mobygamer
c38b582e73
Time-efficient LZSA2 decompressor
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This commit provides a time-effecient LZSA2 decompressor for
the 8088 (and higher) CPU. Decompression speed is roughly 50% faster
than ZX7 on the same hardware.
2019-07-13 22:35:28 -05:00
mobygamer
f123a6d9df
Submit 8086-optimized decompressor using jump tables
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Because the 8086's BIU is more efficient and can read a word in
a single operation, we can skew LZSA1 decompression faster on 8086
by using a jump table to eliminate 2 comparions.
2019-07-11 17:22:29 -05:00
mobygamer
638c33b432
Additional minor speedups
2019-07-11 00:58:46 -05:00
mobygamer
9a180a59f9
Additional 1% speedup from to introspec suggestions
2019-07-09 13:05:10 -05:00
mobygamer
b0c9d61aab
8088-speed-optimized LZSA1 decompression
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This commit contributes LZSA1 raw block format decompression code,
optimized for speed for the 8088 and higher processors. With
appropriate compression options (-f1 -m5), decompression speed is
comparable to LZ4.
2019-07-07 20:25:50 -05:00
Emmanuel Marty
8d8f50a509
Don't use 80186 opcodes. Issue #3
2019-06-27 18:32:49 +02:00
Emmanuel Marty
79ed7bf91e
Further update LZSA2 format; avoid name conflicts
2019-06-08 13:35:03 +02:00
Emmanuel Marty
272f2e7a29
Update LZSA2 6502 and 8088 depackers
2019-06-07 23:22:34 +02:00
emmanuel-marty
d70830b525
Simplify nibble handling in LZSA2 8088 depacker
2019-05-11 11:42:00 +02:00
emmanuel-marty
8b7b4a2b4f
Check in LZSA2 implementation (ratio competitive with ZX7, faster decompression)
2019-05-09 16:51:29 +02:00
emmanuel-marty
2b9780bd65
Finalize lzsa1 compressed format, speed up and simplify decompression
2019-04-24 09:47:40 +02:00
emmanuel-marty
02592cfe3b
Fix typo in 8088 decompressor comments
2019-04-10 17:30:13 +02:00
emmanuel-marty
e24320b23b
Save 1 byte in 8088 decompressor
2019-04-06 00:21:15 +02:00
emmanuel-marty
a785010448
Revert token to O|LLL|MMMM; revert to always shifting the match offset by 1; set raw block end marker as a large zero-size match
2019-04-05 23:16:05 +02:00
emmanuel-marty
1ef1ad8111
Reorganize token byte for faster decoding on 8-bit CPUs, without affecting the compression ratio
2019-04-05 11:58:44 +02:00
emmanuel-marty
c7692cf688
Store 16-bit lengths and match offsets directly, to simplify decompression on 8-bit CPUs without affecting the compression ratio
2019-04-05 10:42:06 +02:00
emmanuel-marty
0744ec99de
Unpack raw blocks in 8088 decompressor
2019-04-03 13:05:32 +02:00
emmanuel-marty
06396f5ba6
Save 2 bytes in 8088 decompressor
2019-04-02 13:21:45 +02:00
marty-emmanuel
e216b0c544
Initial checkin
2019-04-01 18:04:56 +02:00
