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improved decompression speed (680)

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This commit is contained in:
Yann Collet 2016-03-25 11:43:48 +01:00
parent 646693e3be
commit 433a5cce7e
2 changed files with 10 additions and 10 deletions
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6
lib/zstd_compress.c
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@ -798,9 +798,9 @@ MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const B
static const BYTE* g_start = NULL; static const BYTE* g_start = NULL;
const U32 pos = (U32)(literals - g_start); const U32 pos = (U32)(literals - g_start);
if (g_start==NULL) g_start = literals; if (g_start==NULL) g_start = literals;
if ((pos > 23945000) && (pos < 23946800)) if ((pos > 15181500) && (pos < 15183150))
printf("Cpos %6u :%4u literals & match %3u bytes at distance %6u \n", printf("Cpos %6u :%4u literals & match %3u bytes at distance %6u \n",
pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode); pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode);
#endif #endif
#if ZSTD_OPT_DEBUG == 3 #if ZSTD_OPT_DEBUG == 3
if (offsetCode == 0) seqStorePtr->realRepSum++; if (offsetCode == 0) seqStorePtr->realRepSum++;

14
lib/zstd_decompress.c
View File

@ -637,9 +637,7 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
U32 const ofBits = ofCode; U32 const ofBits = ofCode;
U32 const totalBits = llBits+mlBits+ofBits; U32 const totalBits = llBits+mlBits+ofBits;
size_t const allBits = BIT_readBits(&(seqState->DStream), totalBits); //size_t const allBits = BIT_readBits(&(seqState->DStream), totalBits);
if (totalBits > 64 - 7 - (LLFSELog+MLFSELog+OffFSELog)) BIT_reloadDStream(&(seqState->DStream));
static const U32 LL_base[MaxLL+1] = { static const U32 LL_base[MaxLL+1] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
@ -659,13 +657,15 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, /*fake*/ 1, 1, 1, 1, 1 }; 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, /*fake*/ 1, 1, 1, 1, 1 };
/* sequence */ /* sequence */
seq->litLength = LL_base[llCode] + BIT_getLowerBits(allBits, llBits); { size_t const offset = ofCode ? OF_base[ofCode] + BIT_readBits(&(seqState->DStream), ofBits) :
seq->matchLength = ML_base[mlCode] + mls + BIT_getMiddleBits(allBits, mlBits, llBits);
{ size_t const offset = ofCode ? OF_base[ofCode] + BIT_getUpperBits(allBits, llBits+mlBits) :
llCode ? seq->offset : seqState->prevOffset; llCode ? seq->offset : seqState->prevOffset;
if (ofCode | !llCode) seqState->prevOffset = seq->offset; /* cmove */ if (ofCode | !llCode) seqState->prevOffset = seq->offset; /* cmove */
seq->offset = offset; seq->offset = offset;
} }
seq->matchLength = ML_base[mlCode] + mls + ((mlCode>31) ? BIT_readBits(&(seqState->DStream), mlBits) : 0);
seq->litLength = LL_base[llCode] + ((llCode>15) ? BIT_readBits(&(seqState->DStream), llBits) : 0);
if (totalBits > 64 - 7 - (LLFSELog+MLFSELog+OffFSELog)) BIT_reloadDStream(&(seqState->DStream));
/* ANS state update */ /* ANS state update */
FSE_updateState(&(seqState->stateLL), &(seqState->DStream)); FSE_updateState(&(seqState->stateLL), &(seqState->DStream));
@ -795,7 +795,7 @@ static size_t ZSTD_decompressSequences(
ZSTD_decodeSequence(&sequence, &seqState, mls); ZSTD_decodeSequence(&sequence, &seqState, mls);
#if 0 /* for debug */ #if 0 /* for debug */
{ U32 pos = (U32)(op-base); { U32 pos = (U32)(op-base);
if ((pos > 23945280) && (pos < 23946797)) if ((pos > 15181500) && (pos < 15183150))
printf("Dpos %6u : %3u literals & match %3u bytes at distance %6u \n", printf("Dpos %6u : %3u literals & match %3u bytes at distance %6u \n",
pos, (U32)sequence.litLength, (U32)sequence.matchLength, (U32)sequence.offset); pos, (U32)sequence.litLength, (U32)sequence.matchLength, (U32)sequence.offset);
} }