1 #ifndef __LUNAIX_SPIKE_H
2 #define __LUNAIX_SPIKE_H
4 #include <lunaix/compiler.h>
6 /** Some helper functions. As helpful as Spike the Dragon! :) **/
9 #define CEIL(v, k) (((v) + (1 << (k)) - 1) >> (k))
11 #define ICEIL(x, y) ((x) / (y) + ((x) % (y) != 0))
14 #define FLOOR(v, k) ((v) >> (k))
16 // 获取v最近的最大k倍数 (k=2^n)
17 #define ROUNDUP(v, k) (((v) + (k)-1) & ~((k)-1))
19 // 获取v最近的最小k倍数 (k=2^m)
20 #define ROUNDDOWN(v, k) ((v) & ~((k)-1))
22 #define MIN(a, b) ((a) < (b) ? (a) : (b))
23 #define MAX(a, b) ((a) > (b) ? (a) : (b))
26 * @brief Fast log base 2 for integer, utilizing constant unfolding.
28 * https://elixir.bootlin.com/linux/v4.4/source/include/linux/log2.h#L85
32 (__builtin_constant_p(x) ? ((x) == 0 ? 0 \
33 : ((x) & (1ul << 31)) ? 31 \
34 : ((x) & (1ul << 30)) ? 30 \
35 : ((x) & (1ul << 29)) ? 29 \
36 : ((x) & (1ul << 28)) ? 28 \
37 : ((x) & (1ul << 27)) ? 27 \
38 : ((x) & (1ul << 26)) ? 26 \
39 : ((x) & (1ul << 25)) ? 25 \
40 : ((x) & (1ul << 24)) ? 24 \
41 : ((x) & (1ul << 23)) ? 23 \
42 : ((x) & (1ul << 22)) ? 22 \
43 : ((x) & (1ul << 21)) ? 21 \
44 : ((x) & (1ul << 20)) ? 20 \
45 : ((x) & (1ul << 19)) ? 19 \
46 : ((x) & (1ul << 18)) ? 18 \
47 : ((x) & (1ul << 17)) ? 17 \
48 : ((x) & (1ul << 16)) ? 16 \
49 : ((x) & (1ul << 15)) ? 15 \
50 : ((x) & (1ul << 14)) ? 14 \
51 : ((x) & (1ul << 13)) ? 13 \
52 : ((x) & (1ul << 12)) ? 12 \
53 : ((x) & (1ul << 11)) ? 11 \
54 : ((x) & (1ul << 10)) ? 10 \
55 : ((x) & (1ul << 9)) ? 9 \
56 : ((x) & (1ul << 8)) ? 8 \
57 : ((x) & (1ul << 7)) ? 7 \
58 : ((x) & (1ul << 6)) ? 6 \
59 : ((x) & (1ul << 5)) ? 5 \
60 : ((x) & (1ul << 4)) ? 4 \
61 : ((x) & (1ul << 3)) ? 3 \
62 : ((x) & (1ul << 2)) ? 2 \
63 : ((x) & (1ul << 1)) ? 1 \
65 : (31 - __builtin_clz(x)))
77 #ifndef __LUNAIXOS_NASSERT__
78 #define assert(cond) \
80 __assert_fail(#cond, __FILE__, __LINE__); \
83 #define assert_msg(cond, msg) \
85 __assert_fail(msg, __FILE__, __LINE__); \
88 #define fail(msg) __assert_fail(msg, __FILE__, __LINE__);
91 __assert_fail(const char* expr, const char* file, unsigned int line)
92 __attribute__((noinline, noreturn));
94 #define assert(cond) (void)(cond); // assert nothing
95 #define assert_msg(cond, msg) (void)(cond); // assert nothing
97 #endif // __LUNAIXOS_NASSERT__
100 panick(const char* msg);
103 panickf(const char* fmt, ...);
105 #define wait_until(cond) \
108 #define loop_until(cond) \
112 #define wait_until_expire(cond, max) \
114 unsigned int __wcounter__ = (max); \
115 while (!(cond) && __wcounter__-- > 1) \
120 #endif /* __LUNAIX_SPIKE_H */