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HLL_(SET|GET)_REGISTER types fixed.

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antirez 2014-03-28 12:15:39 +01:00
parent 552eb5407a
commit 1c88c5941b
1 changed files with 9 additions and 7 deletions
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16
src/hyperloglog.c
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@ -149,25 +149,27 @@
/* Store the value of the register at position 'regnum' into variable 'target'.
* 'p' is an array of unsigned bytes. */
#define HLL_GET_REGISTER(target,p,regnum) do { \
uint8_t *_p = (uint8_t*) p; \
int _byte = regnum*REDIS_HLL_BITS/8; \
int _leftshift = regnum*REDIS_HLL_BITS&7; \
int _rightshift = 8 - _leftshift; \
target = ((p[_byte] << _leftshift) | \
(p[_byte+1] >> _rightshift)) & \
target = ((_p[_byte] << _leftshift) | \
(_p[_byte+1] >> _rightshift)) & \
((1<<REDIS_HLL_BITS)-1); \
} while(0)
/* Set the value of the register at position 'regnum' to 'val'.
* 'p' is an array of unsigned bytes. */
#define HLL_SET_REGISTER(p,regnum,val) do { \
uint8_t *_p = (uint8_t*) p; \
int _byte = regnum*REDIS_HLL_BITS/8; \
int _leftshift = regnum*REDIS_HLL_BITS&7; \
int _rightshift = 8 - _leftshift; \
unsigned int m1 = 255, m2 = REDIS_HLL_REGISTER_MAX; \
p[_byte] &= m1 << _rightshift; \
p[_byte] |= val >> _leftshift; \
p[_byte+1] &= ~(m2 << _rightshift); \
p[_byte+1] |= val << _rightshift; \
uint8_t m1 = 255, m2 = REDIS_HLL_REGISTER_MAX; \
_p[_byte] &= m1 << _rightshift; \
_p[_byte] |= val >> _leftshift; \
_p[_byte+1] &= ~(m2 << _rightshift); \
_p[_byte+1] |= val << _rightshift; \
} while(0)
/* ========================= HyperLogLog algorithm ========================= */