AuroraMiddleware/lz4
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fixed SC.opt integration with regular HC parser

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Only enabled when searching forward.

note : it slighly improves compression ratio,
but measurably decreases speed.
Trade-off to analyse.
This commit is contained in:
Yann Collet 2018-05-05 13:46:45 -07:00
parent fa89a9e18b
commit d097bf93f8
1 changed files with 4 additions and 4 deletions
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8
lib/lz4hc.c
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@ -280,9 +280,9 @@ LZ4HC_InsertAndGetWiderMatch (
*startpos = ip + back;
} } }
if (mlt == longest) { /* better match => select a better chain */
assert(longest >= MINMATCH);
if (1 && matchIndex + longest <= ipIndex) {
if ( lookBackLength==0 /* search forward only */
&& mlt==longest) { /* better match => select a better chain */
if (matchIndex + longest <= ipIndex) {
U32 distanceToNextMatch = 1;
int pos;
for (pos = 0; pos <= longest - MINMATCH; pos++) {
@ -301,7 +301,7 @@ LZ4HC_InsertAndGetWiderMatch (
}
{ U32 const distNextMatch = DELTANEXTU16(chainTable, matchIndex);
if (1 && patternAnalysis && distNextMatch==1 && matchChainPos==0) {
if (patternAnalysis && distNextMatch==1 && matchChainPos==0) {
U32 const matchCandidateIdx = matchIndex-1;
/* may be a repeated pattern */
if (repeat == rep_untested) {