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| author | Yann Collet <cyan@fb.com> | 2017-11-09 01:56:20 (GMT) |
|---|---|---|
| committer | Yann Collet <cyan@fb.com> | 2017-11-09 01:56:20 (GMT) |
| commit | dc3ed5b6a7d9cc7d251a1942558e37793d5575b8 (patch) | |
| tree | b10772a2feadfe105e507b570aaa71d40f110ec5 /lib/lz4opt.h | |
| parent | 63f6039fb37bd561c776a1fc4eb04bd9ea46dc83 (diff) | |
| download | lz4-dc3ed5b6a7d9cc7d251a1942558e37793d5575b8.zip lz4-dc3ed5b6a7d9cc7d251a1942558e37793d5575b8.tar.gz lz4-dc3ed5b6a7d9cc7d251a1942558e37793d5575b8.tar.bz2 | |
added code comments
Diffstat (limited to 'lib/lz4opt.h')
| -rw-r--r-- | lib/lz4opt.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/lz4opt.h b/lib/lz4opt.h index 7f74df9..9917851 100644 --- a/lib/lz4opt.h +++ b/lib/lz4opt.h @@ -184,8 +184,13 @@ static int LZ4HC_compress_optimal ( DEBUGLOG(7, "rPos:%u[%u] vs [%u]%u", cur, opt[cur].price, opt[cur+1].price, cur+1); if (fullUpdate) { - if ((opt[cur+1].price <= opt[cur].price) && (opt[cur+MINMATCH].price < opt[cur].price + 3/*min seq price*/)) continue; + /* not useful to search here if next position has same (or lower) cost */ + if ( (opt[cur+1].price <= opt[cur].price) + /* in some cases, next position has same cost, but cost rises sharply after, so a small match would still be beneficial */ + && (opt[cur+MINMATCH].price < opt[cur].price + 3/*min seq price*/) ) + continue; } else { + /* not useful to search here if next position has same (or lower) cost */ if (opt[cur+1].price <= opt[cur].price) continue; } |