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improved decoding speed (660)

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This commit is contained in:
Yann Collet
2016-03-23 13:57:49 +01:00
parent fd69225086
commit afab02098a
2 changed files with 15 additions and 5 deletions
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lib/zstd_decompress.c
+5 -3
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@@ -652,16 +652,18 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
0x8000, 0x10000, 0x20000, 0x40000, 0x80000, 0x100000, 0x200000, 0x400000,
0x800000, 0x1000000, 0x2000000, 0x4000000, /*fake*/ 1, 1, 1, 1 };
seq->litLength = LL_base[llCode] + BIT_readBits(&(seqState->DStream), llBits);
seq->matchLength = ML_base[mlCode] + BIT_readBits(&(seqState->DStream), mlBits) + mls;
size_t allBits = BIT_readBits(&(seqState->DStream), llBits+mlBits+ofBits);
/* Offset */
{ size_t const offset = ofCode ? OF_base[ofCode] + BIT_readBits(&(seqState->DStream), ofBits) :
{ size_t const offset = ofCode ? OF_base[ofCode] + BIT_consumeFirstBits(&allBits, ofBits) :
llCode ? seq->offset : seqState->prevOffset;
if (ofCode | !llCode) seqState->prevOffset = seq->offset; /* cmove */
seq->offset = offset;
}
seq->matchLength = ML_base[mlCode] + BIT_consumeFirstBits(&allBits, mlBits) + mls;
seq->litLength = LL_base[llCode] + BIT_consumeFirstBits(&allBits, llBits);
/* ANS state update */
FSE_updateState(&(seqState->stateLL), &(seqState->DStream));
FSE_updateState(&(seqState->stateML), &(seqState->DStream));