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slightly improved compression speed

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This commit is contained in:
Yann Collet 2016-07-30 00:55:13 +02:00
parent ed57d8530a
commit c0ce4f1211
4 changed files with 24 additions and 22 deletions
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2
lib/common/zstd_internal.h
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@ -192,13 +192,13 @@ typedef struct seqDef_s {
typedef struct {
seqDef* sequencesStart;
seqDef* sequences;
BYTE* litStart;
BYTE* lit;
BYTE* llCode;
BYTE* mlCode;
BYTE* ofCode;
U32 nbSeq;
U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
U32 longLengthPos;
/* opt */

27
lib/compress/zstd_compress.c
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@ -82,7 +82,7 @@ size_t ZSTD_compressBound(size_t srcSize) { return FSE_compressBound(srcSize) +
static void ZSTD_resetSeqStore(seqStore_t* ssPtr)
{
ssPtr->lit = ssPtr->litStart;
ssPtr->nbSeq = 0;
ssPtr->sequences = ssPtr->sequencesStart;
ssPtr->longLengthID = 0;
}
@ -312,8 +312,8 @@ static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
ptr = zc->seqStore.priceTable + ZSTD_OPT_NUM+1;
zc->seqStore.litLengthSum = 0;
}
zc->seqStore.sequences = (seqDef*)ptr;
ptr = zc->seqStore.sequences + maxNbSeq;
zc->seqStore.sequencesStart = (seqDef*)ptr;
ptr = zc->seqStore.sequencesStart + maxNbSeq;
zc->seqStore.llCode = (BYTE*) ptr;
zc->seqStore.mlCode = zc->seqStore.llCode + maxNbSeq;
zc->seqStore.ofCode = zc->seqStore.mlCode + maxNbSeq;
@ -545,11 +545,11 @@ void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
{
BYTE const LL_deltaCode = 19;
BYTE const ML_deltaCode = 36;
const seqDef* const sequences = seqStorePtr->sequences;
const seqDef* const sequences = seqStorePtr->sequencesStart;
BYTE* const llCodeTable = seqStorePtr->llCode;
BYTE* const ofCodeTable = seqStorePtr->ofCode;
BYTE* const mlCodeTable = seqStorePtr->mlCode;
U32 const nbSeq = seqStorePtr->nbSeq;
U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
U32 u;
for (u=0; u<nbSeq; u++) {
U32 const llv = sequences[u].litLength;
@ -576,14 +576,14 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
FSE_CTable* CTable_OffsetBits = zc->offcodeCTable;
FSE_CTable* CTable_MatchLength = zc->matchlengthCTable;
U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */
const seqDef* const sequences = seqStorePtr->sequences;
const seqDef* const sequences = seqStorePtr->sequencesStart;
const BYTE* const ofCodeTable = seqStorePtr->ofCode;
const BYTE* const llCodeTable = seqStorePtr->llCode;
const BYTE* const mlCodeTable = seqStorePtr->mlCode;
BYTE* const ostart = (BYTE*)dst;
BYTE* const oend = ostart + dstCapacity;
BYTE* op = ostart;
size_t const nbSeq = seqStorePtr->nbSeq;
size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
BYTE* seqHead;
/* Compress literals */
@ -765,7 +765,6 @@ MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const v
printf("Cpos %6u :%5u literals & match %3u bytes at distance %6u \n",
pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode);
#endif
U32 const nbSeq = seqStorePtr->nbSeq;
ZSTD_statsUpdatePrices(&seqStorePtr->stats, litLength, (const BYTE*)literals, offsetCode, matchCode); /* debug only */
/* copy Literals */
@ -773,17 +772,17 @@ MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const v
seqStorePtr->lit += litLength;
/* literal Length */
if (litLength>0xFFFF) { seqStorePtr->longLengthID = 1; seqStorePtr->longLengthPos = nbSeq; }
seqStorePtr->sequences[nbSeq].litLength = (U16)litLength;
if (litLength>0xFFFF) { seqStorePtr->longLengthID = 1; seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); }
seqStorePtr->sequences[0].litLength = (U16)litLength;
/* match offset */
seqStorePtr->sequences[nbSeq].offset = offsetCode + 1;
seqStorePtr->sequences[0].offset = offsetCode + 1;
/* match Length */
if (matchCode>0xFFFF) { seqStorePtr->longLengthID = 2; seqStorePtr->longLengthPos = nbSeq; }
seqStorePtr->sequences[nbSeq].matchLength = (U16)matchCode;
if (matchCode>0xFFFF) { seqStorePtr->longLengthID = 2; seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart); }
seqStorePtr->sequences[0].matchLength = (U16)matchCode;
seqStorePtr->nbSeq++;
seqStorePtr->sequences++;
}

2
lib/dictBuilder/zdict.c
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@ -594,7 +594,7 @@ static void ZDICT_countEStats(EStats_ress_t esr, ZSTD_parameters params,
}
/* seqStats */
{ U32 const nbSeq = seqStorePtr->nbSeq;
{ U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
ZSTD_seqToCodes(seqStorePtr);
{ const BYTE* codePtr = seqStorePtr->ofCode;

15
lib/zstd.h
View File

@ -80,16 +80,19 @@ ZSTDLIB_API size_t ZSTD_compress( void* dst, size_t dstCapacity,
/*! ZSTD_getDecompressedSize() :
* @return : decompressed size if known, 0 otherwise.
note 1 : decompressed size could be wrong or intentionally modified !
Always ensure result fits within application's authorized limits !
Each application can set its own limit, depending on local limitations.
For extended interoperability, it is recommended to support at least 8 MB.
note 2 : when `0`, if precise failure cause is needed, use ZSTD_getFrameParams() to know more. */
* note 1 : decompressed size could be wrong or intentionally modified !
* Always ensure result fits within application's authorized limits !
* Each application can set its own limit, depending on local restrictions.
* For extended interoperability, it is recommended to support at least 8 MB.
* note 2 : when `0`, if precise failure cause is needed, use ZSTD_getFrameParams() to know more.
* note 3 : when `0`, and if no external guarantee about maximum possible decompressed size,
* it's necessary to use "streaming mode" to decompress data. */
unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize);
/*! ZSTD_decompress() :
`compressedSize` : must be the _exact_ size of compressed input, otherwise decompression will fail.
`dstCapacity` must be equal or larger than originalSize.
`dstCapacity` must be equal or larger than originalSize (see ZSTD_getDecompressedSize() ).
If maximum possible content size is unknown, use streaming mode to decompress data.
@return : the number of bytes decompressed into `dst` (<= `dstCapacity`),
or an errorCode if it fails (which can be tested using ZSTD_isError()) */
ZSTDLIB_API size_t ZSTD_decompress( void* dst, size_t dstCapacity,