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adjust heuristic decisions

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This commit is contained in:
Yann Collet 2018-09-12 12:32:09 -07:00
parent c49ccbc8e7
commit 5fb5ed3b31
1 changed files with 2 additions and 3 deletions
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5
lib/decompress/zstd_decompress.c
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@ -612,7 +612,7 @@ size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); if (litCSize + lhSize > srcSize) return ERROR(corruption_detected);
/* prefetch huffman table if cold */ /* prefetch huffman table if cold */
if (dctx->ddictIsCold && (litSize > 256 /* heuristic */)) { if (dctx->ddictIsCold && (litSize > 768 /* heuristic */)) {
PREFETCH_AREA(dctx->HUFptr, sizeof(dctx->entropy.hufTable)); PREFETCH_AREA(dctx->HUFptr, sizeof(dctx->entropy.hufTable));
} }
@ -917,8 +917,7 @@ static size_t ZSTD_buildSeqTable(ZSTD_seqSymbol* DTableSpace, const ZSTD_seqSymb
case set_repeat: case set_repeat:
if (!flagRepeatTable) return ERROR(corruption_detected); if (!flagRepeatTable) return ERROR(corruption_detected);
/* prefetch FSE table if used */ /* prefetch FSE table if used */
if (ddictIsCold && (nbSeq > 16 /* heuristic */)) { if (ddictIsCold && (nbSeq > 24 /* heuristic */)) {
//if (ddictIsCold) {
const void* const pStart = *DTablePtr; const void* const pStart = *DTablePtr;
size_t const pSize = sizeof(ZSTD_seqSymbol) * (SEQSYMBOL_TABLE_SIZE(maxLog)); size_t const pSize = sizeof(ZSTD_seqSymbol) * (SEQSYMBOL_TABLE_SIZE(maxLog));
PREFETCH_AREA(pStart, pSize); PREFETCH_AREA(pStart, pSize);