Directory overview: =================== As writing portable assembler sources supporting different operating systems, compilers and assemblers has proven to be extremely painful, the assembler sources have been converted into a more portable 'db' format. Use these whenever possible. src_gas sources converted for portable gcc/gas syntax src_masm sources converted for portable masm/tasm/wasm syntax src_nasm sources converted for portable nasm syntax src assembler sources (you need the OpenSource nasm assembler) obj pre-assembled object files Also look 'src_XXX/all/asm_all.asm' which contains all assembler functions conveniently arranged into a single file. Notes: ====== - The assembler sources are designed for a flat 32-bit memory model running in protected mode - they should work with all i386 32-bit compilers around. - All functions expect a 'cdecl' (C stack based) calling convention. The function return value will be placed into 'eax'. All other registers are preserved. - Prototypes for the assembler functions can be found in <lzo/lzo_asm.h>. - For reasons of speed all fast assembler decompressors (having '_fast' in their name) can access (write to) up to 3 bytes past the end of the decompressed (output) block. Data past the end of the compressed (input) block is never accessed (read from). [ technical note: because data is transferred in 32-bit units ] - Finally you should test if the assembler versions are actually faster than the C version on your machine - some compilers can do a very good optimization job, and they also can optimize the code for a specific processor type.