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support for ZSTD_REP_NUM=3

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This commit is contained in:
inikep
2016-04-05 10:30:05 +02:00
parent 74e3a7ba4c
commit ba73d1bb6b
4 changed files with 38 additions and 83 deletions
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lib/zstd_compress.c
+5 -6
View File
@@ -1736,16 +1736,19 @@ void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx,
/* store sequence */
_storeSequence:
{
#if ZSTD_REP_NUM == 4
if (offset >= ZSTD_REP_NUM) {
#if ZSTD_REP_NUM > 3
rep[3] = rep[2];
#endif
rep[2] = rep[1];
rep[1] = rep[0];
rep[0] = offset - ZSTD_REP_MOVE;
} else {
if (offset != 0) {
size_t temp = rep[offset];
#if ZSTD_REP_NUM > 3
if (offset > 2) rep[3] = rep[2];
#endif
if (offset > 1) rep[2] = rep[1];
if (offset > 0) rep[1] = rep[0];
rep[0] = temp;
@@ -1753,11 +1756,7 @@ _storeSequence:
if (offset<=1 && start==anchor) offset = 1-offset;
}
#else
if (offset >= ZSTD_REP_NUM) {
rep[1] = rep[0]; rep[0] = offset - ZSTD_REP_MOVE;
}
#endif
size_t const litLength = start - anchor;
ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, matchLength-MINMATCH);
lib/zstd_decompress.c
+21 -68
View File
@@ -656,51 +656,7 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, /*fake*/ 1, 1, 1, 1, 1 };
/* sequence */
#if ZSTD_REP_NUM == 1
#if 1
{ size_t const offset = ofCode ? OF_base[ofCode] + BIT_readBits(&(seqState->DStream), ofBits) - ZSTD_REP_MOVE : /* <= 26 bits */
llCode ? seq->offset : seqState->prevOffset[0];
if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
if (ofCode | !llCode) seqState->prevOffset[0] = seq->offset; /* cmove */
seq->offset = offset;
}
#else
{ size_t offset;
if (ofCode) {
offset = OF_base[ofCode] + BIT_readBits(&(seqState->DStream), ofBits) - ZSTD_REP_MOVE; /* <= 26 bits */
if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
seqState->prevOffset[0] = seq->offset; /* cmove */
} else {
if (llCode) {
offset = seq->offset;
} else {
offset = seqState->prevOffset[0];
seqState->prevOffset[0] = seq->offset;
}
}
seq->offset = offset;
}
#endif
#else // ZSTD_REP_NUM == 1
{ size_t offset;
#if 0
if (!ofCode) {
if (!llCode) {
offset = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
} else {
offset = seqState->prevOffset[0];
}
} else {
offset = OF_base[ofCode] + BIT_readBits(&(seqState->DStream), ofBits); /* <= 26 bits */
if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
#else
if (!ofCode)
offset = 0;
else {
@@ -708,37 +664,34 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
}
{
if (offset < ZSTD_REP_NUM) {
if (llCode == 0 && offset <= 1) offset = 1-offset;
if (offset != 0) {
size_t temp = seqState->prevOffset[offset];
if (offset != 1) {
#if ZSTD_REP_NUM > 3
if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2];
#endif
if (offset < ZSTD_REP_NUM) {
if (llCode == 0 && offset <= 1) offset = 1-offset;
if (offset != 0) {
size_t temp = seqState->prevOffset[offset];
if (offset != 1) {
if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
}
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset = temp;
} else {
offset = seqState->prevOffset[0];
seqState->prevOffset[2] = seqState->prevOffset[1];
}
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset = temp;
} else {
offset -= ZSTD_REP_MOVE;
seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
offset = seqState->prevOffset[0];
}
} else {
offset -= ZSTD_REP_MOVE;
#if ZSTD_REP_NUM > 3
seqState->prevOffset[3] = seqState->prevOffset[2];
#endif
seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
}
seq->offset = offset;
}
#endif
seq->matchLength = ML_base[mlCode] + mls + ((mlCode>31) ? BIT_readBits(&(seqState->DStream), mlBits) : 0); /* <= 16 bits */
if (MEM_32bits() && (mlBits+llBits>24)) BIT_reloadDStream(&(seqState->DStream));
lib/zstd_internal.h
+4 -9
View File
@@ -64,15 +64,10 @@
#define ZSTD_OPT_NUM (1<<12)
#define ZSTD_DICT_MAGIC 0xEC30A435
#if 1
#define ZSTD_REP_NUM 4
#define ZSTD_REP_INIT 4
#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
#else
#define ZSTD_REP_NUM 1
#define ZSTD_REP_INIT 2
#define ZSTD_REP_MOVE 0 //(ZSTD_REP_NUM-1)
#endif
#define ZSTD_REP_NUM 3
#define ZSTD_REP_INIT ZSTD_REP_NUM
#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
#define KB *(1 <<10)
#define MB *(1 <<20)
lib/zstd_opt.h
+8
View File
@@ -551,13 +551,17 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
mlen = opt[cur].mlen;
if (opt[cur].off >= ZSTD_REP_NUM) {
#if ZSTD_REP_NUM > 3
opt[cur].rep[3] = opt[cur-mlen].rep[2];
#endif
opt[cur].rep[2] = opt[cur-mlen].rep[1];
opt[cur].rep[1] = opt[cur-mlen].rep[0];
opt[cur].rep[0] = opt[cur].off - ZSTD_REP_MOVE;
ZSTD_LOG_ENCODE("%d: COPYREP_OFF cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
} else {
#if ZSTD_REP_NUM > 3
opt[cur].rep[3] = (opt[cur].off > 2) ? opt[cur-mlen].rep[2] : opt[cur-mlen].rep[3];
#endif
opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2];
opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1];
opt[cur].rep[0] = opt[cur-mlen].rep[opt[cur].off];
@@ -684,7 +688,9 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d mlen=%d off=%d rep1=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]);
if (offset >= ZSTD_REP_NUM) {
#if ZSTD_REP_NUM > 3
rep[3] = rep[2];
#endif
rep[2] = rep[1];
rep[1] = rep[0];
rep[0] = offset - ZSTD_REP_MOVE;
@@ -692,7 +698,9 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
if (offset != 0) {
size_t temp = rep[offset];
if (offset != 1) {
#if ZSTD_REP_NUM > 3
if (offset == 3) rep[3] = rep[2];
#endif
rep[2] = rep[1];
}
rep[1] = rep[0];