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improved lz4opt speed (~4%)

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This commit is contained in:
Yann Collet 2017-03-17 16:53:35 -07:00
parent eff6166eb8
commit 118b47f3d1
1 changed files with 12 additions and 12 deletions
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18
lib/lz4opt.h
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@ -65,8 +65,8 @@ FORCE_INLINE size_t LZ4HC_sequencePrice(size_t litlen, size_t mlen)
price += LZ4HC_literalsPrice(litlen);
mlen -= MINMATCH;
if (mlen >= (size_t)ML_MASK) price+= 1+(mlen-ML_MASK)/255;
if (mlen >= (size_t)(ML_MASK+MINMATCH))
price+= 1+(mlen-(ML_MASK+MINMATCH))/255;
return price;
}
@ -190,12 +190,12 @@ FORCE_INLINE int LZ4HC_BinTree_GetAllMatches (
}
#define SET_PRICE(pos, mlen, offset, litlen, price) \
#define SET_PRICE(pos, mlen, offset, ll, price) \
{ \
while (last_pos < pos) { opt[last_pos+1].price = 1<<30; last_pos++; } \
opt[pos].mlen = (int)mlen; \
opt[pos].off = (int)offset; \
opt[pos].litlen = (int)litlen; \
opt[pos].litlen = (int)ll; \
opt[pos].price = (int)price; \
}
@ -207,7 +207,7 @@ static int LZ4HC_compress_optimal (
int inputSize,
int maxOutputSize,
limitedOutput_directive limit,
const size_t sufficient_len,
size_t sufficient_len,
const int fullUpdate
)
{
@ -226,6 +226,7 @@ static int LZ4HC_compress_optimal (
BYTE* const oend = op + maxOutputSize;
/* init */
if (sufficient_len >= LZ4_OPT_NUM) sufficient_len = LZ4_OPT_NUM-1;
ctx->end += inputSize;
ip++;
@ -248,11 +249,10 @@ static int LZ4HC_compress_optimal (
/* set prices using matches at position = 0 */
for (i = 0; i < match_num; i++) {
mlen = (i>0) ? (size_t)matches[i-1].len+1 : MINMATCH;
best_mlen = (matches[i].len < LZ4_OPT_NUM) ? matches[i].len : LZ4_OPT_NUM;
best_mlen = matches[i].len; /* necessarily < LZ4_OPT_NUM */
while (mlen <= best_mlen) {
litlen = 0;
price = LZ4HC_sequencePrice(llen + litlen, mlen) - LZ4HC_literalsPrice(llen);
SET_PRICE(mlen, mlen, matches[i].off, litlen, price);
price = LZ4HC_sequencePrice(llen, mlen) - LZ4HC_literalsPrice(llen);
SET_PRICE(mlen, mlen, matches[i].off, 0, price); /* updates last_pos and opt[pos] */
mlen++;
}
}