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hash: jhash optimisation

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Signed-off-by: Intel
This commit is contained in:
Intel 2013-06-03 00:00:00 +00:00 committed by Thomas Monjalon
parent 1a9f648be2
commit cbecb72292
1 changed files with 7 additions and 9 deletions
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16
lib/librte_hash/rte_jhash.h
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@ -97,24 +97,22 @@ static inline uint32_t
rte_jhash(const void *key, uint32_t length, uint32_t initval)
{
uint32_t a, b, c, len;
const uint8_t *k = (const uint8_t *) key;
const uint8_t *k = (const uint8_t *)key;
const uint32_t *k32 = (const uint32_t *)key;
len = length;
a = b = RTE_JHASH_GOLDEN_RATIO;
c = initval;
while (len >= 12) {
a += (k[0] + ((uint32_t)k[1] << 8) + ((uint32_t)k[2] << 16) +
((uint32_t)k[3] << 24));
b += (k[4] + ((uint32_t)k[5] << 8) + ((uint32_t)k[6] << 16) +
((uint32_t)k[7] << 24));
c += (k[8] + ((uint32_t)k[9] << 8) + ((uint32_t)k[10] << 16) +
((uint32_t)k[11] << 24));
a += k32[0];
b += k32[1];
c += k32[2];
__rte_jhash_mix(a,b,c);
k += 12;
len -= 12;
k += (3 * sizeof(uint32_t)), k32 += 3;
len -= (3 * sizeof(uint32_t));
}
c += length;