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added LOG2_CEIL

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This commit is contained in:
Steffen Vogel 2016-10-22 20:44:18 -04:00
parent f82fc64990
commit d5c844f18d
1 changed files with 12 additions and 1 deletions
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13
include/villas/utils.h
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@ -55,7 +55,11 @@
#define ALIGN_MASK(x, m) (((uintptr_t) (x) + (m)) & ~(m))
#define IS_ALIGNED(x, a) (ALIGN(x, a) == (uintptr_t) x)
#define CEIL(x, y) ((x + y - 1) / y)
/** Round-up integer division */
#define CEIL(x, y) (((x) + (y) - 1) / (y))
/** Get nearest up-rounded power of 2 */
#define LOG2_CEIL(x) (1 << log2i((x) - 1) + 1)
/** Calculate the number of elements in an array. */
#define ARRAY_LEN(a) ( sizeof (a) / sizeof (a)[0] )
@ -212,6 +216,13 @@ __attribute__((always_inline)) static inline uint64_t rdtsc()
return tsc;
}
/** Get log2 of long long integers */
static inline int log2i(long long x) {
assert(x > 0);
return sizeof(x) * 8 - __builtin_clzll(x) - 1;
}
/** Sleep with rdtsc */
void rdtsc_sleep(uint64_t nanosecs, uint64_t start);