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introduced U32 rep[ZSTD_REP_NUM]

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This commit is contained in:
inikep 2016-03-16 11:56:59 +01:00
parent 4569667c85
commit df164e6d35
1 changed files with 51 additions and 45 deletions
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96
lib/zstd_opt.h
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@ -409,7 +409,6 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
const BYTE* const base = ctx->base;
const BYTE* const prefixStart = base + ctx->dictLimit;
U32 rep_2=REPCODE_STARTVALUE, rep_1=REPCODE_STARTVALUE;
const U32 maxSearches = 1U << ctx->params.searchLog;
const U32 sufficient_len = ctx->params.targetLength;
const U32 mls = ctx->params.searchLength;
@ -421,6 +420,10 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
U32 cur, match_num, last_pos, litlen, price;
/* init */
U32 rep[ZSTD_REP_NUM];
for (int i=0; i<ZSTD_REP_NUM; i++)
rep[i]=REPCODE_STARTVALUE;
ctx->nextToUpdate3 = ctx->nextToUpdate;
ZSTD_resetSeqStore(seqStorePtr);
ZSTD_rescaleFreqs(seqStorePtr);
@ -441,11 +444,11 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
opt[0].litlen = (U32)(ip - litstart);
/* check repCode */
if (MEM_readMINMATCH(ip+1, minMatch) == MEM_readMINMATCH(ip+1 - rep_1, minMatch)) {
if (MEM_readMINMATCH(ip+1, minMatch) == MEM_readMINMATCH(ip+1 - rep[0], minMatch)) {
/* repcode : we take it */
mlen = (U32)ZSTD_count(ip+1+minMatch, ip+1+minMatch-rep_1, iend) + minMatch;
mlen = (U32)ZSTD_count(ip+1+minMatch, ip+1+minMatch-rep[0], iend) + minMatch;
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep_1, (int)mlen);
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep[0], (int)mlen);
if (depth==0 || mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
ip+=1; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
goto _storeSequence;
@ -465,8 +468,8 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
if (!last_pos && !match_num) { ip++; continue; }
opt[0].rep = rep_1;
opt[0].rep2 = rep_2;
opt[0].rep = rep[0];
opt[0].rep2 = rep[1];
opt[0].mlen = 1;
if (match_num && matches[match_num-1].len > sufficient_len) {
@ -656,26 +659,26 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
cur += mlen;
U32 litLength = (U32)(ip - anchor);
ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep_1, (int)rep_2);
ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]);
if (offset) {
rep_2 = rep_1;
rep_1 = offset;
rep[1] = rep[0];
rep[0] = offset;
} else {
if (litLength == 0) {
best_off = rep_2;
rep_2 = rep_1;
rep_1 = best_off;
best_off = rep[1];
rep[1] = rep[0];
rep[0] = best_off;
} }
// ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep_1, (int)rep_2);
// ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[1], (int)rep_2);
#if ZSTD_OPT_DEBUG >= 5
U32 ml2;
if (offset)
ml2 = (U32)ZSTD_count(ip, ip-offset, iend);
else
ml2 = (U32)ZSTD_count(ip, ip-rep_1, iend);
ml2 = (U32)ZSTD_count(ip, ip-rep[0], iend);
if ((offset >= 8) && (ml2 < mlen || ml2 < minMatch)) {
printf("%d: ERROR_NoExt iend=%d mlen=%d offset=%d ml2=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset, (int)ml2); exit(0); }
if (ip < anchor) {
@ -690,14 +693,14 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
} /* for (cur=0; cur < last_pos; ) */
/* check immediate repcode */
while ((anchor >= prefixStart + rep_2) && (anchor <= ilimit)
&& (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(anchor - rep_2, minMatch)) ) {
while ((anchor >= prefixStart + rep[1]) && (anchor <= ilimit)
&& (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(anchor - rep[1], minMatch)) ) {
/* store sequence */
best_mlen = (U32)ZSTD_count(anchor+minMatch, anchor+minMatch-rep_2, iend);
best_off = rep_2;
rep_2 = rep_1;
rep_1 = best_off;
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep_1, (int)rep_2);
best_mlen = (U32)ZSTD_count(anchor+minMatch, anchor+minMatch-rep[1], iend);
best_off = rep[1];
rep[1] = rep[0];
rep[0] = best_off;
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep[0], (int)rep[1]);
ZSTD_updatePrice(seqStorePtr, 0, anchor, 0, best_mlen);
ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, best_mlen);
anchor += best_mlen+minMatch;
@ -734,7 +737,6 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
const BYTE* const dictEnd = dictBase + dictLimit;
const U32 lowLimit = ctx->lowLimit;
U32 rep_2=REPCODE_STARTVALUE, rep_1=REPCODE_STARTVALUE;
const U32 maxSearches = 1U << ctx->params.searchLog;
const U32 sufficient_len = ctx->params.targetLength;
const U32 mls = ctx->params.searchLength;
@ -746,6 +748,10 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
U32 cur, match_num, last_pos, litlen, price;
/* init */
U32 rep[ZSTD_REP_NUM];
for (int i=0; i<ZSTD_REP_NUM; i++)
rep[i]=REPCODE_STARTVALUE;
ctx->nextToUpdate3 = ctx->nextToUpdate;
ZSTD_resetSeqStore(seqStorePtr);
