bird/lib/bitops.h
Ondrej Zajicek (work) 9b0a0ba9e6 Unit Testing for BIRD
- Unit Testing Framework (BirdTest)
 - Integration of BirdTest into the BIRD build system
 - Tests for several BIRD modules

 Based on squashed Pavel Tvrdik's int-test branch, updated for
 current int-new branch.
2016-11-09 16:36:34 +01:00

32 lines
714 B
C

/*
* BIRD Library -- Generic Bit Operations
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_BITOPTS_H_
#define _BIRD_BITOPTS_H_
#include "sysdep/config.h"
/*
* Bit mask operations:
*
* u32_mkmask Make bit mask consisting of <n> consecutive ones
* from the left and the rest filled with zeroes.
* E.g., u32_mkmask(5) = 0xf8000000.
* u32_masklen Inverse operation to u32_mkmask, -1 if not a bitmask.
*/
u32 u32_mkmask(uint n);
uint u32_masklen(u32 x);
u32 u32_log2(u32 v);
static inline u32 u32_hash(u32 v) { return v * 2902958171u; }
static inline u8 u32_popcount(u32 v) { return __builtin_popcount(v); }
#endif