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Split non-rep from repmatch candidates

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Emmanuel Marty 2019-11-26 11:58:34 +01:00 committed by GitHub
parent a38e8b126c
commit 0b5e915d83
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 51 additions and 45 deletions
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96
src/shrink_block_v2.c
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@ -334,12 +334,16 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
int nRepOffset = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].rep_offset;
int nCurMaxRepLen = 0;
if (nMatchOffset != nRepOffset &&
nRepOffset &&
i > nRepOffset &&
(i - nRepOffset + nMatchLen) <= (nEndOffset - LAST_LITERALS)) {
while (nCurMaxRepLen < nMatchLen && pInWindow[i - nRepOffset + nCurMaxRepLen] == pInWindow[i - nMatchOffset + nCurMaxRepLen])
nCurMaxRepLen++;
if (nRepOffset) {
if (nMatchOffset == nRepOffset)
nCurMaxRepLen = nMatchLen;
else {
if (i > nRepOffset &&
(i - nRepOffset + nMatchLen) <= (nEndOffset - LAST_LITERALS)) {
while (nCurMaxRepLen < nMatchLen && pInWindow[i - nRepOffset + nCurMaxRepLen] == pInWindow[i - nMatchOffset + nCurMaxRepLen])
nCurMaxRepLen++;
}
}
}
nMaxRepLen[j] = nCurMaxRepLen;
@ -365,52 +369,54 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
if (nRepCodingChoiceCost <= pDestSlots[nMatchesPerArrival - 1].cost) {
int nRepOffset = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].rep_offset;
int nMatchOffsetCost = (nMatchOffset == nRepOffset) ? 0 : nNoRepmatchOffsetCost;
int nCodingChoiceCost = nRepCodingChoiceCost + nMatchOffsetCost;
if (!nFavorRatio && !arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].num_literals)
nCodingChoiceCost += MODESWITCH_PENALTY;
if (nMatchOffset != nRepOffset) {
int nCodingChoiceCost = nRepCodingChoiceCost + nNoRepmatchOffsetCost;
if (nCodingChoiceCost <= pDestSlots[nMatchesPerArrival - 1].cost) {
int exists = 0;
int nScore = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].score + ((nMatchOffset == nRepOffset) ? 2 : 3);
if (!nFavorRatio && !arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].num_literals)
nCodingChoiceCost += MODESWITCH_PENALTY;
for (n = 0;
n < nMatchesPerArrival && pDestSlots[n].cost <= nCodingChoiceCost;
n++) {
if (pDestSlots[n].rep_offset == nMatchOffset &&
(!nInsertForwardReps || pDestSlots[n].cost != nCodingChoiceCost || pDestSlots[n].rep_pos >= i || nScore >= (pDestSlots[n].score + nDisableScore) ||
pDestSlots[nMatchesPerArrival - 1].from_slot)) {
exists = 1;
break;
}
}
if (nCodingChoiceCost <= pDestSlots[nMatchesPerArrival - 1].cost) {
int exists = 0;
int nScore = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].score + 3;
if (!exists) {
for (n = 0; n < nMatchesPerArrival; n++) {
lzsa_arrival *pDestArrival = &pDestSlots[n];
if (nCodingChoiceCost < pDestArrival->cost ||
(nCodingChoiceCost == pDestArrival->cost && nScore < (pDestArrival->score + nDisableScore))) {
if (pDestArrival->from_slot) {
memmove(&pDestSlots[n + 1],
&pDestSlots[n],
sizeof(lzsa_arrival) * (nMatchesPerArrival - n - 1));
}
pDestArrival->cost = nCodingChoiceCost;
pDestArrival->from_pos = i;
pDestArrival->from_slot = j + 1;
pDestArrival->match_offset = nMatchOffset;
pDestArrival->match_len = k;
pDestArrival->num_literals = 0;
pDestArrival->score = nScore;
pDestArrival->rep_offset = nMatchOffset;
pDestArrival->rep_pos = i;
pDestArrival->rep_len = k;
for (n = 0;
n < nMatchesPerArrival && pDestSlots[n].cost <= nCodingChoiceCost;
n++) {
if (pDestSlots[n].rep_offset == nMatchOffset &&
(!nInsertForwardReps || pDestSlots[n].cost != nCodingChoiceCost || pDestSlots[n].rep_pos >= i || nScore >= (pDestSlots[n].score + nDisableScore) ||
pDestSlots[nMatchesPerArrival - 1].from_slot)) {
exists = 1;
break;
}
}
if (!exists) {
for (n = 0; n < nMatchesPerArrival; n++) {
lzsa_arrival *pDestArrival = &pDestSlots[n];
if (nCodingChoiceCost < pDestArrival->cost ||
(nCodingChoiceCost == pDestArrival->cost && nScore < (pDestArrival->score + nDisableScore))) {
if (pDestArrival->from_slot) {
memmove(&pDestSlots[n + 1],
&pDestSlots[n],
sizeof(lzsa_arrival) * (nMatchesPerArrival - n - 1));
}
pDestArrival->cost = nCodingChoiceCost;
pDestArrival->from_pos = i;
pDestArrival->from_slot = j + 1;
pDestArrival->match_offset = nMatchOffset;
pDestArrival->match_len = k;
pDestArrival->num_literals = 0;
pDestArrival->score = nScore;
pDestArrival->rep_offset = nMatchOffset;
pDestArrival->rep_pos = i;
pDestArrival->rep_len = k;
break;
}
}
}
}
}