zstd/compress at 42c1e642704c2c4d1f402296376b59393c25ca1c - zstd

mirror of https://github.com/facebook/zstd.git synced 2025-10-09 00:05:28 -04:00

History

Yann Collet 42c1e64270 slightly improved ratio at -22

merging of repcode search into btsearch introduced a small compression ratio regressio at max level :
1.3.2 : 52728769
after repMerge patch : 52760789 (+32020)

A few minor changes have produced this difference.
They can be hard to spot.

This patch buys back about half of the difference,
by no longer inserting position at hc3 when a long match is found there.
It feels strangely counter-intuitive, but works :
after this patch : 52742555 (-18234)

2017-11-19 14:00:55 -08:00

fse_compress.c

[zstd] Backport kernel patch from @ColinIanKing

2017-09-25 16:18:23 -07:00

huf_compress.c

Ensure dictionary Huff table can encode any symbol

2017-10-03 13:22:13 -07:00

zstd_compress_internal.h

zstd_opt: minor speed optimization

2017-11-18 16:24:02 -08:00

zstd_compress.c

fix one UB pointer arithmetic in encoder