ZSTD_rescaleFreqs(seqStorePtr);
@ -766,7 +772,7 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
/* check repCode */
{
const U32 repIndex = (U32)(current+1 - rep_1);
const U32 repIndex = (U32)(current+1 - rep[0]);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
@ -775,7 +781,7 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
mlen = (U32)ZSTD_count_2segments(ip+1+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch;
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep_1, (int)mlen);
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep[0], (int)mlen);
if (depth==0 || mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
ip+=1; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
goto _storeSequence;
@ -797,8 +803,8 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
if (!last_pos && !match_num) { ip++; continue; }
opt[0].rep = rep_1;
opt[0].rep2 = rep_2;
opt[0].rep = rep[0];
opt[0].rep2 = rep[1];
opt[0].mlen = 1;
if (match_num && matches[match_num-1].len > sufficient_len) {
@ -996,19 +1002,19 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
cur += mlen;
litLength = (U32)(ip - anchor);
ZSTD_LOG_ENCODE("%d/%d: ENCODE1 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep_1, (int)rep_2);
ZSTD_LOG_ENCODE("%d/%d: ENCODE1 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]);
if (offset) {
rep_2 = rep_1;
rep_1 = offset;
rep[1] = rep[0];
rep[0] = offset;
} else {
if (litLength == 0) {
best_off = rep_2;
rep_2 = rep_1;
rep_1 = best_off;
best_off = rep[1];
rep[1] = rep[0];
rep[0] = best_off;
} }
ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep_1, (int)rep_2);
ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]);
#if ZSTD_OPT_DEBUG >= 5
U32 ml2;
@ -1020,7 +1026,7 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
}
else ml2 = (U32)ZSTD_count(ip, ip-offset, iend);
}
else ml2 = (U32)ZSTD_count(ip, ip-rep_1, iend);
else ml2 = (U32)ZSTD_count(ip, ip-rep[0], iend);
if ((offset >= 8) && (ml2 < mlen || ml2 < minMatch)) {
printf("%d: ERROR_Ext iend=%d mlen=%d offset=%d ml2=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset, (int)ml2); exit(0); }
if (ip < anchor) {
@ -1036,22 +1042,22 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
#if 0
/* check immediate repcode */
while ((anchor >= base + lowLimit + rep_2) && (anchor <= ilimit)) {
if ((anchor - rep_2) >= prefixStart) {
if (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(anchor - rep_2, minMatch))
mlen = (U32)ZSTD_count(anchor+minMatch, anchor - rep_2 + minMatch, iend) + minMatch;
while ((anchor >= base + lowLimit + rep[1]) && (anchor <= ilimit)) {
if ((anchor - rep[1]) >= prefixStart) {
if (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(anchor - rep[1], minMatch))
mlen = (U32)ZSTD_count(anchor+minMatch, anchor - rep[1] + minMatch, iend) + minMatch;
else
break;
} else {
const BYTE* repMatch = dictBase + ((anchor-base) - rep_2);
const BYTE* repMatch = dictBase + ((anchor-base) - rep[1]);
if ((repMatch + minMatch <= dictEnd) && (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(repMatch, minMatch)))
mlen = (U32)ZSTD_count_2segments(anchor+minMatch, repMatch+minMatch, iend, dictEnd, prefixStart) + minMatch;
else
break;
}
offset = rep_2; rep_2 = rep_1; rep_1 = offset; /* swap offset history */
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep_1, (int)rep_2);
offset = rep[1]; rep[1] = rep[0]; rep[0] = offset; /* swap offset history */
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep[0], (int)rep[1]);
ZSTD_updatePrice(seqStorePtr, 0, anchor, 0, mlen-minMatch);
ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, mlen-minMatch);
anchor += mlen;
@ -1059,8 +1065,8 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
#else
/* check immediate repcode */
/* minimal correctness condition = while ((anchor >= prefixStart + REPCODE_STARTVALUE) && (anchor <= ilimit)) { */
while ((anchor >= base + lowLimit + rep_2) && (anchor <= ilimit)) {
const U32 repIndex = (U32)((anchor-base) - rep_2);
while ((anchor >= base + lowLimit + rep[1]) && (anchor <= ilimit)) {
const U32 repIndex = (U32)((anchor-base) - rep[1]);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
@ -1068,8 +1074,8 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
/* repcode detected, let's take it */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
mlen = (U32)ZSTD_count_2segments(anchor+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch;
offset = rep_2; rep_2 = rep_1; rep_1 = offset; /* swap offset history */
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep_1, (int)rep_2);
offset = rep[1]; rep[1] = rep[0]; rep[0] = offset; /* swap offset history */
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep[0], (int)rep[1]);
ZSTD_updatePrice(seqStorePtr, 0, anchor, 0, mlen-minMatch);
ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, mlen-minMatch);
anchor += mlen;