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small compression speed gains with using_CDict

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This commit is contained in:
Yann Collet 2016-09-06 06:28:05 +02:00
parent 1d4208c029
commit 7ae67bb18a
2 changed files with 14 additions and 11 deletions
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16
lib/compress/zstd_compress.c
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@ -142,8 +142,7 @@ const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) /* hidden interface *
}
#define CLAMP(val,min,max) { if (val<min) val=min; else if (val>max) val=max; }
#define CLAMPCHECK(val,min,max) { if ((val<min) || (val>max)) return ERROR(compressionParameter_unsupported); }
#define CLAMPCHECK(val,min,max) { if ((val<min) | (val>max)) return ERROR(compressionParameter_unsupported); }
/** ZSTD_checkParams() :
ensure param values remain within authorized range.
@ -171,7 +170,7 @@ size_t ZSTD_checkCParams_advanced(ZSTD_compressionParameters cParams, U64 srcSiz
if (cParams.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) return ERROR(compressionParameter_unsupported);
if (srcSize <= (1ULL << cParams.windowLog)) cParams.windowLog = ZSTD_WINDOWLOG_MIN; /* fake value - temporary work around */
if (srcSize <= (1ULL << cParams.chainLog)) cParams.chainLog = ZSTD_CHAINLOG_MIN; /* fake value - temporary work around */
if ((srcSize <= (1ULL << cParams.hashLog)) && ((U32)cParams.strategy < (U32)ZSTD_btlazy2)) cParams.hashLog = ZSTD_HASHLOG_MIN; /* fake value - temporary work around */
if ((srcSize <= (1ULL << cParams.hashLog)) & ((U32)cParams.strategy < (U32)ZSTD_btlazy2)) cParams.hashLog = ZSTD_HASHLOG_MIN; /* fake value - temporary work around */
return ZSTD_checkCParams(cParams);
}
@ -194,12 +193,12 @@ ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, u
if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
} }
if (cPar.hashLog > cPar.windowLog) cPar.hashLog = cPar.windowLog;
{ U32 const btPlus = (cPar.strategy == ZSTD_btlazy2) || (cPar.strategy == ZSTD_btopt);
{ U32 const btPlus = (cPar.strategy == ZSTD_btlazy2) | (cPar.strategy == ZSTD_btopt);
U32 const maxChainLog = cPar.windowLog+btPlus;
if (cPar.chainLog > maxChainLog) cPar.chainLog = maxChainLog; } /* <= ZSTD_CHAINLOG_MAX */
if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
if ((cPar.hashLog < ZSTD_HASHLOG_MIN) && ( (U32)cPar.strategy >= (U32)ZSTD_btlazy2)) cPar.hashLog = ZSTD_HASHLOG_MIN; /* required to ensure collision resistance in bt */
if ((cPar.hashLog < ZSTD_HASHLOG_MIN) & ((U32)cPar.strategy >= (U32)ZSTD_btlazy2)) cPar.hashLog = ZSTD_HASHLOG_MIN; /* required to ensure collision resistance in bt */
return cPar;
}
@ -255,7 +254,7 @@ static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
zc->workSpaceSize = neededSpace;
} }
if (reset) memset(zc->workSpace, 0, tableSpace ); /* reset only tables */
if (reset) memset(zc->workSpace, 0, tableSpace); /* reset tables only */
XXH64_reset(&zc->xxhState, 0);
zc->hashLog3 = hashLog3;
zc->hashTable = (U32*)(zc->workSpace);
@ -2737,8 +2736,13 @@ ZSTDLIB_API size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
const void* src, size_t srcSize,
const ZSTD_CDict* cdict)
{
if (cdict->dictContentSize) {
size_t const errorCode = ZSTD_copyCCtx(cctx, cdict->refContext);
if (ZSTD_isError(errorCode)) return errorCode;
} else {
size_t const errorCode = ZSTD_compressBegin_advanced(cctx, NULL, 0, cdict->refContext->params, srcSize);
if (ZSTD_isError(errorCode)) return errorCode;
}
if (cdict->refContext->params.fParams.contentSizeFlag==1) {
cctx->params.fParams.contentSizeFlag = 1;

1
programs/bench.c
View File

@ -24,7 +24,6 @@
#include "xxhash.h"
/* *************************************
* Constants
***************************************/