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btopt: minor speed optimization

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matchPrice is always right at beginning
This commit is contained in:
Yann Collet
2017-11-27 17:01:51 -08:00
parent 743b23878e
commit e9d1987fd7
1 changed files with 4 additions and 7 deletions
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5
lib/compress/zstd_opt.c
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@@ -523,14 +523,11 @@ size_t ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
U32 const offset = matches[matchNb].off; U32 const offset = matches[matchNb].off;
U32 const end = matches[matchNb].len; U32 const end = matches[matchNb].len;
repcodes_t const repHistory = ZSTD_updateRep(rep, offset, ll0); repcodes_t const repHistory = ZSTD_updateRep(rep, offset, ll0);
while (pos <= end) { for ( ; pos <= end ; pos++) {
U32 const matchPrice = ZSTD_getPrice(optStatePtr, litlen, anchor, offset, pos, optLevel); U32 const matchPrice = ZSTD_getPrice(optStatePtr, litlen, anchor, offset, pos, optLevel);
if (pos > last_pos || matchPrice < opt[pos].price) {
DEBUGLOG(7, "rPos:%u => set initial price : %u", DEBUGLOG(7, "rPos:%u => set initial price : %u",
pos, matchPrice); pos, matchPrice);
SET_PRICE(pos, pos, offset, litlen, matchPrice, repHistory); /* note : macro modifies last_pos */ SET_PRICE(pos, pos, offset, litlen, matchPrice, repHistory); /* note : macro modifies last_pos */
}
pos++;
} } } } } }
} }