6502/lzsa
1
0
Fork 0
mirror of https://github.com/emmanuel-marty/lzsa.git synced 2024-06-14 14:29:30 +00:00
Code Issues Projects Releases Wiki Activity

Small LZSA2 compression speedup

Browse Source
This commit is contained in:
Emmanuel Marty 2019-11-20 15:40:11 +01:00 committed by GitHub
parent 5f4cf4dfc7
commit a38e8b126c
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/shrink_block_v2.c
View File

@ -361,16 +361,16 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
for (j = 0; j < nMatchesPerArrival && arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].from_slot; j++) {
const int nPrevCost = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].cost & 0x3fffffff;
int nRepOffset = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].rep_offset;
int nMatchOffsetCost = (nMatchOffset == nRepOffset) ? 0 : nNoRepmatchOffsetCost;
int nRepCodingChoiceCost = nPrevCost + 8 /* token */ /* the actual cost of the literals themselves accumulates up the chain */ + nMatchLenCost;
int nCodingChoiceCost = nRepCodingChoiceCost + nMatchOffsetCost;
if (!nFavorRatio && !arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].num_literals)
nCodingChoiceCost += MODESWITCH_PENALTY;
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 (nCodingChoiceCost <= pDestSlots[nMatchesPerArrival - 1].cost) {
int exists = 0;
int nScore = arrival[(i << MATCHES_PER_ARRIVAL_SHIFT) + j].score + ((nMatchOffset == nRepOffset) ? 2 : 3);

4
src/shrink_context.h
View File

@ -75,10 +75,10 @@ typedef struct _lzsa_match {
/** Forward arrival slot */
typedef struct {
int cost;
int from_pos;
unsigned short rep_offset;
short from_slot;
unsigned short rep_offset;
int from_pos;
unsigned short rep_len;
int rep_pos;
int num_literals;