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Merge pull request #418 from lz4/fasterCount

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faster LZ4_count()
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Yann Collet 2017-11-07 12:09:32 -08:00 committed by GitHub
commit e6365b1854
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1 changed files with 11 additions and 2 deletions
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13
lib/lz4.c
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@ -403,11 +403,20 @@ static unsigned LZ4_NbCommonBytes (REGISTER reg_t val)
}
#define STEPSIZE sizeof(reg_t)
static unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
LZ4_FORCE_INLINE
unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
{
const BYTE* const pStart = pIn;
while (likely(pIn<pInLimit-(STEPSIZE-1))) {
if (likely(pIn < pInLimit-(STEPSIZE-1))) {
reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
if (!diff) {
pIn+=STEPSIZE; pMatch+=STEPSIZE;
} else {
return LZ4_NbCommonBytes(diff);
} }
while (likely(pIn < pInLimit-(STEPSIZE-1))) {
reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
if (!diff) { pIn+=STEPSIZE; pMatch+=STEPSIZE; continue; }
pIn += LZ4_NbCommonBytes(diff);