch.h"
7
8#ifndef a_crash
9#define a_crash a_crash
10static inline void a_crash()
11{
12	*(volatile char *)0=0;
13}
14#endif
15
16#ifndef a_ctz_32
17#define a_ctz_32 a_ctz_32
18static inline int a_ctz_32(uint32_t x)
19{
20#ifdef a_clz_32
21	return 31-a_clz_32(x&-x);
22#else
23	static const char debruijn32[32] = {
24		0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
25		31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
26	};
27	return debruijn32[(x&-x)*0x076be629 >> 27];
28#endif
29}
30#endif
31
32#ifndef a_ctz_64
33#define a_ctz_64 a_ctz_64
34static inline int a_ctz_64(uint64_t x)
35{
36	static const char debruijn64[64] = {
37		0, 1, 2, 53, 3, 7, 54, 27, 4, 38, 41, 8, 34, 55, 48, 28,
38		62, 5, 39, 46, 44, 42, 22, 9, 24, 35, 59, 56, 49, 18, 29, 11,
39		63, 52, 6, 26, 37, 40, 33, 47, 61, 45, 43, 21, 23, 58, 17, 10,
40		51, 25, 36, 32, 60, 20, 57, 16, 50, 31, 19, 15, 30, 14, 13, 12
41	};
42	if (sizeof(long) < 8) {
43		uint32_t y = x;
44		if (!y) {
45			y = x>>32;
46			return 32 + a_ctz_32(y);
47		}
48		return a_ctz_32(y);
49	}
50	return debruijn64[(x&-x)*0x022fdd63cc95386dull >> 58];
51}
52#endif
53
54static inline int a_ctz_l(unsigned long x)
55{
56	return (sizeof(long) < 8) ? a_ctz_32(x) : a_ctz_64(x);
57}
58
59#ifndef a_clz_64
60#define a_clz_64 a_clz_64
61static inline int a_clz_64(uint64_t x)
62{
63#ifdef a_clz_32
64	if (x>>32)
65		return a_clz_32(x>>32);
66	return a_clz_32(x) + 32;
67#else
68	uint32_t y;
69	int r;
70	if (x>>32) y=x>>32, r=0; else y=x, r=32;
71	if (y>>16) y>>=16; else r |= 16;
72	if (y>>8) y>>=8; else r |= 8;
73	if (y>>4) y>>=4; else r |= 4;
74	if (y>>2) y>>=2; else r |= 2;
75	return r | !(y>>1);
76#endif
77}
78#endif
79
80#ifndef a_clz_32
81#define a_clz_32 a_clz_32
82static inline int a_clz_32(uint32_t x)
83{
84	x >>= 1;
85	x |= x >> 1;
86	x |= x >> 2;
87	x |= x >> 4;
88	x |= x >> 8;
89	x |= x >> 16;
90	x++;
91	return 31-a_ctz_32(x);
92}
93#endif
94
95#endif
96