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improved 4reps in ZSTD_compressBlock_lazy_generic

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kSlotNew = 0
This commit is contained in:
inikep
2016-03-22 11:56:22 +01:00
parent f2fa0e1198
commit 2b942881ac
5 changed files with 26 additions and 19 deletions
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lib/zstd_decompress.c
+9 -2
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@@ -691,19 +691,26 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
}
offset = temp;
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
seqState->prevOffset[0] = offset = temp;
} else {
offset = seqState->prevOffset[0];
}
} else {
offset -= ZSTD_REP_MOVE;
#if 1 // faster without kSlotNew
seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
#else
if (kSlotNew < 3) seqState->prevOffset[3] = seqState->prevOffset[2];
if (kSlotNew < 2) seqState->prevOffset[2] = seqState->prevOffset[1];
if (kSlotNew < 1) seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[kSlotNew] = offset;
#endif
}
#else // ZSTD_REP_NUM == 1
#if 0