Possibly even smaller decompression func. about lz4gb HOT 1 CLOSED

Nice!

Yeah, LR35902 is fun. :) It's been a while since I coded it, so I don't remember exactly but I think I reversed the order - original compressor saves match distance and length and my modification match length and distance. This was necessary to fit everything within registers and not to use any memory additional push/pops. I probably also shortened offsets to 16 bits vs 32 in original - we don't have that much memory in Game Boy anyway. :)

Actually I also started with 6502 code base. This was to test porting code by using tips from Nintendo docs - nes2gbc.pdf to be exact. I realized quite soon that output is really sloppy and I could achieve better results writing it from scratch. I'm not a 6502 coder anyway. Then I took a peek at Z80 version which uses those fancy instructions not available for LR35902 and ended up with first version. I had couple of different solutions but it was where I started to count cycles and register usage instead of H/RAM. So the final result is a compromise between different approaches and my skills.

from lz4gb.